MySQL/MariaDB数据库的服务器配置
作者：尹正杰
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一.MySQL中的系统数据库
1>.mysql数据库
是mysql的核心数据库，类似于Sql Server中的master库，主要负责存储数据库的用户、权限设置、关键字等mysql自己需要使用的控制和管理信息
2>.performance_schema数据库
MySQL 5.5开始新增的数据库，主要用于收集数据库服务器性能参数,库里表的存储引擎均为PERFORMANCE_SCHEMA，用户不能创建存储引擎为PERFORMANCE_SCHEMA的表
3>.information_schema数据库
MySQL 5.0之后产生的，一个虚拟数据库，物理上并不存在information_schema数据库类似与“数据字典”，提供了访问数据库元数据的方式，即数据的数据。比如数据库名或表名，列类型，访问权限（更加细化的访问方式）
二.服务器端设置
1>.服务器配置
服务器配置包括mysqld选项，服务器系统变量和服务器状态变量; 其中有些参数支持运行时修改，会立即生效；有些参数不支持，且只能通过修改配置文件，并重启服务器程序生效；有些参数作用域是全局的，且不可改变；有些可以为每个用户提供单独（会话）的设置 博主推荐阅读:
https://dev.mysql.com/doc/refman/5.7/en/server-option-variable-reference.html https://mariadb.com/kb/en/library/full-list-of-mariadb-options-system-and-status-variables/
2>.获取mysqld的可用选项列表
[root@node105.yinzhengjie.org.cn ~]# mysqld --help --verbose | more 2019-10-29 14:05:56 140578381952832 [Warning] 'THREAD_CONCURRENCY' is deprecated and will be removed in a future release. 2019-10-29 14:05:56 140578381952832 [Note] Plugin 'FEEDBACK' is disabled. mysqld Ver 10.2.19-MariaDB-log for Linux on x86_64 (MariaDB Server) Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others. Starts the MariaDB database server. Usage: mysqld [OPTIONS] Default options are read from the following files in the given order: /etc/my.cnf /etc/mysql/my.cnf ~/.my.cnf The following groups are read: mysqld server mysqld-10.2 mariadb mariadb-10.2 client-server galera The following options may be given as the first argument: --print-defaults Print the program argument list and exit. --no-defaults Don't read default options from any option file. The following specify which files/extra groups are read (specified before remaining options): --defaults-file=# Only read default options from the given file #. --defaults-extra-file=# Read this file after the global files are read. --defaults-group-suffix=# Additionally read default groups with # appended as a suffix. --allow-suspicious-udfs Allows use of UDFs consisting of only one symbol xxx() without corresponding xxx_init() or xxx_deinit(). That also means that one can load any function from any library, for example exit() from libc.so -a, --ansi Use ANSI SQL syntax instead of MySQL syntax. This mode will also set transaction isolation level 'serializable'. --aria[=name] Enable or disable Aria plugin. One of: ON, OFF, FORCE (don't start if the plugin fails to load). --aria-block-size=# Block size to be used for Aria index pages. --aria-checkpoint-interval=# Interval between tries to do an automatic checkpoints. In seconds; 0 means 'no automatic checkpoints' which makes sense only for testing. --aria-checkpoint-log-activity=# Number of bytes that the transaction log has to grow between checkpoints before a new checkpoint is written to the log. --aria-encrypt-tables Encrypt tables (only for tables with ROW_FORMAT=PAGE (default) and not FIXED/DYNAMIC) --aria-force-start-after-recovery-failures=# Number of consecutive log recovery failures after which logs will be automatically deleted to cure the problem; 0 (the default) disables the feature. --aria-group-commit=name Specifies Aria group commit mode. Possible values are "none" (no group commit), "hard" (with waiting to actual commit), "soft" (no wait for commit (DANGEROUS!!!)) --aria-group-commit-interval=# Interval between commite in microseconds (1/1000000c). 0 stands for no waiting for other threads to come and do a commit in "hard" mode and no sync()/commit at all in "soft" mode. Option has only an effect if aria_group_commit is used --aria-log-dir-path=name Path to the directory where to store transactional log --aria-log-file-size=# Limit for transaction log size --aria-log-purge-type=name Specifies how Aria transactional log will be purged. One of: immediate, external, at_flush --aria-max-sort-file-size=# Don't use the fast sort index method to created index if the temporary file would get bigger than this. --aria-page-checksum Maintain page checksums (can be overridden per table with PAGE_CHECKSUM clause in CREATE TABLE) (Defaults to on; use --skip-aria-page-checksum to disable.) --aria-pagecache-age-threshold=# This characterizes the number of hits a hot block has to be untouched until it is considered aged enough to be downgraded to a warm block. This specifies the percentage ratio of that number of hits to the total number of blocks in the page cache. --aria-pagecache-buffer-size=# The size of the buffer used for index blocks for Aria tables. Increase this to get better index handling (for all reads and multiple writes) to as much as you can afford. --aria-pagecache-division-limit=# The minimum percentage of warm blocks in key cache --aria-pagecache-file-hash-size=# Number of hash buckets for open and changed files. If you have a lot of Aria files open you should increase this for faster flush of changes. A good value is probably 1/10 of number of possible open Aria files. --aria-recover-options[=name] Specifies how corrupted tables should be automatically repaired. Any combination of: NORMAL, BACKUP, FORCE, QUICK, OFF --aria-repair-threads=# Number of threads to use when repairing Aria tables. The value of 1 disables parallel repair. --aria-sort-buffer-size=# The buffer that is allocated when sorting the index when doing a REPAIR or when creating indexes with CREATE INDEX or ALTER TABLE. --aria-stats-method=name Specifies how Aria index statistics collection code should treat NULLs. One of: nulls_unequal, nulls_equal, nulls_ignored --aria-sync-log-dir=name Controls syncing directory after log file growth and new file creation. One of: NEVER, NEWFILE, ALWAYS --auto-increment-increment[=#] Auto-increment columns are incremented by this --auto-increment-offset[=#] Offset added to Auto-increment columns. Used when auto-increment-increment != 1 --autocommit Set default value for autocommit (0 or 1) (Defaults to on; use --skip-autocommit to disable.) --automatic-sp-privileges Creating and dropping stored procedures alters ACLs (Defaults to on; use --skip-automatic-sp-privileges to disable.) --back-log=# The number of outstanding connection requests MariaDB can have. This comes into play when the main MariaDB thread gets very many connection requests in a very short time (Automatically configured unless set explicitly) -b, --basedir=name Path to installation directory. All paths are usually resolved relative to this --big-tables Old variable, which if set to 1, allows large result sets by saving all temporary sets to disk, avoiding 'table full' errors. No longer needed, as the server now handles this automatically. sql_big_tables is a synonym. --bind-address=name IP address to bind to. --binlog-annotate-row-events Tells the master to annotate RBR events with the statement that caused these events (Defaults to on; use --skip-binlog-annotate-row-events to disable.) --binlog-cache-size=# The size of the transactional cache for updates to transactional engines for the binary log. If you often use transactions containing many statements, you can increase this to get more performance --binlog-checksum=name Type of BINLOG_CHECKSUM_ALG. Include checksum for log events in the binary log. One of: NONE, CRC32 --binlog-commit-wait-count=# If non-zero, binlog write will wait at most binlog_commit_wait_usec microseconds for at least this many commits to queue up for group commit to the binlog. This can reduce I/O on the binlog and provide increased opportunity for parallel apply on the slave, but too high a value will decrease commit throughput. --binlog-commit-wait-usec=# Maximum time, in microseconds, to wait for more commits to queue up for binlog group commit. Only takes effect if the value of binlog_commit_wait_count is non-zero. --binlog-direct-non-transactional-updates Causes updates to non-transactional engines using statement format to be written directly to binary log. Before using this option make sure that there are no dependencies between transactional and non-transactional tables such as in the statement INSERT INTO t_myisam SELECT * FROM t_innodb; otherwise, slaves may diverge from the master. --binlog-do-db=name Tells the master it should log updates for the specified database, and exclude all others not explicitly mentioned. --binlog-format=name What form of binary logging the master will use: either ROW for row-based binary logging, STATEMENT for statement-based binary logging, or MIXED. MIXED is statement-based binary logging except for those statements where only row-based is correct: those which involve user-defined functions (i.e. UDFs) or the UUID() function; for those, row-based binary logging is automatically used. --binlog-ignore-db=name Tells the master that updates to the given database should not be logged to the binary log. --binlog-optimize-thread-scheduling Run fast part of group commit in a single thread, to optimize kernel thread scheduling. On by default. Disable to run each transaction in group commit in its own thread, which can be slower at very high concurrency. This option is mostly for testing one algorithm versus the other, and it should not normally be necessary to change it. (Defaults to on; use --skip-binlog-optimize-thread-scheduling to disable.) --binlog-row-event-max-size=# The maximum size of a row-based binary log event in bytes. Rows will be grouped into events smaller than this size if possible. The value has to be a multiple of 256. --binlog-row-image=name Controls whether rows should be logged in 'FULL', 'NOBLOB' or 'MINIMAL' formats. 'FULL', means that all columns in the before and after image are logged. 'NOBLOB', means that mysqld avoids logging blob columns whenever possible (eg, blob column was not changed or is not part of primary key). 'MINIMAL', means that a PK equivalent (PK columns or full row if there is no PK in the table) is logged in the before image, and only changed columns are logged in the after image. (Default: FULL). --binlog-stmt-cache-size=# The size of the statement cache for updates to non-transactional engines for the binary log. If you often use statements updating a great number of rows, you can increase this to get more performance. --bootstrap Used by mysql installation scripts. --bulk-insert-buffer-size=# Size of tree cache used in bulk insert optimisation. Note that this is a limit per thread! --character-set-client-handshake Don't ignore client side character set value sent during handshake. (Defaults to on; use --skip-character-set-client-handshake to disable.) --character-set-filesystem=name Set the filesystem character set. -C, --character-set-server=name Set the default character set. --character-sets-dir=name Directory where character sets are -r, --chroot=name Chroot mysqld daemon during startup. --collation-server=name Set the default collation. --completion-type=name The transaction completion type. One of: NO_CHAIN, CHAIN, RELEASE --concurrent-insert[=name] Use concurrent insert with MyISAM. One of: NEVER, AUTO, ALWAYS --connect-timeout=# The number of seconds the mysqld server is waiting for a connect packet before responding with 'Bad handshake' --console Write error output on screen; don't remove the console window on windows. --core-file Write core on errors. -h, --datadir=name Path to the database root directory --date-format=name The DATE format (ignored) --datetime-format=name The DATETIME format (ignored) --deadlock-search-depth-long=# Long search depth for the two-step deadlock detection --deadlock-search-depth-short=# Short search depth for the two-step deadlock detection --deadlock-timeout-long=# Long timeout for the two-step deadlock detection (in microseconds) --deadlock-timeout-short=# Short timeout for the two-step deadlock detection (in microseconds) -#, --debug[=name] Built in DBUG debugger. Disabled in this build. --debug-abort-slave-event-count=# Option used by mysql-test for debugging and testing of replication. --debug-disconnect-slave-event-count=# Option used by mysql-test for debugging and testing of replication. -T, --debug-exit-info[=#] Used for debugging. Use at your own risk. --debug-gdb Set up signals usable for debugging. --debug-max-binlog-dump-events=# Option used by mysql-test for debugging and testing of replication. --debug-no-sync Disables system sync calls. Only for running tests or debugging! --debug-no-thread-alarm Disable system thread alarm calls. Disabling it may be useful in debugging or testing, never do it in production --debug-sporadic-binlog-dump-fail Option used by mysql-test for debugging and testing of replication. --default-regex-flags=name Default flags for the regex library. Any combination of: DOTALL, DUPNAMES, EXTENDED, EXTRA, MULTILINE, UNGREEDY --default-storage-engine=name The default storage engine for new tables --default-time-zone=name Set the default time zone. --default-tmp-storage-engine=name The default storage engine for user-created temporary tables --default-week-format=# The default week format used by WEEK() functions --delay-key-write[=name] Specifies how MyISAM tables handles CREATE TABLE DELAY_KEY_WRITE. If set to ON, the default, any DELAY KEY WRITEs are honored. The key buffer is then flushed only when the table closes, speeding up writes. MyISAM tables should be automatically checked upon startup in this case, and --external locking should not be used, as it can lead to index corruption. If set to OFF, DELAY KEY WRITEs are ignored, while if set to ALL, all new opened tables are treated as if created with DELAY KEY WRITEs enabled. --delayed-insert-limit=# After inserting delayed_insert_limit rows, the INSERT DELAYED handler will check if there are any SELECT statements pending. If so, it allows these to execute before continuing. --delayed-insert-timeout=# How long a INSERT DELAYED thread should wait for INSERT statements before terminating --delayed-queue-size=# What size queue (in rows) should be allocated for handling INSERT DELAYED. If the queue becomes full, any client that does INSERT DELAYED will wait until there is room in the queue again --des-key-file=name Load keys for des_encrypt() and des_encrypt from given file. --div-precision-increment=# Precision of the result of '/' operator will be increased on that value --encrypt-binlog Encrypt binary logs (including relay logs) --encrypt-tmp-disk-tables Encrypt temporary on-disk tables (created as part of query execution) --encrypt-tmp-files Encrypt temporary files (created for filesort, binary log cache, etc) --enforce-storage-engine=name Force the use of a storage engine for new tables --eq-range-index-dive-limit=# The optimizer will use existing index statistics instead of doing index dives for equality ranges if the number of equality ranges for the index is larger than or equal to this number. If set to 0, index dives are always used. --event-scheduler[=name] Enable the event scheduler. Possible values are ON, OFF, and DISABLED (keep the event scheduler completely deactivated, it cannot be activated run-time) --expensive-subquery-limit=# The maximum number of rows a subquery may examine in order to be executed during optimization and used for constant optimization --expire-logs-days=# If non-zero, binary logs will be purged after expire_logs_days days; possible purges happen at startup and at binary log rotation --explicit-defaults-for-timestamp This option causes CREATE TABLE to create all TIMESTAMP columns as NULL with DEFAULT NULL attribute, Without this option, TIMESTAMP columns are NOT NULL and have implicit DEFAULT clauses. The old behavior is deprecated. --external-locking Use system (external) locking (disabled by default). With this option enabled you can run myisamchk to test (not repair) tables while the MySQL server is running. Disable with --skip-external-locking. --extra-max-connections=# The number of connections on extra-port --extra-port=# Extra port number to use for tcp connections in a one-thread-per-connection manner. 0 means don't use another port --feedback[=name] Enable or disable FEEDBACK plugin. One of: ON, OFF, FORCE (don't start if the plugin fails to load). --feedback-http-proxy=name Proxy server host:port. --feedback-send-retry-wait=# Wait this many seconds before retrying a failed send. --feedback-send-timeout=# Timeout (in seconds) for the sending the report. --feedback-url=name Space separated URLs to send the feedback report to. --feedback-user-info=name User specified string that will be included in the feedback report. --flashback Setup the server to use flashback. This enables binary log in row mode and will enable extra logging for DDL's needed by flashback feature --flush Flush MyISAM tables to disk between SQL commands --flush-time=# A dedicated thread is created to flush all tables at the given interval --ft-boolean-syntax=name List of operators for MATCH ... AGAINST ( ... IN BOOLEAN MODE) --ft-max-word-len=# The maximum length of the word to be included in a FULLTEXT index. Note: FULLTEXT indexes must be rebuilt after changing this variable --ft-min-word-len=# The minimum length of the word to be included in a FULLTEXT index. Note: FULLTEXT indexes must be rebuilt after changing this variable --ft-query-expansion-limit=# Number of best matches to use for query expansion --ft-stopword-file=name Use stopwords from this file instead of built-in list --gdb Set up signals usable for debugging. Deprecated, use --debug-gdb instead. --general-log Log connections and queries to a table or log file. Defaults logging to a file 'hostname'.log or a table mysql.general_logif --log-output=TABLE is used. --general-log-file=name Log connections and queries to given file --getopt-prefix-matching Recognize command-line options by their unambiguos prefixes. (Defaults to on; use --skip-getopt-prefix-matching to disable.) --group-concat-max-len=# The maximum length of the result of function GROUP_CONCAT() --gtid-domain-id=# Used with global transaction ID to identify logically independent replication streams. When events can propagate through multiple parallel paths (for example multiple masters), each independent source server must use a distinct domain_id. For simple tree-shaped replication topologies, it can be left at its default, 0. --gtid-ignore-duplicates When set, different master connections in multi-source replication are allowed to receive and process event groups with the same GTID (when using GTID mode). Only one will be applied, any others will be ignored. Within a given replication domain, just the sequence number will be used to decide whether a given GTID has been already applied; this means it is the responsibility of the user to ensure that GTID sequence numbers are strictly increasing. --gtid-strict-mode Enforce strict seq_no ordering of events in the binary log. Slave stops with an error if it encounters an event that would cause it to generate an out-of-order binlog if executed. -?, --help Display this help and exit. --histogram-size=# Number of bytes used for a histogram. If set to 0, no histograms are created by ANALYZE. --histogram-type=name Specifies type of the histograms created by ANALYZE. Possible values are: SINGLE_PREC_HB - single precision height-balanced, DOUBLE_PREC_HB - double precision height-balanced. --host-cache-size=# How many host names should be cached to avoid resolving. (Automatically configured unless set explicitly) --ignore-builtin-innodb Disable initialization of builtin InnoDB plugin --ignore-db-dirs=name Specifies a directory to add to the ignore list when collecting database names from the datadir. Put a blank argument to reset the list accumulated so far. --init-connect=name Command(s) that are executed for each new connection (unless the user has SUPER privilege) --init-file=name Read SQL commands from this file at startup --init-rpl-role=name Set the replication role. One of: MASTER, SLAVE --init-slave=name Command(s) that are executed by a slave server each time the SQL thread starts --innodb[=name] Enable or disable InnoDB plugin. One of: ON, OFF, FORCE (don't start if the plugin fails to load). --innodb-adaptive-flushing Attempt flushing dirty pages to avoid IO bursts at checkpoints. (Defaults to on; use --skip-innodb-adaptive-flushing to disable.) --innodb-adaptive-flushing-lwm=# Percentage of log capacity below which no adaptive flushing happens. --innodb-adaptive-hash-index Enable InnoDB adaptive hash index (enabled by default). Disable with --skip-innodb-adaptive-hash-index. (Defaults to on; use --skip-innodb-adaptive-hash-index to disable.) --innodb-adaptive-hash-index-partitions[=#] It is an alias for innodb_adaptive_hash_index_parts; only exists to allow easier upgrade from earlier XtraDB versions. --innodb-adaptive-hash-index-parts[=#] Number of InnoDB Adaptive Hash Index Partitions (default 8) --innodb-adaptive-max-sleep-delay=# The upper limit of the sleep delay in usec. Value of 0 disables it. --innodb-autoextend-increment=# Data file autoextend increment in megabytes --innodb-autoinc-lock-mode=# The AUTOINC lock modes supported by InnoDB: 0 => Old style AUTOINC locking (for backward compatibility); 1 => New style AUTOINC locking; 2 => No AUTOINC locking (unsafe for SBR) --innodb-background-scrub-data-check-interval=# check if spaces needs scrubbing every innodb_background_scrub_data_check_interval seconds --innodb-background-scrub-data-compressed Enable scrubbing of compressed data by background threads (same as encryption_threads) --innodb-background-scrub-data-interval=# scrub spaces that were last scrubbed longer than innodb_background_scrub_data_interval seconds ago --innodb-background-scrub-data-uncompressed Enable scrubbing of uncompressed data by background threads (same as encryption_threads) --innodb-buf-dump-status-frequency=# A number between [0, 100] that tells how oftern buffer pool dump status in percentages should be printed. E.g. 10 means that buffer pool dump status is printed when every 10% of number of buffer pool pages are dumped. Default is 0 (only start and end status is printed). --innodb-buffer-page[=name] Enable or disable INNODB_BUFFER_PAGE plugin. One of: ON, OFF, FORCE (don't start if the plugin fails to load). --innodb-buffer-page-lru[=name] Enable or disable INNODB_BUFFER_PAGE_LRU plugin. One of: ON, OFF, FORCE (don't start if the plugin fails to load). --innodb-buffer-pool-chunk-size=# Size of a single memory chunk within each buffer pool instance for resizing buffer pool. Online buffer pool resizing happens at this granularity. 0 means disable resizing buffer pool. --innodb-buffer-pool-dump-at-shutdown Dump the buffer pool into a file named @@innodb_buffer_pool_filename (Defaults to on; use --skip-innodb-buffer-pool-dump-at-shutdown to disable.) --innodb-buffer-pool-dump-now Trigger an immediate dump of the buffer pool into a file named @@innodb_buffer_pool_filename --innodb-buffer-pool-dump-pct=# Dump only the hottest N% of each buffer pool, defaults to 25 --innodb-buffer-pool-filename=name Filename to/from which to dump/load the InnoDB buffer pool --innodb-buffer-pool-instances=# Number of buffer pool instances, set to higher value on high-end machines to increase scalability --innodb-buffer-pool-load-abort Abort a currently running load of the buffer pool --innodb-buffer-pool-load-at-startup Load the buffer pool from a file named @@innodb_buffer_pool_filename (Defaults to on; use --skip-innodb-buffer-pool-load-at-startup to disable.) --innodb-buffer-pool-load-now Trigger an immediate load of the buffer pool from a file named @@innodb_buffer_pool_filename --innodb-buffer-pool-populate Deprecated and ignored; only exists to allow easier upgrade from earlier XtraDB versions. --innodb-buffer-pool-size=# The size of the memory buffer InnoDB uses to cache data and indexes of its tables. --innodb-buffer-pool-stats[=name] Enable or disable INNODB_BUFFER_POOL_STATS plugin. One of: ON, OFF, FORCE (don't start if the plugin fails to load). --innodb-change-buffer-max-size=# Maximum on-disk size of change buffer in terms of percentage of the buffer pool. --innodb-change-buffering=name Buffer changes to reduce random access: OFF, ON, inserting, deleting, changing, or purging. --innodb-checksum-algorithm=name The algorithm InnoDB uses for page checksumming. Possible values are CRC32 (hardware accelerated if the CPU supports it) write crc32, allow any of the other checksums to match when reading; STRICT_CRC32 write crc32, do not allow other algorithms to match when reading; INNODB write a software calculated checksum, allow any other checksums to match when reading; STRICT_INNODB write a software calculated checksum, do not allow other algorithms to match when reading; NONE write a constant magic number, do not do any checksum verification when reading (same as innodb_checksums=OFF); STRICT_NONE write a constant magic number, do not allow values other than that magic number when reading; Files updated when this option is set to crc32 or strict_crc32 will not be readable by MariaDB versions older than 10.0.4 --innodb-checksums DEPRECATED. Use innodb_checksum_algorithm=NONE instead of setting this to OFF. Enable InnoDB checksums validation (enabled by default). Disable with --skip-innodb-checksums. (Defaults to on; use --skip-innodb-checksums to disable.) --innodb-cleaner-lsn-age-factor[=name] Deprecated and ignored; only exists to allow easier upgrade from earlier XtraDB versions.. One of: LEGACY, HIGH_CHECKPOINT, DEPRECATED --innodb-cmp[=name] Enable or disable INNODB_CMP plugin. One of: ON, OFF, FORCE (don't start if the plugin fails to load). --innodb-cmp-per-index[=name] Enable or disable INNODB_CMP_PER_INDEX plugin. One of: ON, OFF, FORCE (don't start if the plugin fails to load). --innodb-cmp-per-index-enabled Enable INFORMATION_SCHEMA.innodb_cmp_per_index, may have negative impact on performance (off by default) --innodb-cmp-per-index-reset[=name] Enable or disable INNODB_CMP_PER_INDEX_RESET plugin. One of: ON, OFF, FORCE (don't start if the plugin fails to load). --innodb-cmp-reset[=name] Enable or disable INNODB_CMP_RESET plugin. One of: ON, OFF, FORCE (don't start if the plugin fails to load). --innodb-cmpmem[=name] Enable or disable INNODB_CMPMEM plugin. One of: ON, OFF, FORCE (don't start if the plugin fails to load). --innodb-cmpmem-reset[=name] Enable or disable INNODB_CMPMEM_RESET plugin. One of: ON, OFF, FORCE (don't start if the plugin fails to load). --innodb-commit-concurrency=# Helps in performance tuning in heavily concurrent environments. --innodb-compression-algorithm[=name] Compression algorithm used on page compression. One of: none, zlib, lz4, lzo, lzma, or bzip2 --innodb-compression-default Is compression the default for new tables --innodb-compression-failure-threshold-pct[=#] If the compression failure rate of a table is greater than this number more padding is added to the pages to reduce the failures. A value of zero implies no padding --innodb-compression-level=# Compression level used for zlib compression. 0 is no compression, 1 is fastest, 9 is best compression and default is 6. --innodb-compression-pad-pct-max[=#] Percentage of empty space on a data page that can be reserved to make the page compressible. --innodb-concurrency-tickets=# Number of times a thread is allowed to enter InnoDB within the same SQL query after it has once got the ticket --innodb-corrupt-table-action=name Deprecated and ignored; only exists to allow easier upgrade from earlier XtraDB versions.. One of: assert, warn, salvage, deprecated --innodb-data-file-path=name Path to individual files and their sizes. --innodb-data-home-dir=name The common part for InnoDB table spaces. --innodb-deadlock-detect Enable/disable InnoDB deadlock detector (default ON). if set to OFF, deadlock detection is skipped, and we rely on innodb_lock_wait_timeout in case of deadlock. (Defaults to on; use --skip-innodb-deadlock-detect to disable.) --innodb-default-encryption-key-id=# Default encryption key id used for table encryption. --innodb-default-row-format=name The default ROW FORMAT for all innodb tables created without explicit ROW_FORMAT. Possible values are REDUNDANT, COMPACT, and DYNAMIC. The ROW_FORMAT value COMPRESSED is not allowed. One of: redundant, compact, dynamic --innodb-defragment Enable/disable InnoDB defragmentation (default FALSE). When set to FALSE, all existing defragmentation will be paused. And new defragmentation command will fail.Paused defragmentation commands will resume when this variable is set to true again. --innodb-defragment-fill-factor=# A number between [0.7, 1] that tells defragmentation how full it should fill a page. Default is 0.9. Number below 0.7 won't make much sense.This variable, together with innodb_defragment_fill_factor_n_recs, is introduced so defragmentation won't pack the page too full and cause page split on the next insert on every page. The variable indicating more defragmentation gain is the one effective. --innodb-defragment-fill-factor-n-recs=# How many records of space defragmentation should leave on the page. This variable, together with innodb_defragment_fill_factor, is introduced so defragmentation won't pack the page too full and cause page split on the next insert on every page. The variable indicating more defragmentation gain is the one effective. --innodb-defragment-frequency=# Do not defragment a single index more than this number of time per second.This controls the number of time defragmentation thread can request X_LOCK on an index. Defragmentation thread will check whether 1/defragment_frequency (s) has passed since it worked on this index last time, and put the index back to the queue if not enough time has passed. The actual frequency can only be lower than this given number. --innodb-defragment-n-pages=# Number of pages considered at once when merging multiple pages to defragment --innodb-defragment-stats-accuracy=# How many defragment stats changes there are before the stats are written to persistent storage. Set to 0 meaning disable defragment stats tracking. --innodb-disable-sort-file-cache Whether to disable OS system file cache for sort I/O --innodb-doublewrite Enable InnoDB doublewrite buffer (enabled by default). Disable with --skip-innodb-doublewrite. (Defaults to on; use --skip-innodb-doublewrite to disable.) --innodb-empty-free-list-algorithm[=name] Deprecated and ignored; only exists to allow easier upgrade from earlier XtraDB versions.. One of: LEGACY, BACKOFF, DEPRECATED --innodb-encrypt-log Enable redo log encryption --innodb-encrypt-tables[=name] Enable encryption for tables. Don't forget to enable --innodb-encrypt-log too. One of: OFF, ON, FORCE --innodb-encryption-rotate-key-age=# Key rotation - re-encrypt in background all pages that were encrypted with a key that many (or more) versions behind. Value 0 indicates that key rotation is disabled. --innodb-encryption-rotation-iops=# Use this many iops for background key rotation --innodb-encryption-threads=# Number of threads performing background key rotation and scrubbing --innodb-fake-changes Deprecated and ignored; only exists to allow easier upgrade from earlier XtraDB versions. --innodb-fast-shutdown[=#] Speeds up the shutdown process of the InnoDB storage engine. Possible values are 0, 1 (faster) or 2 (fastest - crash-like). --innodb-fatal-semaphore-wait-threshold=# Maximum number of seconds that semaphore times out in InnoDB. --innodb-file-format=name File format to use for new tables in .ibd files. --innodb-file-format-check Whether to perform system file format check. (Defaults to on; use --skip-innodb-file-format-check to disable.) --innodb-file-format-max[=name] The highest file format in the tablespace. --innodb-file-io-threads=# Deprecated and ignored; only exists to allow easier upgrade from earlier XtraDB versions. --innodb-file-per-table Stores each InnoDB table to an .ibd file in the database dir. (Defaults to on; use --skip-innodb-file-per-table to disable.) --innodb-fill-factor=# Percentage of B-tree page filled during bulk insert --innodb-flush-log-at-timeout[=#] Write and flush logs every (n) second. --innodb-flush-log-at-trx-commit[=#] Controls the durability/speed trade-off for commits. Set to 0 (write and flush redo log to disk only once per second), 1 (flush to disk at each commit), 2 (write to log at commit but flush to disk only once per second) or 3 (flush to disk at prepare and at commit, slower and usually redundant). 1 and 3 guarantees that after a crash, committed transactions will not be lost and will be consistent with the binlog and other transactional engines. 2 can get inconsistent and lose transactions if there is a power failure or kernel crash but not if mysqld crashes. 0 has no guarantees in case of crash. 0 and 2 can be faster than 1 or 3. --innodb-flush-method=name With which method to flush data. --innodb-flush-neighbors[=#] Set to 0 (don't flush neighbors from buffer pool), 1 (flush contiguous neighbors from buffer pool) or 2 (flush neighbors from buffer pool), when flushing a block --innodb-flush-sync Allow IO bursts at the checkpoints ignoring io_capacity setting. (Defaults to on; use --skip-innodb-flush-sync to disable.) --innodb-flushing-avg-loops=# Number of iterations over which the background flushing is averaged. --innodb-force-load-corrupted Force InnoDB to load metadata of corrupted table. --innodb-force-primary-key Do not allow to create table without primary key (off by default) --innodb-force-recovery=# Helps to save your data in case the disk image of the database becomes corrupt. --innodb-foreground-preflush[=name] Deprecated and ignored; only exists to allow easier upgrade from earlier XtraDB versions.. One of: SYNC_PREFLUSH, EXPONENTIAL_BACKOFF, DEPRECATED --innodb-ft-aux-table=name FTS internal auxiliary table to be checked --innodb-ft-being-deleted[=name] Enable or disable INNODB_FT_BEING_DELETED plugin. One of: ON, OFF, FORCE (don't start if the plugin fails to load). --innodb-ft-cache-size=# InnoDB Fulltext search cache size in bytes --innodb-ft-config[=name] Enable or disable INNODB_FT_CONFIG plugin. One of: ON, OFF, FORCE (don't start if the plugin fails to load). --innodb-ft-default-stopword[=name] Enable or disable INNODB_FT_DEFAULT_STOPWORD plugin. One of: ON, OFF, FORCE (don't start if the plugin fails to load). --innodb-ft-deleted[=name] Enable or disable INNODB_FT_DELETED plugin. One of: ON, OFF, FORCE (don't start if the plugin fails to load). --innodb-ft-enable-diag-print Whether to enable additional FTS diagnostic printout --innodb-ft-enable-stopword Create FTS index with stopword. (Defaults to on; use --skip-innodb-ft-enable-stopword to disable.) --innodb-ft-index-cache[=name] Enable or disable INNODB_FT_INDEX_CACHE plugin. One of: ON, OFF, FORCE (don't start if the plugin fails to load). --innodb-ft-index-table[=name] Enable or disable INNODB_FT_INDEX_TABLE plugin. One of: ON, OFF, FORCE (don't start if the plugin fails to load). --innodb-ft-max-token-size=# InnoDB Fulltext search maximum token size in characters --innodb-ft-min-token-size=# InnoDB Fulltext search minimum token size in characters --innodb-ft-num-word-optimize[=#] InnoDB Fulltext search number of words to optimize for each optimize table call --innodb-ft-result-cache-limit=# InnoDB Fulltext search query result cache limit in bytes --innodb-ft-server-stopword-table[=name] The user supplied stopword table name. --innodb-ft-sort-pll-degree=# InnoDB Fulltext search parallel sort degree, will round up to nearest power of 2 number --innodb-ft-total-cache-size=# Total memory allocated for InnoDB Fulltext Search cache --innodb-ft-user-stopword-table[=name] User supplied stopword table name, effective in the session level. --innodb-idle-flush-pct=# Up to what percentage of dirty pages should be flushed when innodb finds it has spare resources to do so. --innodb-immediate-scrub-data-uncompressed Enable scrubbing of data --innodb-instrument-semaphores DEPRECATED. This setting has no effect. --innodb-io-capacity=# Number of IOPs the server can do. Tunes the background IO rate --innodb-io-capacity-max=# Limit to which innodb_io_capacity can be inflated. --innodb-kill-idle-transaction=# No effect for this build. --innodb-large-prefix Support large index prefix length of REC_VERSION_56_MAX_INDEX_COL_LEN (3072) bytes. (Defaults to on; use --skip-innodb-large-prefix to disable.) --innodb-lock-schedule-algorithm=name The algorithm Innodb uses for deciding which locks to grant next when a lock is released. Possible values are FCFS grant the locks in First-Come-First-Served order; VATS use the Variance-Aware-Transaction-Scheduling algorithm, which uses an Eldest-Transaction-First heuristic.. One of: fcfs, vats --innodb-lock-wait-timeout=# Timeout in seconds an InnoDB transaction may wait for a lock before being rolled back. Values above 100000000 disable the timeout. --innodb-lock-waits[=name] Enable or disable INNODB_LOCK_WAITS plugin. One of: ON, OFF, FORCE (don't start if the plugin fails to load). --innodb-locking-fake-changes Deprecated and ignored; only exists to allow easier upgrade from earlier XtraDB versions. --innodb-locks[=name] Enable or disable INNODB_LOCKS plugin. One of: ON, OFF, FORCE (don't start if the plugin fails to load). --innodb-locks-unsafe-for-binlog DEPRECATED. This option may be removed in future releases. Please use READ COMMITTED transaction isolation level instead. Force InnoDB to not use next-key locking, to use only row-level locking. --innodb-log-arch-dir=name Deprecated and ignored; only exists to allow easier upgrade from earlier XtraDB versions. --innodb-log-arch-expire-sec[=#] Deprecated and ignored; only exists to allow easier upgrade from earlier XtraDB versions. --innodb-log-archive Deprecated and ignored; only exists to allow easier upgrade from earlier XtraDB versions. --innodb-log-block-size=# Deprecated and ignored; only exists to allow easier upgrade from earlier XtraDB versions. --innodb-log-buffer-size=# The size of the buffer which InnoDB uses to write log to the log files on disk. --innodb-log-checksum-algorithm=name Deprecated and translated to innodb_log_checksums (NONE to OFF, everything else to ON); only exists to allow easier upgrade from earlier XtraDB versions.. One of: CRC32, STRICT_CRC32, INNODB, STRICT_INNODB, NONE, STRICT_NONE, DEPRECATED --innodb-log-checksums Whether to compute and require checksums for InnoDB redo log blocks (Defaults to on; use --skip-innodb-log-checksums to disable.) --innodb-log-compressed-pages Enables/disables the logging of entire compressed page images. InnoDB logs the compressed pages to prevent corruption if the zlib compression algorithm changes. When turned OFF, InnoDB will assume that the zlib compression algorithm doesn't change. (Defaults to on; use --skip-innodb-log-compressed-pages to disable.) --innodb-log-file-size=# Size of each log file in a log group. --innodb-log-files-in-group=# Number of log files in the log group. InnoDB writes to the files in a circular fashion. --innodb-log-group-home-dir=name Path to InnoDB log files. --innodb-log-optimize-ddl Reduce redo logging when natively creating indexes or rebuilding tables. Setting this OFF avoids delay due to page flushing and allows concurrent backup. (Defaults to on; use --skip-innodb-log-optimize-ddl to disable.) --innodb-log-write-ahead-size=# Redo log write ahead unit size to avoid read-on-write, it should match the OS cache block IO size --innodb-lru-scan-depth=# How deep to scan LRU to keep it clean --innodb-max-bitmap-file-size=# Deprecated and ignored; only exists to allow easier upgrade from earlier XtraDB versions. --innodb-max-changed-pages=# Deprecated and ignored; only exists to allow easier upgrade from earlier XtraDB versions. --innodb-max-dirty-pages-pct=# Percentage of dirty pages allowed in bufferpool. --innodb-max-dirty-pages-pct-lwm=# Percentage of dirty pages at which flushing kicks in. --innodb-max-purge-lag=# Desired maximum length of the purge queue (0 = no limit) --innodb-max-purge-lag-delay=# Maximum delay of user threads in micro-seconds --innodb-max-undo-log-size[=#] Desired maximum UNDO tablespace size in bytes --innodb-metrics[=name] Enable or disable INNODB_METRICS plugin. One of: ON, OFF, FORCE (don't start if the plugin fails to load). --innodb-mirrored-log-groups=# Deprecated and ignored; only exists to allow easier upgrade from earlier XtraDB versions. --innodb-monitor-disable=name Turn off a monitor counter --innodb-monitor-enable=name Turn on a monitor counter --innodb-monitor-reset=name Reset a monitor counter --innodb-monitor-reset-all=name Reset all values for a monitor counter --innodb-mtflush-threads=# DEPRECATED. Number of multi-threaded flush threads --innodb-mutexes[=name] Enable or disable INNODB_MUTEXES plugin. One of: ON, OFF, FORCE (don't start if the plugin fails to load). --innodb-old-blocks-pct=# Percentage of the buffer pool to reserve for 'old' blocks. --innodb-old-blocks-time=# Move blocks to the 'new' end of the buffer pool if the first access was at least this many milliseconds ago. The timeout is disabled if 0. --innodb-online-alter-log-max-size=# Maximum modification log file size for online index creation --innodb-open-files=# How many files at the maximum InnoDB keeps open at the same time. --innodb-optimize-fulltext-only Only optimize the Fulltext index of the table --innodb-page-cleaners[=#] Page cleaner threads can be from 1 to 64. Default is 4. --innodb-page-size[=#] Page size to use for all InnoDB tablespaces. --innodb-prefix-index-cluster-optimization Enable prefix optimization to sometimes avoid cluster index lookups. --innodb-print-all-deadlocks Print all deadlocks to MariaDB error log (off by default) --innodb-purge-batch-size[=#] Number of UNDO log pages to purge in one batch from the history list. --innodb-purge-rseg-truncate-frequency[=#] Dictates rate at which UNDO records are purged. Value N means purge rollback segment(s) on every Nth iteration of purge invocation --innodb-purge-threads[=#] Purge threads can be from 1 to 32. Default is 4. --innodb-random-read-ahead Whether to use read ahead for random access within an extent. --innodb-read-ahead-threshold=# Number of pages that must be accessed sequentially for InnoDB to trigger a readahead. --innodb-read-io-threads=# Number of background read I/O threads in InnoDB. --innodb-read-only Start InnoDB in read only mode (off by default) --innodb-replication-delay=# Replication thread delay (ms) on the slave server if innodb_thread_concurrency is reached (0 by default) --innodb-rollback-on-timeout Roll back the complete transaction on lock wait timeout, for 4.x compatibility (disabled by default) --innodb-rollback-segments[=#] Number of undo logs to use (deprecated). --innodb-safe-truncate Use backup-safe TRUNCATE TABLE and crash-safe RENAME (incompatible with older MariaDB 10.2; ON by default) (Defaults to on; use --skip-innodb-safe-truncate to disable.) --innodb-sched-priority-cleaner=# Deprecated and ignored; only exists to allow easier upgrade from earlier XtraDB versions. --innodb-scrub-log Enable background redo log (ib_logfile0, ib_logfile1...) scrubbing --innodb-scrub-log-speed[=#] Background redo log scrubbing speed in bytes/sec --innodb-show-locks-held=# Deprecated and ignored; only exists to allow easier upgrade from earlier XtraDB versions. --innodb-show-verbose-locks=# Deprecated and ignored; only exists to allow easier upgrade from earlier XtraDB versions. --innodb-sort-buffer-size=# Memory buffer size for index creation --innodb-spin-wait-delay[=#] Maximum delay between polling for a spin lock (6 by default) --innodb-stats-auto-recalc InnoDB automatic recalculation of persistent statistics enabled for all tables unless overridden at table level (automatic recalculation is only done when InnoDB decides that the table has changed too much and needs a new statistics) (Defaults to on; use --skip-innodb-stats-auto-recalc to disable.) --innodb-stats-include-delete-marked Include delete marked records when calculating persistent statistics --innodb-stats-method=name Specifies how InnoDB index statistics collection code should treat NULLs. Possible values are NULLS_EQUAL (default), NULLS_UNEQUAL and NULLS_IGNORED. One of: nulls_equal, nulls_unequal, nulls_ignored --innodb-stats-modified-counter=# The number of rows modified before we calculate new statistics (default 0 = current limits) --innodb-stats-on-metadata Enable statistics gathering for metadata commands such as SHOW TABLE STATUS for tables that use transient statistics (off by default) --innodb-stats-persistent InnoDB persistent statistics enabled for all tables unless overridden at table level (Defaults to on; use --skip-innodb-stats-persistent to disable.) --innodb-stats-persistent-sample-pages=# The number of leaf index pages to sample when calculating persistent statistics (by ANALYZE, default 20) --innodb-stats-sample-pages=# Deprecated, use innodb_stats_transient_sample_pages instead --innodb-stats-traditional Enable traditional statistic calculation based on number of configured pages (default true) (Defaults to on; use --skip-innodb-stats-traditional to disable.) --innodb-stats-transient-sample-pages=# The number of leaf index pages to sample when calculating transient statistics (if persistent statistics are not used, default 8) --innodb-status-file Enable SHOW ENGINE INNODB STATUS output in the innodb_status.<pid> file --innodb-status-output Enable InnoDB monitor output to the error log. --innodb-status-output-locks Enable InnoDB lock monitor output to the error log. Requires innodb_status_output=ON. --innodb-strict-mode Use strict mode when evaluating create options. (Defaults to on; use --skip-innodb-strict-mode to disable.) --innodb-support-xa Enable InnoDB support for the XA two-phase commit (Defaults to on; use --skip-innodb-support-xa to disable.) --innodb-sync-array-size[=#] Size of the mutex/lock wait array. --innodb-sync-spin-loops=# Count of spin-loop rounds in InnoDB mutexes (30 by default) --innodb-sys-columns[=name] Enable or disable INNODB_SYS_COLUMNS plugin. One of: ON, OFF, FORCE (don't start if the plugin fails to load). --innodb-sys-datafiles[=name] Enable or disable INNODB_SYS_DATAFILES plugin. One of: ON, OFF, FORCE (don't start if the plugin fails to load). --innodb-sys-fields[=name] Enable or disable INNODB_SYS_FIELDS plugin. One of: ON, OFF, FORCE (don't start if the plugin fails to load). --innodb-sys-foreign[=name] Enable or disable INNODB_SYS_FOREIGN plugin. One of: ON, OFF, FORCE (don't start if the plugin fails to load). --innodb-sys-foreign-cols[=name] Enable or disable INNODB_SYS_FOREIGN_COLS plugin. One of: ON, OFF, FORCE (don't start if the plugin fails to load). --innodb-sys-indexes[=name] Enable or disable INNODB_SYS_INDEXES plugin. One of: ON, OFF, FORCE (don't start if the plugin fails to load). --innodb-sys-semaphore-waits[=name] Enable or disable INNODB_SYS_SEMAPHORE_WAITS plugin. One of: ON, OFF, FORCE (don't start if the plugin fails to load). --innodb-sys-tables[=name] Enable or disable INNODB_SYS_TABLES plugin. One of: ON, OFF, FORCE (don't start if the plugin fails to load). --innodb-sys-tablespaces[=name] Enable or disable INNODB_SYS_TABLESPACES plugin. One of: ON, OFF, FORCE (don't start if the plugin fails to load). --innodb-sys-tablestats[=name] Enable or disable INNODB_SYS_TABLESTATS plugin. One of: ON, OFF, FORCE (don't start if the plugin fails to load). --innodb-sys-virtual[=name] Enable or disable INNODB_SYS_VIRTUAL plugin. One of: ON, OFF, FORCE (don't start if the plugin fails to load). --innodb-table-locks Enable InnoDB locking in LOCK TABLES (Defaults to on; use --skip-innodb-table-locks to disable.) --innodb-tablespaces-encryption[=name] Enable or disable INNODB_TABLESPACES_ENCRYPTION plugin. One of: ON, OFF, FORCE (don't start if the plugin fails to load). --innodb-tablespaces-scrubbing[=name] Enable or disable INNODB_TABLESPACES_SCRUBBING plugin. One of: ON, OFF, FORCE (don't start if the plugin fails to load). --innodb-temp-data-file-path=name Path to files and their sizes making temp-tablespace. --innodb-thread-concurrency=# Helps in performance tuning in heavily concurrent environments. Sets the maximum number of threads allowed inside InnoDB. Value 0 will disable the thread throttling. --innodb-thread-sleep-delay=# Time of innodb thread sleeping before joining InnoDB queue (usec). Value 0 disable a sleep --innodb-tmpdir[=name] Directory for temporary non-tablespace files. --innodb-track-changed-pages Deprecated and ignored; only exists to allow easier upgrade from earlier XtraDB versions. --innodb-track-redo-log-now Deprecated and ignored; only exists to allow easier upgrade from earlier XtraDB versions. --innodb-trx[=name] Enable or disable INNODB_TRX plugin. One of: ON, OFF, FORCE (don't start if the plugin fails to load). --innodb-undo-directory=name Directory where undo tablespace files live, this path can be absolute. --innodb-undo-log-truncate Enable or Disable Truncate of UNDO tablespace. --innodb-undo-logs[=#] Number of undo logs to use. --innodb-undo-tablespaces=# Number of undo tablespaces to use. --innodb-use-atomic-writes Enable atomic writes, instead of using the doublewrite buffer, for files on devices that supports atomic writes. To use this option one must use file_per_table=1, flush_method=O_DIRECT and use_fallocate=1. This option only works on Linux with either FusionIO cards using the directFS filesystem or with Shannon cards using any file system. (Defaults to on; use --skip-innodb-use-atomic-writes to disable.) --innodb-use-fallocate Use posix_fallocate() to allocate files. DEPRECATED, has no effect. --innodb-use-global-flush-log-at-trx-commit Deprecated and ignored; only exists to allow easier upgrade from earlier XtraDB versions. --innodb-use-mtflush DEPRECATED. Use multi-threaded flush. Default FALSE. --innodb-use-native-aio Use native AIO if supported on this platform. (Defaults to on; use --skip-innodb-use-native-aio to disable.) --innodb-use-stacktrace Deprecated and ignored; only exists to allow easier upgrade from earlier XtraDB versions. --innodb-use-trim Deallocate (punch_hole|trim) unused portions of the page compressed page (on by default) (Defaults to on; use --skip-innodb-use-trim to disable.) --innodb-write-io-threads=# Number of background write I/O threads in InnoDB. --interactive-timeout=# The number of seconds the server waits for activity on an interactive connection before closing it --join-buffer-size=# The size of the buffer that is used for joins --join-buffer-space-limit=# The limit of the space for all join buffers used by a query --join-cache-level=# Controls what join operations can be executed with join buffers. Odd numbers are used for plain join buffers while even numbers are used for linked buffers --keep-files-on-create Don't overwrite stale .MYD and .MYI even if no directory is specified --key-buffer-size=# The size of the buffer used for index blocks for MyISAM tables. Increase this to get better index handling (for all reads and multiple writes) to as much as you can afford --key-cache-age-threshold=# This characterizes the number of hits a hot block has to be untouched until it is considered aged enough to be downgraded to a warm block. This specifies the percentage ratio of that number of hits to the total number of blocks in key cache --key-cache-block-size=# The default size of key cache blocks --key-cache-division-limit=# The minimum percentage of warm blocks in key cache --key-cache-file-hash-size=# Number of hash buckets for open and changed files. If you have a lot of MyISAM files open you should increase this for faster flush of changes. A good value is probably 1/10 of number of possible open MyISAM files. --key-cache-segments=# The number of segments in a key cache -L, --language=name Client error messages in given language. May be given as a full path. Deprecated. Use --lc-messages-dir instead. --large-pages Enable support for large pages --lc-messages=name Set the language used for the error messages. -L, --lc-messages-dir=name Directory where error messages are --lc-time-names=name Set the language used for the month names and the days of the week. --local-infile Enable LOAD DATA LOCAL INFILE (Defaults to on; use --skip-local-infile to disable.) --lock-wait-timeout=# Timeout in seconds to wait for a lock before returning an error. --log-basename=name Basename for all log files and the .pid file. This sets all log file names at once (in 'datadir') and is normally the only option you need for specifying log files. Sets names for --log-bin, --log-bin-index, --relay-log, --relay-log-index, --general-log-file, --log-slow-query-log-file, --log-error-file, and --pid-file --log-bin[=name] Log update queries in binary format. Optional argument should be name for binary log. If not given 'datadir'/'log-basename'-bin or 'datadir'/mysql-bin will be used (the later if --log-basename is not specified). We strongly recommend to use either --log-basename or specify a filename to ensure that replication doesn't stop if the real hostname of the computer changes. --log-bin-compress Whether the binary log can be compressed --log-bin-compress-min-len[=#] Minimum length of sql statement(in statement mode) or record(in row mode)that can be compressed. --log-bin-index=name File that holds the names for last binary log files. --log-bin-trust-function-creators If set to FALSE (the default), then when --log-bin is used, creation of a stored function (or trigger) is allowed only to users having the SUPER privilege and only if this stored function (trigger) may not break binary logging. Note that if ALL connections to this server ALWAYS use row-based binary logging, the security issues do not exist and the binary logging cannot break, so you can safely set this to TRUE --log-error[=name] Log errors to file (instead of stdout). If file name is not specified then 'datadir'/'log-basename'.err or the 'pid-file' path with extension .err is used --log-isam[=name] Log all MyISAM changes to file. --log-output=name How logs should be written. Any combination of: NONE, FILE, TABLE --log-queries-not-using-indexes Log queries that are executed without benefit of any index to the slow log if it is open --log-short-format Don't log extra information to update and slow-query logs. --log-slave-updates Tells the slave to log the updates from the slave thread to the binary log. You will need to turn it on if you plan to daisy-chain the slaves. --log-slow-admin-statements Log slow OPTIMIZE, ANALYZE, ALTER and other administrative statements to the slow log if it is open. (Defaults to on; use --skip-log-slow-admin-statements to disable.) --log-slow-filter=name Log only certain types of queries. Any combination of: admin, filesort, filesort_on_disk, full_join, full_scan, query_cache, query_cache_miss, tmp_table, tmp_table_on_disk --log-slow-rate-limit=# Write to slow log every #th slow query. Set to 1 to log everything. Increase it to reduce the size of the slow or the performance impact of slow logging --log-slow-slave-statements Log slow statements executed by slave thread to the slow log if it is open. (Defaults to on; use --skip-log-slow-slave-statements to disable.) --log-slow-verbosity=name Verbosity level for the slow log. Any combination of: innodb, query_plan, explain --log-tc=name Path to transaction coordinator log (used for transactions that affect more than one storage engine, when binary log is disabled). --log-tc-size=# Size of transaction coordinator log. -W, --log-warnings[=#] Log some not critical warnings to the general log file.Value can be between 0 and 11. Higher values mean more verbosity --long-query-time=# Log all queries that have taken more than long_query_time seconds to execute to the slow query log file. The argument will be treated as a decimal value with microsecond precision --low-priority-updates INSERT/DELETE/UPDATE has lower priority than selects --lower-case-table-names[=#] If set to 1 table names are stored in lowercase on disk and table names will be case-insensitive. Should be set to 2 if you are using a case insensitive file system --master-info-file=name The location and name of the file that remembers the master and where the I/O replication thread is in the master's binlogs. Defaults to master.info --master-retry-count=# The number of tries the slave will make to connect to the master before giving up. --master-verify-checksum Force checksum verification of logged events in the binary log before sending them to slaves or printing them in the output of SHOW BINLOG EVENTS --max-allowed-packet=# Max packet length to send to or receive from the server --max-binlog-cache-size=# Sets the total size of the transactional cache --max-binlog-size=# Binary log will be rotated automatically when the size exceeds this value. --max-binlog-stmt-cache-size=# Sets the total size of the statement cache --max-connect-errors=# If there is more than this number of interrupted connections from a host this host will be blocked from further connections --max-connections=# The number of simultaneous clients allowed --max-delayed-threads=# Don't start more than this number of threads to handle INSERT DELAYED statements. If set to zero INSERT DELAYED will be not used --max-digest-length=# Maximum length considered for digest text. --max-error-count=# Max number of errors/warnings to store for a statement --max-heap-table-size=# Don't allow creation of heap tables bigger than this --max-join-size=# Joins that are probably going to read more than max_join_size records return an error --max-length-for-sort-data=# Max number of bytes in sorted records --max-long-data-size=# The maximum BLOB length to send to server from mysql_send_long_data API. Deprecated option; use max_allowed_packet instead. --max-prepared-stmt-count=# Maximum number of prepared statements in the server --max-recursive-iterations[=#] Maximum number of iterations when executing recursive queries --max-relay-log-size=# relay log will be rotated automatically when the size exceeds this value. If 0 at startup, it's set to max_binlog_size --max-seeks-for-key=# Limit assumed max number of seeks when looking up rows based on a key --max-session-mem-used=# Amount of memory a single user session is allowed to allocate. This limits the value of the session variable MEM_USED --max-sort-length=# The number of bytes to use when sorting BLOB or TEXT values (only the first max_sort_length bytes of each value are used; the rest are ignored) --max-sp-recursion-depth[=#] Maximum stored procedure recursion depth --max-statement-time=# A query that has taken more than max_statement_time seconds will be aborted. The argument will be treated as a decimal value with microsecond precision. A value of 0 (default) means no timeout --max-tmp-tables=# Unused, will be removed. --max-user-connections=# The maximum number of active connections for a single user (0 = no limit) --max-write-lock-count=# After this many write locks, allow some read locks to run in between --memlock Lock mysqld in memory. --metadata-locks-cache-size=# Unused --metadata-locks-hash-instances=# Unused --min-examined-row-limit=# Don't write queries to slow log that examine fewer rows than that --mrr-buffer-size=# Size of buffer to use when using MRR with range access --multi-range-count=# Ignored. Use mrr_buffer_size instead --myisam-block-size=# Block size to be used for MyISAM index pages --myisam-data-pointer-size=# Default pointer size to be used for MyISAM tables --myisam-max-sort-file-size=# Don't use the fast sort index method to created index if the temporary file would get bigger than this --myisam-mmap-size=# Restricts the total memory used for memory mapping of MySQL tables --myisam-recover-options[=name] Specifies how corrupted tables should be automatically repaired. Any combination of: DEFAULT, BACKUP, FORCE, QUICK, BACKUP_ALL, OFF --myisam-repair-threads=# If larger than 1, when repairing a MyISAM table all indexes will be created in parallel, with one thread per index. The value of 1 disables parallel repair --myisam-sort-buffer-size=# The buffer that is allocated when sorting the index when doing a REPAIR or when creating indexes with CREATE INDEX or ALTER TABLE --myisam-stats-method=name Specifies how MyISAM index statistics collection code should treat NULLs. Possible values of name are NULLS_UNEQUAL (default behavior for 4.1 and later), NULLS_EQUAL (emulate 4.0 behavior), and NULLS_IGNORED --myisam-use-mmap Use memory mapping for reading and writing MyISAM tables --mysql56-temporal-format Use MySQL-5.6 (instead of MariaDB-5.3) format for TIME, DATETIME, TIMESTAMP columns. (Defaults to on; use --skip-mysql56-temporal-format to disable.) --net-buffer-length=# Buffer length for TCP/IP and socket communication --net-read-timeout=# Number of seconds to wait for more data from a connection before aborting the read --net-retry-count=# If a read on a communication port is interrupted, retry this many times before giving up --net-write-timeout=# Number of seconds to wait for a block to be written to a connection before aborting the write --old Use compatible behavior from previous MariaDB version. See also --old-mode --old-alter-table Use old, non-optimized alter table --old-mode=name Used to emulate old behavior from earlier MariaDB or MySQL versions. Any combination of: NO_DUP_KEY_WARNINGS_WITH_IGNORE, NO_PROGRESS_INFO, ZERO_DATE_TIME_CAST --old-passwords Use old password encryption method (needed for 4.0 and older clients) --old-style-user-limits Enable old-style user limits (before 5.0.3, user resources were counted per each user+host vs. per account). --open-files-limit=# If this is not 0, then mysqld will use this value to reserve file descriptors to use with setrlimit(). If this value is 0 or autoset then mysqld will reserve max_connections*5 or max_connections + table_cache*2 (whichever is larger) number of file descriptors (Automatically configured unless set explicitly) --optimizer-prune-level=# Controls the heuristic(s) applied during query optimization to prune less-promising partial plans from the optimizer search space. Meaning: 0 - do not apply any heuristic, thus perform exhaustive search; 1 - prune plans based on number of retrieved rows --optimizer-search-depth=# Maximum depth of search performed by the query optimizer. Values larger than the number of relations in a query result in better query plans, but take longer to compile a query. Values smaller than the number of tables in a relation result in faster optimization, but may produce very bad query plans. If set to 0, the system will automatically pick a reasonable value. --optimizer-selectivity-sampling-limit=# Controls number of record samples to check condition selectivity --optimizer-switch=name Fine-tune the optimizer behavior. Takes a comma-separated list of option=value pairs, where value is on, off, or default, and options are: index_merge, index_merge_union, index_merge_sort_union, index_merge_intersection, index_merge_sort_intersection, engine_condition_pushdown, index_condition_pushdown, derived_merge, derived_with_keys, firstmatch, loosescan, materialization, in_to_exists, semijoin, partial_match_rowid_merge, partial_match_table_scan, subquery_cache, mrr, mrr_cost_based, mrr_sort_keys, outer_join_with_cache, semijoin_with_cache, join_cache_incremental, join_cache_hashed, join_cache_bka, optimize_join_buffer_size, table_elimination, extended_keys, exists_to_in, orderby_uses_equalities, condition_pushdown_for_derived --optimizer-use-condition-selectivity=# Controls selectivity of which conditions the optimizer takes into account to calculate cardinality of a partial join when it searches for the best execution plan Meaning: 1 - use selectivity of index backed range conditions to calculate the cardinality of a partial join if the last joined table is accessed by full table scan or an index scan, 2 - use selectivity of index backed range conditions to calculate the cardinality of a partial join in any case, 3 - additionally always use selectivity of range conditions that are not backed by any index to calculate the cardinality of a partial join, 4 - use histograms to calculate selectivity of range conditions that are not backed by any index to calculate the cardinality of a partial join.5 - additionally use selectivity of certain non-range predicates calculated on record samples --partition[=name] Enable or disable partition plugin. One of: ON, OFF, FORCE (don't start if the plugin fails to load). --performance-schema Enable the performance schema. --performance-schema-accounts-size=# Maximum number of instrumented user@host accounts. Use 0 to disable, -1 for automated sizing. --performance-schema-consumer-events-stages-current Default startup value for the events_stages_current consumer. --performance-schema-consumer-events-stages-history Default startup value for the events_stages_history consumer. --performance-schema-consumer-events-stages-history-long Default startup value for the events_stages_history_long consumer. --performance-schema-consumer-events-statements-current Default startup value for the events_statements_current consumer. (Defaults to on; use --skip-performance-schema-consumer-events-statements-current to disable.) --performance-schema-consumer-events-statements-history Default startup value for the events_statements_history consumer. --performance-schema-consumer-events-statements-history-long Default startup value for the events_statements_history_long consumer. --performance-schema-consumer-events-waits-current Default startup value for the events_waits_current consumer. --performance-schema-consumer-events-waits-history Default startup value for the events_waits_history consumer. --performance-schema-consumer-events-waits-history-long Default startup value for the events_waits_history_long consumer. --performance-schema-consumer-global-instrumentation Default startup value for the global_instrumentation consumer. (Defaults to on; use --skip-performance-schema-consumer-global-instrumentation to disable.) --performance-schema-consumer-statements-digest Default startup value for the statements_digest consumer. (Defaults to on; use --skip-performance-schema-consumer-statements-digest to disable.) --performance-schema-consumer-thread-instrumentation Default startup value for the thread_instrumentation consumer. (Defaults to on; use --skip-performance-schema-consumer-thread-instrumentation to disable.) --performance-schema-digests-size=# Size of the statement digest. Use 0 to disable, -1 for automated sizing. --performance-schema-events-stages-history-long-size=# Number of rows in EVENTS_STAGES_HISTORY_LONG. Use 0 to disable, -1 for automated sizing. --performance-schema-events-stages-history-size=# Number of rows per thread in EVENTS_STAGES_HISTORY. Use 0 to disable, -1 for automated sizing. --performance-schema-events-statements-history-long-size=# Number of rows in EVENTS_STATEMENTS_HISTORY_LONG. Use 0 to disable, -1 for automated sizing. --performance-schema-events-statements-history-size=# Number of rows per thread in EVENTS_STATEMENTS_HISTORY. Use 0 to disable, -1 for automated sizing. --performance-schema-events-waits-history-long-size=# Number of rows in EVENTS_WAITS_HISTORY_LONG. Use 0 to disable, -1 for automated sizing. --performance-schema-events-waits-history-size=# Number of rows per thread in EVENTS_WAITS_HISTORY. Use 0 to disable, -1 for automated sizing. --performance-schema-hosts-size=# Maximum number of instrumented hosts. Use 0 to disable, -1 for automated sizing. --performance-schema-instrument[=name] Default startup value for a performance schema instrument. --performance-schema-max-cond-classes=# Maximum number of condition instruments. --performance-schema-max-cond-instances=# Maximum number of instrumented condition objects. Use 0 to disable, -1 for automated sizing. --performance-schema-max-digest-length=# Maximum length considered for digest text, when stored in performance_schema tables. --performance-schema-max-file-classes=# Maximum number of file instruments. --performance-schema-max-file-handles=# Maximum number of opened instrumented files. --performance-schema-max-file-instances=# Maximum number of instrumented files. Use 0 to disable, -1 for automated sizing. --performance-schema-max-mutex-classes=# Maximum number of mutex instruments. --performance-schema-max-mutex-instances=# Maximum number of instrumented MUTEX objects. Use 0 to disable, -1 for automated sizing. --performance-schema-max-rwlock-classes=# Maximum number of rwlock instruments. --performance-schema-max-rwlock-instances=# Maximum number of instrumented RWLOCK objects. Use 0 to disable, -1 for automated sizing. --performance-schema-max-socket-classes=# Maximum number of socket instruments. --performance-schema-max-socket-instances=# Maximum number of opened instrumented sockets. Use 0 to disable, -1 for automated sizing. --performance-schema-max-stage-classes=# Maximum number of stage instruments. --performance-schema-max-statement-classes=# Maximum number of statement instruments. --performance-schema-max-table-handles=# Maximum number of opened instrumented tables. Use 0 to disable, -1 for automated sizing. --performance-schema-max-table-instances=# Maximum number of instrumented tables. Use 0 to disable, -1 for automated sizing. --performance-schema-max-thread-classes=# Maximum number of thread instruments. --performance-schema-max-thread-instances=# Maximum number of instrumented threads. Use 0 to disable, -1 for automated sizing. --performance-schema-session-connect-attrs-size=# Size of session attribute string buffer per thread. Use 0 to disable, -1 for automated sizing. --performance-schema-setup-actors-size=# Maximum number of rows in SETUP_ACTORS. --performance-schema-setup-objects-size=# Maximum number of rows in SETUP_OBJECTS. --performance-schema-users-size=# Maximum number of instrumented users. Use 0 to disable, -1 for automated sizing. --pid-file=name Pid file used by safe_mysqld --plugin-dir=name Directory for plugins --plugin-load=name Semicolon-separated list of plugins to load, where each plugin is specified as ether a plugin_name=library_file pair or only a library_file. If the latter case, all plugins from a given library_file will be loaded. --plugin-load-add=name Optional semicolon-separated list of plugins to load. This option adds to the list specified by --plugin-load in an incremental way. It can be specified many times, adding more plugins every time. --plugin-maturity=name The lowest desirable plugin maturity. Plugins less mature than that will not be installed or loaded. One of: unknown, experimental, alpha, beta, gamma, stable -P, --port=# Port number to use for connection or 0 to default to, my.cnf, $MYSQL_TCP_PORT, /etc/services, built-in default (3306), whatever comes first --port-open-timeout=# Maximum time in seconds to wait for the port to become free. (Default: No wait). --preload-buffer-size=# The size of the buffer that is allocated when preloading indexes --profiling-history-size=# Number of statements about which profiling information is maintained. If set to 0, no profiles are stored. See SHOW PROFILES. --progress-report-time=# Seconds between sending progress reports to the client for time-consuming statements. Set to 0 to disable progress reporting. --query-alloc-block-size=# Allocation block size for query parsing and execution --query-cache-limit=# Don't cache results that are bigger than this --query-cache-min-res-unit=# The minimum size for blocks allocated by the query cache --query-cache-size=# The memory allocated to store results from old queries --query-cache-strip-comments Strip all comments from a query before storing it in the query cache --query-cache-type=name OFF = Don't cache or retrieve results. ON = Cache all results except SELECT SQL_NO_CACHE ... queries. DEMAND = Cache only SELECT SQL_CACHE ... queries --query-cache-wlock-invalidate Invalidate queries in query cache on LOCK for write --query-prealloc-size=# Persistent buffer for query parsing and execution --range-alloc-block-size=# Allocation block size for storing ranges during optimization --read-binlog-speed-limit=# Maximum speed(KB/s) to read binlog from master (0 = no limit) --read-buffer-size=# Each thread that does a sequential scan allocates a buffer of this size for each table it scans. If you do many sequential scans, you may want to increase this value --read-only Make all non-temporary tables read-only, with the exception for replication (slave) threads and users with the SUPER privilege --read-rnd-buffer-size=# When reading rows in sorted order after a sort, the rows are read through this buffer to avoid a disk seeks --relay-log=name The location and name to use for relay logs. --relay-log-index=name The location and name to use for the file that keeps a list of the last relay logs --relay-log-info-file=name The location and name of the file that remembers where the SQL replication thread is in the relay logs. --relay-log-purge if disabled - do not purge relay logs. if enabled - purge them as soon as they are no more needed. (Defaults to on; use --skip-relay-log-purge to disable.) --relay-log-recovery Enables automatic relay log recovery right after the database startup, which means that the IO Thread starts re-fetching from the master right after the last transaction processed. --relay-log-space-limit=# Maximum space to use for all relay logs --replicate-annotate-row-events Tells the slave to write annotate rows events received from the master to its own binary log. Ignored if log_slave_updates is not set (Defaults to on; use --skip-replicate-annotate-row-events to disable.) --replicate-do-db=name Tells the slave thread to restrict replication to the specified database. To specify more than one database, use the directive multiple times, once for each database. Note that this will only work if you do not use cross-database queries such as UPDATE some_db.some_table SET foo='bar' while having selected a different or no database. If you need cross database updates to work, make sure you have 3.23.28 or later, and use replicate-wild-do-table=db_name.%. --replicate-do-table=name Tells the slave thread to restrict replication to the specified table. To specify more than one table, use the directive multiple times, once for each table. This will work for cross-database updates, in contrast to replicate-do-db. --replicate-events-marked-for-skip=name Whether the slave should replicate events that were created with @@skip_replication=1 on the master. Default REPLICATE (no events are skipped). Other values are FILTER_ON_SLAVE (events will be sent by the master but ignored by the slave) and FILTER_ON_MASTER (events marked with @@skip_replication=1 will be filtered on the master and never be sent to the slave). --replicate-ignore-db=name Tells the slave thread to not replicate to the specified database. To specify more than one database to ignore, use the directive multiple times, once for each database. This option will not work if you use cross database updates. If you need cross database updates to work, make sure you have 3.23.28 or later, and use replicate-wild-ignore-table=db_name.%. --replicate-ignore-table=name Tells the slave thread to not replicate to the specified table. To specify more than one table to ignore, use the directive multiple times, once for each table. This will work for cross-database updates, in contrast to replicate-ignore-db. --replicate-rewrite-db=name Updates to a database with a different name than the original. Example: replicate-rewrite-db=master_db_name->slave_db_name. --replicate-same-server-id In replication, if set to 1, do not skip events having our server id. Default value is 0 (to break infinite loops in circular replication). Can't be set to 1 if --log-slave-updates is used. --replicate-wild-do-table=name Tells the slave thread to restrict replication to the tables that match the specified wildcard pattern. To specify more than one table, use the directive multiple times, once for each table. This will work for cross-database updates. Example: replicate-wild-do-table=foo%.bar% will replicate only updates to tables in all databases that start with foo and whose table names start with bar. --replicate-wild-ignore-table=name Tells the slave thread to not replicate to the tables that match the given wildcard pattern. To specify more than one table to ignore, use the directive multiple times, once for each table. This will work for cross-database updates. Example: replicate-wild-ignore-table=foo%.bar% will not do updates to tables in databases that start with foo and whose table names start with bar. --report-host=name Hostname or IP of the slave to be reported to the master during slave registration. Will appear in the output of SHOW SLAVE HOSTS. Leave unset if you do not want the slave to register itself with the master. Note that it is not sufficient for the master to simply read the IP of the slave off the socket once the slave connects. Due to NAT and other routing issues, that IP may not be valid for connecting to the slave from the master or other hosts --report-password=name The account password of the slave to be reported to the master during slave registration --report-port=# Port for connecting to slave reported to the master during slave registration. Set it only if the slave is listening on a non-default port or if you have a special tunnel from the master or other clients to the slave. If not sure, leave this option unset --report-user=name The account user name of the slave to be reported to the master during slave registration --rowid-merge-buff-size=# The size of the buffers used [NOT] IN evaluation via partial matching --safe-mode Skip some optimize stages (for testing). Deprecated. --safe-user-create Don't allow new user creation by the user who has no write privileges to the mysql.user table. --secure-auth Disallow authentication for accounts that have old (pre-4.1) passwords (Defaults to on; use --skip-secure-auth to disable.) --secure-file-priv=name Limit LOAD DATA, SELECT ... OUTFILE, and LOAD_FILE() to files within specified directory --sequence[=name] Enable or disable SEQUENCE plugin. One of: ON, OFF, FORCE (don't start if the plugin fails to load). --server-id=# Uniquely identifies the server instance in the community of replication partners --session-track-schema Track changes to the default schema. (Defaults to on; use --skip-session-track-schema to disable.) --session-track-state-change Track changes to the session state. --session-track-system-variables=name Track changes in registered system variables. For compatibility with MySQL defaults this variable should be set to "autocommit, character_set_client, character_set_connection, character_set_results, time_zone" --session-track-transaction-info=name Track changes to the transaction attributes. OFF to disable; STATE to track just transaction state (Is there an active transaction? Does it have any data? etc.); CHARACTERISTICS to track transaction state and report all statements needed to start a transaction withthe same characteristics (isolation level, read only/read write,snapshot - but not any work done / data modified within the transaction). --show-slave-auth-info Show user and password in SHOW SLAVE HOSTS on this master. --silent-startup Don't print [Note] to the error log during startup. --skip-bdb Deprecated option; Exist only for compatibility with old my.cnf files --skip-grant-tables Start without grant tables. This gives all users FULL ACCESS to all tables. --skip-host-cache Don't cache host names. --skip-name-resolve Don't resolve hostnames. All hostnames are IP's or 'localhost'. --skip-networking Don't allow connection with TCP/IP --skip-show-database Don't allow 'SHOW DATABASE' commands --skip-slave-start If set, slave is not autostarted. --slave-compressed-protocol Use compression on master/slave protocol --slave-ddl-exec-mode=name How replication events should be executed. Legal values are STRICT and IDEMPOTENT (default). In IDEMPOTENT mode, replication will not stop for DDL operations that are idempotent. This means that CREATE TABLE is treated as CREATE TABLE OR REPLACE and DROP TABLE is treated as DROP TABLE IF EXISTS. --slave-domain-parallel-threads=# Maximum number of parallel threads to use on slave for events in a single replication domain. When using multiple domains, this can be used to limit a single domain from grabbing all threads and thus stalling other domains. The default of 0 means to allow a domain to grab as many threads as it wants, up to the value of slave_parallel_threads. --slave-exec-mode=name How replication events should be executed. Legal values are STRICT (default) and IDEMPOTENT. In IDEMPOTENT mode, replication will not stop for operations that are idempotent. For example, in row based replication attempts to delete rows that doesn't exist will be ignored. In STRICT mode, replication will stop on any unexpected difference between the master and the slave. --slave-load-tmpdir=name The location where the slave should put its temporary files when replicating a LOAD DATA INFILE command --slave-max-allowed-packet=# The maximum packet length to sent successfully from the master to slave. --slave-net-timeout=# Number of seconds to wait for more data from any master/slave connection before aborting the read --slave-parallel-max-queued=# Limit on how much memory SQL threads should use per parallel replication thread when reading ahead in the relay log looking for opportunities for parallel replication. Only used when --slave-parallel-threads > 0. --slave-parallel-mode=name Controls what transactions are applied in parallel when using --slave-parallel-threads. Possible values: "optimistic" tries to apply most transactional DML in parallel, and handles any conflicts with rollback and retry. "conservative" limits parallelism in an effort to avoid any conflicts. "aggressive" tries to maximise the parallelism, possibly at the cost of increased conflict rate. "minimal" only parallelizes the commit steps of transactions. "none" disables parallel apply completely. --slave-parallel-threads=# If non-zero, number of threads to spawn to apply in parallel events on the slave that were group-committed on the master or were logged with GTID in different replication domains. Note that these threads are in addition to the IO and SQL threads, which are always created by a replication slave --slave-parallel-workers=# Alias for slave_parallel_threads --slave-run-triggers-for-rbr=name Modes for how triggers in row-base replication on slave side will be executed. Legal values are NO (default), YES and LOGGING. NO means that trigger for RBR will not be running on slave. YES and LOGGING means that triggers will be running on slave, if there was not triggers running on the master for the statement. LOGGING also means results of that the executed triggers work will be written to the binlog. --slave-skip-errors=name Tells the slave thread to continue replication when a query event returns an error from the provided list --slave-sql-verify-checksum Force checksum verification of replication events after reading them from relay log. Note: Events are always checksum-verified by slave on receiving them from the network before writing them to the relay log (Defaults to on; use --skip-slave-sql-verify-checksum to disable.) --slave-transaction-retries=# Number of times the slave SQL thread will retry a transaction in case it failed with a deadlock or elapsed lock wait timeout, before giving up and stopping --slave-type-conversions=name Set of slave type conversions that are enabled. If the variable is empty, no conversions are allowed and it is expected that the types match exactly. Any combination of: ALL_LOSSY, ALL_NON_LOSSY --slow-launch-time=# If creating the thread takes longer than this value (in seconds), the Slow_launch_threads counter will be incremented --slow-query-log Log slow queries to a table or log file. Defaults logging to a file 'hostname'-slow.log or a table mysql.slow_log if --log-output=TABLE is used. Must be enabled to activate other slow log options. --slow-query-log-file=name Log slow queries to given log file. Defaults logging to 'hostname'-slow.log. Must be enabled to activate other slow log options --socket=name Socket file to use for connection --sort-buffer-size=# Each thread that needs to do a sort allocates a buffer of this size --sql-mode=name Sets the sql mode. Any combination of: REAL_AS_FLOAT, PIPES_AS_CONCAT, ANSI_QUOTES, IGNORE_SPACE, IGNORE_BAD_TABLE_OPTIONS, ONLY_FULL_GROUP_BY, NO_UNSIGNED_SUBTRACTION, NO_DIR_IN_CREATE, POSTGRESQL, ORACLE, MSSQL, DB2, MAXDB, NO_KEY_OPTIONS, NO_TABLE_OPTIONS, NO_FIELD_OPTIONS, MYSQL323, MYSQL40, ANSI, NO_AUTO_VALUE_ON_ZERO, NO_BACKSLASH_ESCAPES, STRICT_TRANS_TABLES, STRICT_ALL_TABLES, NO_ZERO_IN_DATE, NO_ZERO_DATE, ALLOW_INVALID_DATES, ERROR_FOR_DIVISION_BY_ZERO, TRADITIONAL, NO_AUTO_CREATE_USER, HIGH_NOT_PRECEDENCE, NO_ENGINE_SUBSTITUTION, PAD_CHAR_TO_FULL_LENGTH --ssl Enable SSL for connection (automatically enabled if an ssl option is used). --ssl-ca=name CA file in PEM format (check OpenSSL docs, implies --ssl) --ssl-capath=name CA directory (check OpenSSL docs, implies --ssl) --ssl-cert=name X509 cert in PEM format (implies --ssl) --ssl-cipher=name SSL cipher to use (implies --ssl) --ssl-crl=name CRL file in PEM format (check OpenSSL docs, implies --ssl) --ssl-crlpath=name CRL directory (check OpenSSL docs, implies --ssl) --ssl-key=name X509 key in PEM format (implies --ssl) --stack-trace Print a symbolic stack trace on failure (Defaults to on; use --skip-stack-trace to disable.) --standard-compliant-cte Allow only CTEs compliant to SQL standard (Defaults to on; use --skip-standard-compliant-cte to disable.) --stored-program-cache=# The soft upper limit for number of cached stored routines for one connection. --strict-password-validation When password validation plugins are enabled, reject passwords that cannot be validated (passwords specified as a hash) (Defaults to on; use --skip-strict-password-validation to disable.) --super-large-pages Enable support for super large pages. -s, --symbolic-links Enable symbolic link support. (Defaults to on; use --skip-symbolic-links to disable.) --sync-binlog=# Synchronously flush binary log to disk after every #th event. Use 0 (default) to disable synchronous flushing --sync-frm Sync .frm files to disk on creation (Defaults to on; use --skip-sync-frm to disable.) --sync-master-info=# Synchronously flush master info to disk after every #th event. Use 0 to disable synchronous flushing --sync-relay-log=# Synchronously flush relay log to disk after every #th event. Use 0 to disable synchronous flushing --sync-relay-log-info=# Synchronously flush relay log info to disk after every #th transaction. Use 0 to disable synchronous flushing --sysdate-is-now Non-default option to alias SYSDATE() to NOW() to make it safe-replicable. Since 5.0, SYSDATE() returns a `dynamic' value different for different invocations, even within the same statement. --table-cache=# Deprecated; use --table-open-cache instead. --table-definition-cache=# The number of cached table definitions --table-open-cache=# The number of cached open tables --table-open-cache-instances=# Maximum number of table cache instances --tc-heuristic-recover=name Decision to use in heuristic recover process. One of: OFF, COMMIT, ROLLBACK --temp-pool Using this option will cause most temporary files created to use a small set of names, rather than a unique name for each new file. (Defaults to on; use --skip-temp-pool to disable.) --thread-cache-size=# How many threads we should keep in a cache for reuse. These are freed after 5 minutes of idle time --thread-concurrency=# Permits the application to give the threads system a hint for the desired number of threads that should be run at the same time.This variable has no effect, and is deprecated. It will be removed in a future release. --thread-handling=name Define threads usage for handling queries. One of: one-thread-per-connection, no-threads, pool-of-threads --thread-pool-idle-timeout=# Timeout in seconds for an idle thread in the thread pool.Worker thread will be shut down after timeout --thread-pool-max-threads=# Maximum allowed number of worker threads in the thread pool --thread-pool-oversubscribe=# How many additional active worker threads in a group are allowed. --thread-pool-prio-kickup-timer=# The number of milliseconds before a dequeued low-priority statement is moved to the high-priority queue --thread-pool-priority=name Threadpool priority. High priority connections usually start executing earlier than low priority.If priority set to 'auto', the the actual priority(low or high) is determined based on whether or not connection is inside transaction. --thread-pool-size=# Number of thread groups in the pool. This parameter is roughly equivalent to maximum number of concurrently executing threads (threads in a waiting state do not count as executing). --thread-pool-stall-limit=# Maximum query execution time in milliseconds,before an executing non-yielding thread is considered stalled.If a worker thread is stalled, additional worker thread may be created to handle remaining clients. --thread-stack=# The stack size for each thread --time-format=name The TIME format (ignored) --timed-mutexes Specify whether to time mutexes. Deprecated, has no effect. --tmp-disk-table-size=# Max size for data for an internal temporary on-disk MyISAM or Aria table. --tmp-memory-table-size=# If an internal in-memory temporary table exceeds this size, MariaDB will automatically convert it to an on-disk MyISAM or Aria table. Same as tmp_table_size. --tmp-table-size=# Alias for tmp_memory_table_size. If an internal in-memory temporary table exceeds this size, MariaDB will automatically convert it to an on-disk MyISAM or Aria table. -t, --tmpdir=name Path for temporary files. Several paths may be specified, separated by a colon (:), in this case they are used in a round-robin fashion --transaction-alloc-block-size=# Allocation block size for transactions to be stored in binary log --transaction-isolation=name Default transaction isolation level. One of: READ-UNCOMMITTED, READ-COMMITTED, REPEATABLE-READ, SERIALIZABLE --transaction-prealloc-size=# Persistent buffer for transactions to be stored in binary log --transaction-read-only Default transaction access mode. True if transactions are read-only. --updatable-views-with-limit=name YES = Don't issue an error message (warning only) if a VIEW without presence of a key of the underlying table is used in queries with a LIMIT clause for updating. NO = Prohibit update of a VIEW, which does not contain a key of the underlying table and the query uses a LIMIT clause (usually get from GUI tools) --use-stat-tables=name Specifies how to use system statistics tables. One of: NEVER, COMPLEMENTARY, PREFERABLY -u, --user=name Run mysqld daemon as user. --user-variables[=name] Enable or disable user_variables plugin. One of: ON, OFF, FORCE (don't start if the plugin fails to load). --userstat Enables statistics gathering for USER_STATISTICS, CLIENT_STATISTICS, INDEX_STATISTICS and TABLE_STATISTICS tables in the INFORMATION_SCHEMA -v, --verbose Used with --help option for detailed help. -V, --version[=name] Output version information and exit. --wait-timeout=# The number of seconds the server waits for activity on a connection before closing it --wsrep-OSU-method[=name] Method for Online Schema Upgrade. One of: TOI, RSU --wsrep-auto-increment-control To automatically control the assignment of autoincrement variables (Defaults to on; use --skip-wsrep-auto-increment-control to disable.) --wsrep-causal-reads Setting this variable is equivalent to setting wsrep_sync_wait READ flag --wsrep-certify-nonPK Certify tables with no primary key (Defaults to on; use --skip-wsrep-certify-nonPK to disable.) --wsrep-cluster-address=name Address to initially connect to cluster --wsrep-cluster-name=name Name for the cluster --wsrep-convert-LOCK-to-trx To convert locking sessions into transactions --wsrep-data-home-dir=name home directory for wsrep provider --wsrep-dbug-option=name DBUG options to provider library --wsrep-debug To enable debug level logging --wsrep-desync To desynchronize the node from the cluster --wsrep-dirty-reads Allow reads even when the node is not in the primary component. --wsrep-drupal-282555-workaround Enable a workaround to handle the cases where inserting a DEFAULT value into an auto-increment column could fail with duplicate key error --wsrep-forced-binlog-format=name binlog format to take effect over user's choice. One of: MIXED, STATEMENT, ROW, NONE --wsrep-gtid-domain-id=# When wsrep_gtid_mode is set, this value is used as gtid_domain_id for galera transactions and also copied to the joiner nodes during state transfer. It is ignored, otherwise. --wsrep-gtid-mode Automatically update the (joiner) node's wsrep_gtid_domain_id value with that of donor's (received during state transfer) and use it in place of gtid_domain_id for all galera transactions. When OFF (default), wsrep_gtid_domain_id is simply ignored (backward compatibility). --wsrep-load-data-splitting To commit LOAD DATA transaction after every 10K rows inserted (Defaults to on; use --skip-wsrep-load-data-splitting to disable.) --wsrep-log-conflicts To log multi-master conflicts --wsrep-max-ws-rows=# Max number of rows in write set --wsrep-max-ws-size=# Max write set size (bytes) --wsrep-mysql-replication-bundle=# mysql replication group commit --wsrep-new-cluster Bootstrap a cluster. It works by overriding the current value of wsrep_cluster_address. It is recommended not to add this option to the config file as this will trigger bootstrap on every server start. --wsrep-node-address=name Specifies the node's network address, in the format ip address[:port]. Used in situations where autoguessing is not reliable. As of MariaDB 10.1.8, supports IPv6. --wsrep-node-incoming-address=name Client connection address --wsrep-node-name=name Name of this node. This name can be used in wsrep_sst_donor as a preferred donor. Note that multiple nodes in a cluster can have the same name. --wsrep-notify-cmd=name --wsrep-on To enable wsrep replication --wsrep-provider=name Path to replication provider library --wsrep-provider-options=name Semicolon (;) separated list of wsrep options (see wsrep_provider_options documentation). --wsrep-recover Recover database state after crash and exit --wsrep-reject-queries[=name] Variable to set to reject queries. One of: NONE, ALL, ALL_KILL --wsrep-replicate-myisam To enable myisam replication --wsrep-restart-slave Should MariaDB slave be restarted automatically, when node joins back to cluster --wsrep-retry-autocommit=# Max number of times to retry a failed autocommit statement --wsrep-slave-FK-checks Should slave thread do foreign key constraint checks (Defaults to on; use --skip-wsrep-slave-FK-checks to disable.) --wsrep-slave-UK-checks Should slave thread do secondary index uniqueness checks --wsrep-slave-threads=# Number of slave appliers to launch --wsrep-sst-auth=name Authentication for SST connection --wsrep-sst-donor=name preferred donor node for the SST --wsrep-sst-donor-rejects-queries Reject client queries when donating state snapshot transfer --wsrep-sst-method=name State snapshot transfer method --wsrep-sst-receive-address=name Address where node is waiting for SST contact --wsrep-start-position=name global transaction position to start from --wsrep-sync-wait[=#] Ensure "synchronous" read view before executing an operation of the type specified by bitmask: 1 - READ(includes SELECT, SHOW and BEGIN/START TRANSACTION); 2 - UPDATE and DELETE; 4 - INSERT and REPLACE Variables (--variable-name=value) and boolean options {FALSE|TRUE} Value (after reading options) ---------------------------------------------------------- --------------- allow-suspicious-udfs FALSE aria ON aria-block-size 8192 aria-checkpoint-interval 30 aria-checkpoint-log-activity 1048576 aria-encrypt-tables FALSE aria-force-start-after-recovery-failures 0 aria-group-commit none aria-group-commit-interval 0 aria-log-dir-path /data/mysql/ aria-log-file-size 1073741824 aria-log-purge-type immediate aria-max-sort-file-size 9223372036853727232 aria-page-checksum TRUE aria-pagecache-age-threshold 300 aria-pagecache-buffer-size 134217728 aria-pagecache-division-limit 100 aria-pagecache-file-hash-size 512 aria-recover-options BACKUP,QUICK aria-repair-threads 1 aria-sort-buffer-size 268434432 aria-stats-method nulls_unequal aria-sync-log-dir NEWFILE auto-increment-increment 1 auto-increment-offset 1 autocommit TRUE automatic-sp-privileges TRUE back-log 80 basedir /usr/local/mariadb-10.2.19-linux-x86_64/ big-tables FALSE bind-address (No default value) binlog-annotate-row-events TRUE binlog-cache-size 32768 binlog-checksum CRC32 binlog-commit-wait-count 0 binlog-commit-wait-usec 100000 binlog-direct-non-transactional-updates FALSE binlog-format MIXED binlog-optimize-thread-scheduling TRUE binlog-row-event-max-size 8192 binlog-row-image FULL binlog-stmt-cache-size 32768 bulk-insert-buffer-size 8388608 character-set-client-handshake TRUE character-set-filesystem binary character-set-server latin1 character-sets-dir /usr/local/mariadb-10.2.19-linux-x86_64/share/charsets/ chroot (No default value) collation-server latin1_swedish_ci completion-type NO_CHAIN concurrent-insert AUTO connect-timeout 10 console FALSE datadir /data/mysql/ date-format %Y-%m-%d datetime-format %Y-%m-%d %H:%i:%s deadlock-search-depth-long 15 deadlock-search-depth-short 4 deadlock-timeout-long 50000000 deadlock-timeout-short 10000 debug debug-abort-slave-event-count 0 debug-disconnect-slave-event-count 0 debug-gdb FALSE debug-max-binlog-dump-events 0 debug-no-sync FALSE debug-no-thread-alarm FALSE debug-sporadic-binlog-dump-fail FALSE default-regex-flags default-storage-engine InnoDB default-time-zone (No default value) default-tmp-storage-engine (No default value) default-week-format 0 delay-key-write ON delayed-insert-limit 100 delayed-insert-timeout 300 delayed-queue-size 1000 des-key-file (No default value) div-precision-increment 4 encrypt-binlog FALSE encrypt-tmp-disk-tables FALSE encrypt-tmp-files FALSE enforce-storage-engine (No default value) eq-range-index-dive-limit 0 event-scheduler OFF expensive-subquery-limit 100 expire-logs-days 0 explicit-defaults-for-timestamp FALSE external-locking FALSE extra-max-connections 1 extra-port 0 feedback ON feedback-http-proxy (No default value) feedback-send-retry-wait 60 feedback-send-timeout 60 feedback-url https://mariadb.org/feedback_plugin/post feedback-user-info flashback FALSE flush FALSE flush-time 0 ft-boolean-syntax + -><()~*:""&| ft-max-word-len 84 ft-min-word-len 4 ft-query-expansion-limit 20 ft-stopword-file (No default value) gdb FALSE general-log FALSE general-log-file node105.log getopt-prefix-matching TRUE group-concat-max-len 1048576 gtid-domain-id 0 gtid-ignore-duplicates FALSE gtid-strict-mode FALSE help TRUE histogram-size 0 histogram-type SINGLE_PREC_HB host-cache-size 279 ignore-builtin-innodb FALSE ignore-db-dirs init-connect init-file (No default value) init-rpl-role MASTER init-slave innodb ON innodb-adaptive-flushing TRUE innodb-adaptive-flushing-lwm 10 innodb-adaptive-hash-index TRUE innodb-adaptive-hash-index-partitions 8 innodb-adaptive-hash-index-parts 8 innodb-adaptive-max-sleep-delay 150000 innodb-autoextend-increment 64 innodb-autoinc-lock-mode 1 innodb-background-scrub-data-check-interval 3600 innodb-background-scrub-data-compressed FALSE innodb-background-scrub-data-interval 604800 innodb-background-scrub-data-uncompressed FALSE innodb-buf-dump-status-frequency 0 innodb-buffer-page ON innodb-buffer-page-lru ON innodb-buffer-pool-chunk-size 134217728 innodb-buffer-pool-dump-at-shutdown TRUE innodb-buffer-pool-dump-now FALSE innodb-buffer-pool-dump-pct 25 innodb-buffer-pool-filename ib_buffer_pool innodb-buffer-pool-instances 0 innodb-buffer-pool-load-abort FALSE innodb-buffer-pool-load-at-startup TRUE innodb-buffer-pool-load-now FALSE innodb-buffer-pool-populate FALSE innodb-buffer-pool-size 134217728 innodb-buffer-pool-stats ON innodb-change-buffer-max-size 25 innodb-change-buffering all innodb-checksum-algorithm crc32 innodb-checksums TRUE innodb-cleaner-lsn-age-factor DEPRECATED innodb-cmp ON innodb-cmp-per-index ON innodb-cmp-per-index-enabled FALSE innodb-cmp-per-index-reset ON innodb-cmp-reset ON innodb-cmpmem ON innodb-cmpmem-reset ON innodb-commit-concurrency 0 innodb-compression-algorithm zlib innodb-compression-default FALSE innodb-compression-failure-threshold-pct 5 innodb-compression-level 6 innodb-compression-pad-pct-max 50 innodb-concurrency-tickets 5000 innodb-corrupt-table-action deprecated innodb-data-file-path (No default value) innodb-data-home-dir (No default value) innodb-deadlock-detect TRUE innodb-default-encryption-key-id 1 innodb-default-row-format dynamic innodb-defragment FALSE innodb-defragment-fill-factor 0.9 innodb-defragment-fill-factor-n-recs 20 innodb-defragment-frequency 40 innodb-defragment-n-pages 7 innodb-defragment-stats-accuracy 0 innodb-disable-sort-file-cache FALSE innodb-doublewrite TRUE innodb-empty-free-list-algorithm DEPRECATED innodb-encrypt-log FALSE innodb-encrypt-tables OFF innodb-encryption-rotate-key-age 1 innodb-encryption-rotation-iops 100 innodb-encryption-threads 0 innodb-fake-changes FALSE innodb-fast-shutdown 1 innodb-fatal-semaphore-wait-threshold 600 innodb-file-format Barracuda innodb-file-format-check TRUE innodb-file-format-max Antelope innodb-file-io-threads 0 innodb-file-per-table TRUE innodb-fill-factor 100 innodb-flush-log-at-timeout 1 innodb-flush-log-at-trx-commit 1 innodb-flush-method (No default value) innodb-flush-neighbors 1 innodb-flush-sync TRUE innodb-flushing-avg-loops 30 innodb-force-load-corrupted FALSE innodb-force-primary-key FALSE innodb-force-recovery 0 innodb-foreground-preflush DEPRECATED innodb-ft-aux-table (No default value) innodb-ft-being-deleted ON innodb-ft-cache-size 8000000 innodb-ft-config ON innodb-ft-default-stopword ON innodb-ft-deleted ON innodb-ft-enable-diag-print FALSE innodb-ft-enable-stopword TRUE innodb-ft-index-cache ON innodb-ft-index-table ON innodb-ft-max-token-size 84 innodb-ft-min-token-size 3 innodb-ft-num-word-optimize 2000 innodb-ft-result-cache-limit 2000000000 innodb-ft-server-stopword-table (No default value) innodb-ft-sort-pll-degree 2 innodb-ft-total-cache-size 640000000 innodb-ft-user-stopword-table (No default value) innodb-idle-flush-pct 100 innodb-immediate-scrub-data-uncompressed FALSE innodb-instrument-semaphores FALSE innodb-io-capacity 200 innodb-io-capacity-max 18446744073709551615 innodb-kill-idle-transaction 0 innodb-large-prefix TRUE innodb-lock-schedule-algorithm fcfs innodb-lock-wait-timeout 50 innodb-lock-waits ON innodb-locking-fake-changes FALSE innodb-locks ON innodb-locks-unsafe-for-binlog FALSE innodb-log-arch-dir (No default value) innodb-log-arch-expire-sec 0 innodb-log-archive FALSE innodb-log-block-size 0 innodb-log-buffer-size 16777216 innodb-log-checksum-algorithm DEPRECATED innodb-log-checksums TRUE innodb-log-compressed-pages TRUE innodb-log-file-size 50331648 innodb-log-files-in-group 2 innodb-log-group-home-dir (No default value) innodb-log-optimize-ddl TRUE innodb-log-write-ahead-size 8192 innodb-lru-scan-depth 1024 innodb-max-bitmap-file-size 0 innodb-max-changed-pages 0 innodb-max-dirty-pages-pct 75 innodb-max-dirty-pages-pct-lwm 0 innodb-max-purge-lag 0 innodb-max-purge-lag-delay 0 innodb-max-undo-log-size 10485760 innodb-metrics ON innodb-mirrored-log-groups 0 innodb-monitor-disable (No default value) innodb-monitor-enable (No default value) innodb-monitor-reset (No default value) innodb-monitor-reset-all (No default value) innodb-mtflush-threads 8 innodb-mutexes ON innodb-old-blocks-pct 37 innodb-old-blocks-time 1000 innodb-online-alter-log-max-size 134217728 innodb-open-files 0 innodb-optimize-fulltext-only FALSE innodb-page-cleaners 4 innodb-page-size 16384 innodb-prefix-index-cluster-optimization FALSE innodb-print-all-deadlocks FALSE innodb-purge-batch-size 300 innodb-purge-rseg-truncate-frequency 128 innodb-purge-threads 4 innodb-random-read-ahead FALSE innodb-read-ahead-threshold 56 innodb-read-io-threads 4 innodb-read-only FALSE innodb-replication-delay 0 innodb-rollback-on-timeout FALSE innodb-rollback-segments 128 innodb-safe-truncate TRUE innodb-sched-priority-cleaner 0 innodb-scrub-log FALSE innodb-scrub-log-speed 256 innodb-show-locks-held 0 innodb-show-verbose-locks 0 innodb-sort-buffer-size 1048576 innodb-spin-wait-delay 6 innodb-stats-auto-recalc TRUE innodb-stats-include-delete-marked FALSE innodb-stats-method nulls_equal innodb-stats-modified-counter 0 innodb-stats-on-metadata FALSE innodb-stats-persistent TRUE innodb-stats-persistent-sample-pages 20 innodb-stats-sample-pages 8 innodb-stats-traditional TRUE innodb-stats-transient-sample-pages 8 innodb-status-file FALSE innodb-status-output FALSE innodb-status-output-locks FALSE innodb-strict-mode TRUE innodb-support-xa TRUE innodb-sync-array-size 1 innodb-sync-spin-loops 30 innodb-sys-columns ON innodb-sys-datafiles ON innodb-sys-fields ON innodb-sys-foreign ON innodb-sys-foreign-cols ON innodb-sys-indexes ON innodb-sys-semaphore-waits ON innodb-sys-tables ON innodb-sys-tablespaces ON innodb-sys-tablestats ON innodb-sys-virtual ON innodb-table-locks TRUE innodb-tablespaces-encryption ON innodb-tablespaces-scrubbing ON innodb-temp-data-file-path (No default value) innodb-thread-concurrency 0 innodb-thread-sleep-delay 10000 innodb-tmpdir (No default value) innodb-track-changed-pages FALSE innodb-track-redo-log-now FALSE innodb-trx ON innodb-undo-directory (No default value) innodb-undo-log-truncate FALSE innodb-undo-logs 128 innodb-undo-tablespaces 0 innodb-use-atomic-writes TRUE innodb-use-fallocate FALSE innodb-use-global-flush-log-at-trx-commit FALSE innodb-use-mtflush FALSE innodb-use-native-aio TRUE innodb-use-stacktrace FALSE innodb-use-trim TRUE innodb-write-io-threads 4 interactive-timeout 28800 join-buffer-size 262144 join-buffer-space-limit 2097152 join-cache-level 2 keep-files-on-create FALSE key-buffer-size 402653184 key-cache-age-threshold 300 key-cache-block-size 1024 key-cache-division-limit 100 key-cache-file-hash-size 512 key-cache-segments 0 large-files-support TRUE large-pages FALSE lc-messages en_US lc-messages-dir (No default value) lc-time-names en_US local-infile TRUE lock-wait-timeout 86400 log-basename node105.yinzhengjie.org.cn log-bin mysql-bin log-bin-compress FALSE log-bin-compress-min-len 256 log-bin-index (No default value) log-bin-trust-function-creators FALSE log-error log-isam myisam.log log-output FILE log-queries-not-using-indexes FALSE log-short-format FALSE log-slave-updates FALSE log-slow-admin-statements TRUE log-slow-filter admin,filesort,filesort_on_disk,full_join,full_scan,query_cache,query_cache_miss,tmp_t able,tmp_table_on_disk log-slow-rate-limit 1 log-slow-slave-statements TRUE log-slow-verbosity log-tc tc.log log-tc-size 24576 log-warnings 2 long-query-time 10 low-priority-updates FALSE lower-case-file-system FALSE lower-case-table-names 0 master-info-file master.info master-retry-count 86400 master-verify-checksum FALSE max-allowed-packet 1048576 max-binlog-cache-size 18446744073709547520 max-binlog-size 1073741824 max-binlog-stmt-cache-size 18446744073709547520 max-connect-errors 100 max-connections 151 max-delayed-threads 20 max-digest-length 1024 max-error-count 64 max-heap-table-size 16777216 max-join-size 18446744073709551615 max-length-for-sort-data 1024 max-long-data-size 1048576 max-prepared-stmt-count 16382 max-recursive-iterations 4294967295 max-relay-log-size 1073741824 max-seeks-for-key 4294967295 max-session-mem-used 9223372036854775807 max-sort-length 1024 max-sp-recursion-depth 0 max-statement-time 0 max-tmp-tables 32 max-user-connections 0 max-write-lock-count 4294967295 memlock FALSE metadata-locks-cache-size 1024 metadata-locks-hash-instances 8 min-examined-row-limit 0 mrr-buffer-size 262144 multi-range-count 256 myisam-block-size 1024 myisam-data-pointer-size 6 myisam-max-sort-file-size 9223372036853727232 myisam-mmap-size 18446744073709551615 myisam-recover-options BACKUP,QUICK myisam-repair-threads 1 myisam-sort-buffer-size 67108864 myisam-stats-method NULLS_UNEQUAL myisam-use-mmap FALSE mysql56-temporal-format TRUE net-buffer-length 16384 net-read-timeout 30 net-retry-count 10 net-write-timeout 60 old FALSE old-alter-table FALSE old-mode old-passwords FALSE old-style-user-limits FALSE open-files-limit 1048576 optimizer-prune-level 1 optimizer-search-depth 62 optimizer-selectivity-sampling-limit 100 optimizer-switch index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection =on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch= on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off ,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_b ka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=on,exists_to_in=on,orderby_uses_equalities=on,condition_pushdown_for_deriv ed=on optimizer-use-condition-selectivity 1 partition ON performance-schema FALSE performance-schema-accounts-size -1 performance-schema-consumer-events-stages-current FALSE performance-schema-consumer-events-stages-history FALSE performance-schema-consumer-events-stages-history-long FALSE performance-schema-consumer-events-statements-current TRUE performance-schema-consumer-events-statements-history FALSE performance-schema-consumer-events-statements-history-long FALSE performance-schema-consumer-events-waits-current FALSE performance-schema-consumer-events-waits-history FALSE performance-schema-consumer-events-waits-history-long FALSE performance-schema-consumer-global-instrumentation TRUE performance-schema-consumer-statements-digest TRUE performance-schema-consumer-thread-instrumentation TRUE performance-schema-digests-size -1 performance-schema-events-stages-history-long-size -1 performance-schema-events-stages-history-size -1 performance-schema-events-statements-history-long-size -1 performance-schema-events-statements-history-size -1 performance-schema-events-waits-history-long-size -1 performance-schema-events-waits-history-size -1 performance-schema-hosts-size -1 performance-schema-instrument performance-schema-max-cond-classes 80 performance-schema-max-cond-instances -1 performance-schema-max-digest-length 1024 performance-schema-max-file-classes 50 performance-schema-max-file-handles 32768 performance-schema-max-file-instances -1 performance-schema-max-mutex-classes 200 performance-schema-max-mutex-instances -1 performance-schema-max-rwlock-classes 40 performance-schema-max-rwlock-instances -1 performance-schema-max-socket-classes 10 performance-schema-max-socket-instances -1 performance-schema-max-stage-classes 150 performance-schema-max-statement-classes 188 performance-schema-max-table-handles -1 performance-schema-max-table-instances -1 performance-schema-max-thread-classes 50 performance-schema-max-thread-instances -1 performance-schema-session-connect-attrs-size -1 performance-schema-setup-actors-size 100 performance-schema-setup-objects-size 100 performance-schema-users-size -1 pid-file /data/mysql/node105.pid plugin-dir /usr/local/mariadb-10.2.19-linux-x86_64/lib/plugin/ plugin-maturity unknown port 3306 port-open-timeout 0 preload-buffer-size 32768 profiling-history-size 15 progress-report-time 5 protocol-version 10 query-alloc-block-size 16384 query-cache-limit 1048576 query-cache-min-res-unit 4096 query-cache-size 33554432 query-cache-strip-comments FALSE query-cache-type ON query-cache-wlock-invalidate FALSE query-prealloc-size 24576 range-alloc-block-size 4096 read-binlog-speed-limit 0 read-buffer-size 2097152 read-only FALSE read-rnd-buffer-size 8388608 relay-log (No default value) relay-log-index (No default value) relay-log-info-file relay-log.info relay-log-purge TRUE relay-log-recovery FALSE relay-log-space-limit 0 replicate-annotate-row-events TRUE replicate-events-marked-for-skip REPLICATE replicate-same-server-id FALSE report-host (No default value) report-password (No default value) report-port 0 report-user (No default value) rowid-merge-buff-size 8388608 safe-user-create FALSE secure-auth TRUE secure-file-priv (No default value) sequence ON server-id 1 session-track-schema TRUE session-track-state-change FALSE session-track-system-variables session-track-transaction-info OFF show-slave-auth-info FALSE silent-startup FALSE skip-grant-tables FALSE skip-name-resolve FALSE skip-networking FALSE skip-show-database FALSE skip-slave-start FALSE slave-compressed-protocol FALSE slave-ddl-exec-mode IDEMPOTENT slave-domain-parallel-threads 0 slave-exec-mode STRICT slave-load-tmpdir /tmp slave-max-allowed-packet 1073741824 slave-net-timeout 60 slave-parallel-max-queued 131072 slave-parallel-mode conservative slave-parallel-threads 0 slave-parallel-workers 0 slave-run-triggers-for-rbr NO slave-skip-errors (No default value) slave-sql-verify-checksum TRUE slave-transaction-retries 10 slave-type-conversions slow-launch-time 2 slow-query-log FALSE slow-query-log-file node105-slow.log socket /tmp/mysql.sock sort-buffer-size 2097152 sql-mode STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUT ION ssl FALSE ssl-ca (No default value) ssl-capath (No default value) ssl-cert (No default value) ssl-cipher (No default value) ssl-crl (No default value) ssl-crlpath (No default value) ssl-key (No default value) stack-trace TRUE standard-compliant-cte TRUE stored-program-cache 256 strict-password-validation TRUE super-large-pages FALSE symbolic-links FALSE sync-binlog 0 sync-frm TRUE sync-master-info 10000 sync-relay-log 10000 sync-relay-log-info 10000 sysdate-is-now FALSE system-time-zone CST table-cache 512 table-definition-cache 400 table-open-cache 512 table-open-cache-instances 8 tc-heuristic-recover OFF temp-pool TRUE thread-cache-size 8 thread-concurrency 8 thread-handling one-thread-per-connection thread-pool-idle-timeout 60 thread-pool-max-threads 65536 thread-pool-oversubscribe 3 thread-pool-prio-kickup-timer 1000 thread-pool-priority auto thread-pool-size 1 thread-pool-stall-limit 500 thread-stack 299008 time-format %H:%i:%s timed-mutexes FALSE tmp-disk-table-size 18446744073709551615 tmp-memory-table-size 16777216 tmp-table-size 16777216 tmpdir /tmp transaction-alloc-block-size 8192 transaction-isolation REPEATABLE-READ transaction-prealloc-size 4096 transaction-read-only FALSE updatable-views-with-limit YES use-stat-tables NEVER user-variables ON userstat FALSE verbose TRUE version 10.2.19-MariaDB-log version-comment MariaDB Server version-compile-machine x86_64 version-compile-os Linux version-malloc-library system version-ssl-library YaSSL 2.4.4 wait-timeout 28800 wsrep-OSU-method TOI wsrep-auto-increment-control TRUE wsrep-causal-reads FALSE wsrep-certify-nonPK TRUE wsrep-cluster-address wsrep-cluster-name my_wsrep_cluster wsrep-convert-LOCK-to-trx FALSE wsrep-data-home-dir /data/mysql/ wsrep-dbug-option wsrep-debug FALSE wsrep-desync FALSE wsrep-dirty-reads FALSE wsrep-drupal-282555-workaround FALSE wsrep-forced-binlog-format NONE wsrep-gtid-domain-id 0 wsrep-gtid-mode FALSE wsrep-load-data-splitting TRUE wsrep-log-conflicts FALSE wsrep-max-ws-rows 0 wsrep-max-ws-size 2147483647 wsrep-mysql-replication-bundle 0 wsrep-new-cluster FALSE wsrep-node-address wsrep-node-incoming-address AUTO wsrep-node-name node105.yinzhengjie.org.cn wsrep-notify-cmd wsrep-on FALSE wsrep-patch-version wsrep_25.23 wsrep-provider none wsrep-provider-options wsrep-recover FALSE wsrep-reject-queries NONE wsrep-replicate-myisam FALSE wsrep-restart-slave FALSE wsrep-retry-autocommit 1 wsrep-log-conflicts FALSE wsrep-max-ws-rows 0 wsrep-max-ws-size 2147483647 wsrep-mysql-replication-bundle 0 wsrep-new-cluster FALSE wsrep-node-address wsrep-node-incoming-address AUTO wsrep-node-name node105.yinzhengjie.org.cn wsrep-notify-cmd wsrep-on FALSE wsrep-patch-version wsrep_25.23 wsrep-provider none wsrep-provider-options wsrep-recover FALSE wsrep-reject-queries NONE wsrep-replicate-myisam FALSE wsrep-restart-slave FALSE wsrep-retry-autocommit 1 wsrep-slave-FK-checks TRUE wsrep-slave-UK-checks FALSE wsrep-slave-threads 1 wsrep-sst-auth (No default value) wsrep-sst-donor wsrep-sst-donor-rejects-queries FALSE wsrep-sst-method rsync wsrep-sst-receive-address AUTO wsrep-start-position 00000000-0000-0000-0000-000000000000:-1 wsrep-sync-wait 0 To see what values a running MySQL server is using, type 'mysqladmin variables' instead of 'mysqld --verbose --help'. [root@node105.yinzhengjie.org.cn ~]#
[root@node105.yinzhengjie.org.cn ~]# mysqld --print-defaults #获取默认设置 mysqld would have been started with the following arguments: --datadir=/var/lib/mysql --socket=/var/lib/mysql/mysql.sock --symbolic-links=0 --datadir=/data/mysql --port=3306 --socket=/tmp/mysql.sock --skip- external-locking --key_buffer_size=384M --max_allowed_packet=1M --table_open_cache=512 --sort_buffer_size=2M --read_buffer_size=2M --read_rnd_buffer_size=8M --myisam_sort_buffer_size=64M --thread_cache_size=8 --query_cache_size=32M --thread_concurrency=8 --log-bin=mysql-bin --server-id=1
[root@node105.yinzhengjie.org.cn ~]#
3>.设置服务器选项方法
[root@node105.yinzhengjie.org.cn ~]# /usr/local/mysql/bin/mysqld_safe --skip-name-resolve=1 --defaults-file=/mysql/3306/etc/my.cnf &> /dev/null & [1] 14749 [root@node105.yinzhengjie.org.cn ~]#
[root@node105.yinzhengjie.org.cn ~]# cat /mysql/3306/etc/my.cnf [mysqld] character-set-server = utf8mb4 default_storage_engine = InnoDB skip_name_resolve = 1 port = 3306 datadir = /mysql/3306/data socket = /mysql/3306/socket/mysql.sock [mysqld_safe] log-error = /mysql/3306/log/mariadb.log pid-file = /mysql/3306/pid/mariadb.pid [root@node105.yinzhengjie.org.cn ~]# [root@node105.yinzhengjie.org.cn ~]#
4>.获取系统变量（分全局和会话两种）
MariaDB [yinzhengjie]> SHOW GLOBAL VARIABLESG ...... *************************** 600. row *************************** Variable_name: wsrep_node_incoming_address Value: AUTO *************************** 601. row *************************** Variable_name: wsrep_node_name Value: node105.yinzhengjie.org.cn *************************** 602. row *************************** Variable_name: wsrep_notify_cmd Value: *************************** 603. row *************************** Variable_name: wsrep_on Value: OFF *************************** 604. row *************************** Variable_name: wsrep_patch_version Value: wsrep_25.23 *************************** 605. row *************************** Variable_name: wsrep_provider Value: none *************************** 606. row *************************** Variable_name: wsrep_provider_options Value: *************************** 607. row *************************** Variable_name: wsrep_recover Value: OFF *************************** 608. row *************************** Variable_name: wsrep_reject_queries Value: NONE *************************** 609. row *************************** Variable_name: wsrep_replicate_myisam Value: OFF *************************** 610. row *************************** Variable_name: wsrep_restart_slave Value: OFF *************************** 611. row *************************** Variable_name: wsrep_retry_autocommit Value: 1 *************************** 612. row *************************** Variable_name: wsrep_slave_fk_checks Value: ON *************************** 613. row *************************** Variable_name: wsrep_slave_uk_checks Value: OFF *************************** 614. row *************************** Variable_name: wsrep_slave_threads Value: 1 *************************** 615. row *************************** Variable_name: wsrep_sst_auth Value: *************************** 616. row *************************** Variable_name: wsrep_sst_donor Value: *************************** 617. row *************************** Variable_name: wsrep_sst_donor_rejects_queries Value: OFF *************************** 618. row *************************** Variable_name: wsrep_sst_method Value: rsync *************************** 619. row *************************** Variable_name: wsrep_sst_receive_address Value: AUTO *************************** 620. row *************************** Variable_name: wsrep_start_position Value: 00000000-0000-0000-0000-000000000000:-1 *************************** 621. row *************************** Variable_name: wsrep_sync_wait Value: 0 621 rows in set (0.00 sec) MariaDB [yinzhengjie]>
MariaDB [yinzhengjie]> SHOW SESSION VARIABLESG ...... *************************** 600. row *************************** Variable_name: wsrep_cluster_address Value: *************************** 601. row *************************** Variable_name: wsrep_cluster_name Value: my_wsrep_cluster *************************** 602. row *************************** Variable_name: wsrep_convert_lock_to_trx Value: OFF *************************** 603. row *************************** Variable_name: wsrep_data_home_dir Value: /mysql/3306/data/ *************************** 604. row *************************** Variable_name: wsrep_dbug_option Value: *************************** 605. row *************************** Variable_name: wsrep_debug Value: OFF *************************** 606. row *************************** Variable_name: wsrep_desync Value: OFF *************************** 607. row *************************** Variable_name: wsrep_dirty_reads Value: OFF *************************** 608. row *************************** Variable_name: wsrep_drupal_282555_workaround Value: OFF *************************** 609. row *************************** Variable_name: wsrep_forced_binlog_format Value: NONE *************************** 610. row *************************** Variable_name: wsrep_gtid_domain_id Value: 0 *************************** 611. row *************************** Variable_name: wsrep_gtid_mode Value: OFF *************************** 612. row *************************** Variable_name: wsrep_load_data_splitting Value: ON *************************** 613. row *************************** Variable_name: wsrep_log_conflicts Value: OFF *************************** 614. row *************************** Variable_name: wsrep_max_ws_rows Value: 0 *************************** 615. row *************************** Variable_name: wsrep_max_ws_size Value: 2147483647 *************************** 616. row *************************** Variable_name: wsrep_mysql_replication_bundle Value: 0 *************************** 617. row *************************** Variable_name: wsrep_node_address Value: *************************** 618. row *************************** Variable_name: wsrep_node_incoming_address Value: AUTO *************************** 619. row *************************** Variable_name: wsrep_node_name Value: node105.yinzhengjie.org.cn *************************** 620. row *************************** Variable_name: wsrep_notify_cmd Value: *************************** 621. row *************************** Variable_name: wsrep_on Value: OFF *************************** 622. row *************************** Variable_name: wsrep_patch_version Value: wsrep_25.23 *************************** 623. row *************************** Variable_name: wsrep_provider Value: none *************************** 624. row *************************** Variable_name: wsrep_provider_options Value: *************************** 625. row *************************** Variable_name: wsrep_recover Value: OFF *************************** 626. row *************************** Variable_name: wsrep_reject_queries Value: NONE *************************** 627. row *************************** Variable_name: wsrep_replicate_myisam Value: OFF *************************** 628. row *************************** Variable_name: wsrep_restart_slave Value: OFF *************************** 629. row *************************** Variable_name: wsrep_retry_autocommit Value: 1 *************************** 630. row *************************** Variable_name: wsrep_slave_fk_checks Value: ON *************************** 631. row *************************** Variable_name: wsrep_slave_uk_checks Value: OFF *************************** 632. row *************************** Variable_name: wsrep_slave_threads Value: 1 *************************** 633. row *************************** Variable_name: wsrep_sst_auth Value: *************************** 634. row *************************** Variable_name: wsrep_sst_donor Value: *************************** 635. row *************************** Variable_name: wsrep_sst_donor_rejects_queries Value: OFF *************************** 636. row *************************** Variable_name: wsrep_sst_method Value: rsync *************************** 637. row *************************** Variable_name: wsrep_sst_receive_address Value: AUTO *************************** 638. row *************************** Variable_name: wsrep_start_position Value: 00000000-0000-0000-0000-000000000000:-1 *************************** 639. row *************************** Variable_name: wsrep_sync_wait Value: 0 639 rows in set (0.00 sec) MariaDB [yinzhengjie]> MariaDB [yinzhengjie]>
MariaDB [yinzhengjie]> SHOW VARIABLES LIKE '%character%'; +--------------------------+---------------------------------------------------------+ | Variable_name | Value | +--------------------------+---------------------------------------------------------+ | character_set_client | utf8mb4 | | character_set_connection | utf8mb4 | | character_set_database | utf8 | | character_set_filesystem | binary | | character_set_results | utf8mb4 | | character_set_server | utf8mb4 | | character_set_system | utf8 | | character_sets_dir | /usr/local/mariadb-10.2.19-linux-x86_64/share/charsets/ | +--------------------------+---------------------------------------------------------+ 8 rows in set (0.00 sec) MariaDB [yinzhengjie]>
MariaDB [yinzhengjie]> SELECT @@character_set_server; #查看具体的会话系统变量名称 +------------------------+ | @@character_set_server | +------------------------+ | utf8mb4 | +------------------------+ row in set (0.00 sec) MariaDB [yinzhengjie]>
5>.修改服务器变量的值
MariaDB [yinzhengjie]> HELP SET Name: 'SET' Description: Syntax: SET variable_assignment [, variable_assignment] ... variable_assignment: user_var_name = expr | [GLOBAL | SESSION] system_var_name = expr | [@@global. | @@session. | @@]system_var_name = expr The SET statement assigns values to different types of variables that affect the operation of the server or your client. Older versions of MySQL employed SET OPTION, but this syntax is deprecated in favor of SET without OPTION. URL: https://mariadb.com/kb/en/set/ MariaDB [yinzhengjie]> MariaDB [yinzhengjie]>
MariaDB [yinzhengjie]> SELECT @@character_set_database; +--------------------------+ | @@character_set_database | +--------------------------+ | utf8 | +--------------------------+ row in set (0.00 sec) MariaDB [yinzhengjie]> MariaDB [yinzhengjie]> SET character_set_database = utf8mb4; #修改会话变量 Query OK, 0 rows affected (0.00 sec) MariaDB [yinzhengjie]> MariaDB [yinzhengjie]> SELECT @@character_set_database; +--------------------------+ | @@character_set_database | +--------------------------+ | utf8mb4 | +--------------------------+ row in set (0.00 sec) MariaDB [yinzhengjie]>
MariaDB [yinzhengjie]> SELECT @@character_set_database; +--------------------------+ | @@character_set_database | +--------------------------+ | utf8mb4 | +--------------------------+ 1 row in set (0.00 sec) MariaDB [yinzhengjie]> MariaDB [yinzhengjie]> SET SESSION character_set_database = utf8; #修改会话变量(同上,此处SESSION可用省略不写) Query OK, 0 rows affected (0.00 sec) MariaDB [yinzhengjie]> MariaDB [yinzhengjie]> SELECT @@character_set_database; +--------------------------+ | @@character_set_database | +--------------------------+ | utf8 | +--------------------------+ 1 row in set (0.00 sec) MariaDB [yinzhengjie]> MariaDB [yinzhengjie]>
MariaDB [yinzhengjie]> SELECT @@character_set_database; +--------------------------+ | @@character_set_database | +--------------------------+ | utf8 | +--------------------------+ 1 row in set (0.00 sec) MariaDB [yinzhengjie]> MariaDB [yinzhengjie]> SET @@character_set_database = utf8mb4; #修改会话变量 Query OK, 0 rows affected (0.00 sec) MariaDB [yinzhengjie]> MariaDB [yinzhengjie]> SELECT @@character_set_database; +--------------------------+ | @@character_set_database | +--------------------------+ | utf8mb4 | +--------------------------+ 1 row in set (0.00 sec) MariaDB [yinzhengjie]> MariaDB [yinzhengjie]>
MariaDB [yinzhengjie]> SELECT @@character_set_database; +--------------------------+ | @@character_set_database | +--------------------------+ | utf8mb4 | +--------------------------+ 1 row in set (0.00 sec) MariaDB [yinzhengjie]> MariaDB [yinzhengjie]> SET @@SESSION.character_set_database = utf8; #同上,此处"SESSION."可用省略不写 Query OK, 0 rows affected (0.00 sec) MariaDB [yinzhengjie]> MariaDB [yinzhengjie]> SELECT @@character_set_database; +--------------------------+ | @@character_set_database | +--------------------------+ | utf8 | +--------------------------+ 1 row in set (0.00 sec) MariaDB [yinzhengjie]> MariaDB [yinzhengjie]>
MariaDB [yinzhengjie]> SHOW GLOBAL VARIABLES LIKE '%character%'; +--------------------------+---------------------------------------------------------+ | Variable_name | Value | +--------------------------+---------------------------------------------------------+ | character_set_client | utf8mb4 | | character_set_connection | utf8mb4 | | character_set_database | utf8 | | character_set_filesystem | binary | | character_set_results | utf8mb4 | | character_set_server | utf8mb4 | | character_set_system | utf8 | | character_sets_dir | /usr/local/mariadb-10.2.19-linux-x86_64/share/charsets/ | +--------------------------+---------------------------------------------------------+ 8 rows in set (0.00 sec) MariaDB [yinzhengjie]> MariaDB [yinzhengjie]> SET GLOBAL character_set_server = gbk; #修改全局变量，仅对修改后新创建的会话有效;对已经建立的会话无效。 Query OK, 0 rows affected (0.00 sec) MariaDB [yinzhengjie]> MariaDB [yinzhengjie]> SHOW GLOBAL VARIABLES LIKE '%character%'; +--------------------------+---------------------------------------------------------+ | Variable_name | Value | +--------------------------+---------------------------------------------------------+ | character_set_client | utf8mb4 | | character_set_connection | utf8mb4 | | character_set_database | utf8 | | character_set_filesystem | binary | | character_set_results | utf8mb4 | | character_set_server | gbk | | character_set_system | utf8 | | character_sets_dir | /usr/local/mariadb-10.2.19-linux-x86_64/share/charsets/ | +--------------------------+---------------------------------------------------------+ 8 rows in set (0.00 sec) MariaDB [yinzhengjie]> MariaDB [yinzhengjie]>
MariaDB [yinzhengjie]> SHOW GLOBAL VARIABLES LIKE '%character%'; +--------------------------+---------------------------------------------------------+ | Variable_name | Value | +--------------------------+---------------------------------------------------------+ | character_set_client | utf8mb4 | | character_set_connection | utf8mb4 | | character_set_database | utf8 | | character_set_filesystem | binary | | character_set_results | utf8mb4 | | character_set_server | gbk | | character_set_system | utf8 | | character_sets_dir | /usr/local/mariadb-10.2.19-linux-x86_64/share/charsets/ | +--------------------------+---------------------------------------------------------+ 8 rows in set (0.00 sec) MariaDB [yinzhengjie]> MariaDB [yinzhengjie]> SET @@GLOBAL.character_set_server = utf8mb4; #修改全局变量,此处的"GLOBAL."可以省略不写 Query OK, 0 rows affected (0.01 sec) MariaDB [yinzhengjie]> MariaDB [yinzhengjie]> SHOW GLOBAL VARIABLES LIKE '%character%'; +--------------------------+---------------------------------------------------------+ | Variable_name | Value | +--------------------------+---------------------------------------------------------+ | character_set_client | utf8mb4 | | character_set_connection | utf8mb4 | | character_set_database | utf8 | | character_set_filesystem | binary | | character_set_results | utf8mb4 | | character_set_server | utf8mb4 | | character_set_system | utf8 | | character_sets_dir | /usr/local/mariadb-10.2.19-linux-x86_64/share/charsets/ | +--------------------------+---------------------------------------------------------+ 8 rows in set (0.00 sec) MariaDB [yinzhengjie]>
6>.查看服务器状态变量（分全局和会话两种,用于保存mysqld运行中的统计数据的变量，不可更改。）
MariaDB [yinzhengjie]> SHOW GLOBAL STATUS; #查看全局状态变量 +--------------------------------------------------------------+--------------------------------------------------+ | Variable_name | Value | +--------------------------------------------------------------+--------------------------------------------------+ | Aborted_clients | 0 | | Aborted_connects | 4 | | Access_denied_errors | 5 | | Acl_column_grants | 2 | | Acl_database_grants | 1 | | Acl_function_grants | 0 | | Acl_procedure_grants | 0 | | Acl_proxy_users | 2 | | Acl_role_grants | 0 | | Acl_roles | 0 | | Acl_table_grants | 1 | | Acl_users | 5 | | Aria_pagecache_blocks_not_flushed | 0 | | Aria_pagecache_blocks_unused | 15706 | | Aria_pagecache_blocks_used | 2 | | Aria_pagecache_read_requests | 12 | | Aria_pagecache_reads | 2 | | Aria_pagecache_write_requests | 4 | | Aria_pagecache_writes | 0 | | Aria_transaction_log_syncs | 0 | | Binlog_commits | 0 | | Binlog_group_commits | 0 | | Binlog_group_commit_trigger_count | 0 | | Binlog_group_commit_trigger_lock_wait | 0 | | Binlog_group_commit_trigger_timeout | 0 | | Binlog_snapshot_file | | | Binlog_snapshot_position | 0 | | Binlog_bytes_written | 0 | | Binlog_cache_disk_use | 0 | | Binlog_cache_use | 0 | | Binlog_stmt_cache_disk_use | 0 | | Binlog_stmt_cache_use | 0 | | Busy_time | 0.000000 | | Bytes_received | 7623 | | Bytes_sent | 402252 | | Com_admin_commands | 0 | | Com_alter_db | 0 | | Com_alter_db_upgrade | 0 | | Com_alter_event | 0 | | Com_alter_function | 0 | | Com_alter_procedure | 0 | | Com_alter_server | 0 | | Com_alter_table | 0 | | Com_alter_tablespace | 0 | | Com_alter_user | 0 | | Com_analyze | 0 | | Com_assign_to_keycache | 0 | | Com_begin | 0 | | Com_binlog | 0 | | Com_call_procedure | 0 | | Com_change_db | 8 | | Com_change_master | 0 | | Com_check | 0 | | Com_checksum | 0 | | Com_commit | 0 | | Com_compound_sql | 0 | | Com_create_db | 0 | | Com_create_event | 0 | | Com_create_function | 0 | | Com_create_index | 0 | | Com_create_procedure | 0 | | Com_create_role | 0 | | Com_create_server | 0 | | Com_create_table | 0 | | Com_create_temporary_table | 0 | | Com_create_trigger | 0 | | Com_create_udf | 0 | | Com_create_user | 0 | | Com_create_view | 0 | | Com_dealloc_sql | 0 | | Com_delete | 0 | | Com_delete_multi | 0 | | Com_do | 0 | | Com_drop_db | 0 | | Com_drop_event | 0 | | Com_drop_function | 0 | | Com_drop_index | 0 | | Com_drop_procedure | 0 | | Com_drop_role | 0 | | Com_drop_server | 0 | | Com_drop_table | 1 | | Com_drop_temporary_table | 0 | | Com_drop_trigger | 0 | | Com_drop_user | 0 | | Com_drop_view | 0 | | Com_empty_query | 0 | | Com_execute_immediate | 0 | | Com_execute_sql | 0 | | Com_flush | 2 | | Com_get_diagnostics | 0 | | Com_grant | 2 | | Com_grant_role | 0 | | Com_ha_close | 0 | | Com_ha_open | 0 | | Com_ha_read | 0 | | Com_help | 6 | | Com_insert | 0 | | Com_insert_select | 0 | | Com_install_plugin | 0 | | Com_kill | 0 | | Com_load | 0 | | Com_lock_tables | 0 | | Com_multi | 0 | | Com_optimize | 0 | | Com_preload_keys | 0 | | Com_prepare_sql | 0 | | Com_purge | 0 | | Com_purge_before_date | 0 | | Com_release_savepoint | 0 | | Com_rename_table | 0 | | Com_rename_user | 0 | | Com_repair | 0 | | Com_replace | 0 | | Com_replace_select | 0 | | Com_reset | 0 | | Com_resignal | 0 | | Com_revoke | 1 | | Com_revoke_all | 0 | | Com_revoke_role | 0 | | Com_rollback | 0 | | Com_rollback_to_savepoint | 0 | | Com_savepoint | 0 | | Com_select | 48 | | Com_set_option | 11 | | Com_show_authors | 0 | | Com_show_binlog_events | 0 | | Com_show_binlogs | 0 | | Com_show_charsets | 0 | | Com_show_collations | 0 | | Com_show_contributors | 0 | | Com_show_create_db | 0 | | Com_show_create_event | 0 | | Com_show_create_func | 0 | | Com_show_create_proc | 0 | | Com_show_create_table | 4 | | Com_show_create_trigger | 0 | | Com_show_create_user | 0 | | Com_show_databases | 9 | | Com_show_engine_logs | 0 | | Com_show_engine_mutex | 0 | | Com_show_engine_status | 0 | | Com_show_errors | 0 | | Com_show_events | 0 | | Com_show_explain | 0 | | Com_show_fields | 11 | | Com_show_function_status | 0 | | Com_show_generic | 0 | | Com_show_grants | 10 | | Com_show_keys | 0 | | Com_show_master_status | 0 | | Com_show_open_tables | 0 | | Com_show_plugins | 0 | | Com_show_privileges | 0 | | Com_show_procedure_status | 0 | | Com_show_processlist | 0 | | Com_show_profile | 0 | | Com_show_profiles | 0 | | Com_show_relaylog_events | 0 | | Com_show_slave_hosts | 0 | | Com_show_slave_status | 0 | | Com_show_status | 4 | | Com_show_storage_engines | 2 | | Com_show_table_status | 9 | | Com_show_tables | 10 | | Com_show_triggers | 0 | | Com_show_variables | 28 | | Com_show_warnings | 0 | | Com_shutdown | 0 | | Com_signal | 0 | | Com_start_all_slaves | 0 | | Com_start_slave | 0 | | Com_stmt_close | 0 | | Com_stmt_execute | 0 | | Com_stmt_fetch | 0 | | Com_stmt_prepare | 0 | | Com_stmt_reprepare | 0 | | Com_stmt_reset | 0 | | Com_stmt_send_long_data | 0 | | Com_stop_all_slaves | 0 | | Com_stop_slave | 0 | | Com_truncate | 0 | | Com_uninstall_plugin | 0 | | Com_unlock_tables | 0 | | Com_update | 3 | | Com_update_multi | 0 | | Com_xa_commit | 0 | | Com_xa_end | 0 | | Com_xa_prepare | 0 | | Com_xa_recover | 0 | | Com_xa_rollback | 0 | | Com_xa_start | 0 | | Compression | OFF | | Connection_errors_accept | 0 | | Connection_errors_internal | 0 | | Connection_errors_max_connections | 0 | | Connection_errors_peer_address | 0 | | Connection_errors_select | 0 | | Connection_errors_tcpwrap | 0 | | Connections | 17 | | Cpu_time | 0.000000 | | Created_tmp_disk_tables | 2 | | Created_tmp_files | 5 | | Created_tmp_tables | 62 | | Delayed_errors | 0 | | Delayed_insert_threads | 0 | | Delayed_writes | 0 | | Delete_scan | 0 | | Empty_queries | 1 | | Executed_events | 0 | | Executed_triggers | 0 | | Feature_check_constraint | 0 | | Feature_delay_key_write | 0 | | Feature_dynamic_columns | 0 | | Feature_fulltext | 0 | | Feature_gis | 0 | | Feature_locale | 0 | | Feature_subquery | 0 | | Feature_timezone | 0 | | Feature_trigger | 0 | | Feature_window_functions | 0 | | Feature_xml | 0 | | Flush_commands | 1 | | Handler_commit | 5 | | Handler_delete | 0 | | Handler_discover | 0 | | Handler_external_lock | 0 | | Handler_icp_attempts | 0 | | Handler_icp_match | 0 | | Handler_mrr_init | 0 | | Handler_mrr_key_refills | 0 | | Handler_mrr_rowid_refills | 0 | | Handler_prepare | 0 | | Handler_read_first | 7 | | Handler_read_key | 21 | | Handler_read_last | 0 | | Handler_read_next | 5 | | Handler_read_prev | 0 | | Handler_read_retry | 0 | | Handler_read_rnd | 0 | | Handler_read_rnd_deleted | 4 | | Handler_read_rnd_next | 10995 | | Handler_rollback | 2 | | Handler_savepoint | 0 | | Handler_savepoint_rollback | 0 | | Handler_tmp_update | 0 | | Handler_tmp_write | 10728 | | Handler_update | 3 | | Handler_write | 5 | | Innodb_buffer_pool_dump_status | | | Innodb_buffer_pool_load_status | Buffer pool(s) load completed at 191029 7:20:21 | | Innodb_buffer_pool_resize_status | | | Innodb_buffer_pool_pages_data | 499 | | Innodb_buffer_pool_bytes_data | 8175616 | | Innodb_buffer_pool_pages_dirty | 0 | | Innodb_buffer_pool_bytes_dirty | 0 | | Innodb_buffer_pool_pages_flushed | 152 | | Innodb_buffer_pool_pages_free | 7692 | | Innodb_buffer_pool_pages_misc | 0 | | Innodb_buffer_pool_pages_total | 8191 | | Innodb_buffer_pool_read_ahead_rnd | 0 | | Innodb_buffer_pool_read_ahead | 0 | | Innodb_buffer_pool_read_ahead_evicted | 0 | | Innodb_buffer_pool_read_requests | 2674 | | Innodb_buffer_pool_reads | 369 | | Innodb_buffer_pool_wait_free | 0 | | Innodb_buffer_pool_write_requests | 1168 | | Innodb_data_fsyncs | 27 | | Innodb_data_pending_fsyncs | 0 | | Innodb_data_pending_reads | 0 | | Innodb_data_pending_writes | 0 | | Innodb_data_read | 6113792 | | Innodb_data_reads | 390 | | Innodb_data_writes | 173 | | Innodb_data_written | 2846208 | | Innodb_dblwr_pages_written | 21 | | Innodb_dblwr_writes | 3 | | Innodb_log_waits | 0 | | Innodb_log_write_requests | 5 | | Innodb_log_writes | 12 | | Innodb_os_log_fsyncs | 18 | | Innodb_os_log_pending_fsyncs | 0 | | Innodb_os_log_pending_writes | 0 | | Innodb_os_log_written | 8704 | | Innodb_page_size | 16384 | | Innodb_pages_created | 131 | | Innodb_pages_read | 368 | | Innodb_pages0_read | 11 | | Innodb_pages_written | 152 | | Innodb_row_lock_current_waits | 0 | | Innodb_row_lock_time | 0 | | Innodb_row_lock_time_avg | 0 | | Innodb_row_lock_time_max | 0 | | Innodb_row_lock_waits | 0 | | Innodb_rows_deleted | 0 | | Innodb_rows_inserted | 0 | | Innodb_rows_read | 125 | | Innodb_rows_updated | 1 | | Innodb_system_rows_deleted | 0 | | Innodb_system_rows_inserted | 0 | | Innodb_system_rows_read | 0 | | Innodb_system_rows_updated | 0 | | Innodb_num_open_files | 13 | | Innodb_truncated_status_writes | 0 | | Innodb_available_undo_logs | 128 | | Innodb_undo_truncations | 0 | | Innodb_page_compression_saved | 0 | | Innodb_num_index_pages_written | 0 | | Innodb_num_non_index_pages_written | 0 | | Innodb_num_pages_page_compressed | 0 | | Innodb_num_page_compressed_trim_op | 0 | | Innodb_num_pages_page_decompressed | 0 | | Innodb_num_pages_page_compression_error | 0 | | Innodb_num_pages_encrypted | 0 | | Innodb_num_pages_decrypted | 0 | | Innodb_have_lz4 | OFF | | Innodb_have_lzo | OFF | | Innodb_have_lzma | OFF | | Innodb_have_bzip2 | OFF | | Innodb_have_snappy | OFF | | Innodb_have_punch_hole | OFF | | Innodb_defragment_compression_failures | 0 | | Innodb_defragment_failures | 0 | | Innodb_defragment_count | 0 | | Innodb_onlineddl_rowlog_rows | 0 | | Innodb_onlineddl_rowlog_pct_used | 0 | | Innodb_onlineddl_pct_progress | 0 | | Innodb_secondary_index_triggered_cluster_reads | 0 | | Innodb_secondary_index_triggered_cluster_reads_avoided | 0 | | Innodb_encryption_rotation_pages_read_from_cache | 0 | | Innodb_encryption_rotation_pages_read_from_disk | 0 | | Innodb_encryption_rotation_pages_modified | 0 | | Innodb_encryption_rotation_pages_flushed | 0 | | Innodb_encryption_rotation_estimated_iops | 0 | | Innodb_encryption_key_rotation_list_length | 0 | | Innodb_encryption_n_merge_blocks_encrypted | 0 | | Innodb_encryption_n_merge_blocks_decrypted | 0 | | Innodb_encryption_n_rowlog_blocks_encrypted | 0 | | Innodb_encryption_n_rowlog_blocks_decrypted | 0 | | Innodb_scrub_background_page_reorganizations | 0 | | Innodb_scrub_background_page_splits | 0 | | Innodb_scrub_background_page_split_failures_underflow | 0 | | Innodb_scrub_background_page_split_failures_out_of_filespace | 0 | | Innodb_scrub_background_page_split_failures_missing_index | 0 | | Innodb_scrub_background_page_split_failures_unknown | 0 | | Innodb_scrub_log | 0 | | Innodb_encryption_num_key_requests | 0 | | Key_blocks_not_flushed | 0 | | Key_blocks_unused | 107138 | | Key_blocks_used | 25 | | Key_blocks_warm | 0 | | Key_read_requests | 61 | | Key_reads | 12 | | Key_write_requests | 21 | | Key_writes | 17 | | Last_query_cost | 0.000000 | | Master_gtid_wait_count | 0 | | Master_gtid_wait_time | 0 | | Master_gtid_wait_timeouts | 0 | | Max_statement_time_exceeded | 0 | | Max_used_connections | 3 | | Memory_used | 291178416 | | Not_flushed_delayed_rows | 0 | | Open_files | 39 | | Open_streams | 0 | | Open_table_definitions | 31 | | Open_tables | 24 | | Opened_files | 111 | | Opened_plugin_libraries | 0 | | Opened_table_definitions | 31 | | Opened_tables | 31 | | Opened_views | 0 | | Performance_schema_accounts_lost | 0 | | Performance_schema_cond_classes_lost | 0 | | Performance_schema_cond_instances_lost | 0 | | Performance_schema_digest_lost | 0 | | Performance_schema_file_classes_lost | 0 | | Performance_schema_file_handles_lost | 0 | | Performance_schema_file_instances_lost | 0 | | Performance_schema_hosts_lost | 0 | | Performance_schema_locker_lost | 0 | | Performance_schema_mutex_classes_lost | 0 | | Performance_schema_mutex_instances_lost | 0 | | Performance_schema_rwlock_classes_lost | 0 | | Performance_schema_rwlock_instances_lost | 0 | | Performance_schema_session_connect_attrs_lost | 0 | | Performance_schema_socket_classes_lost | 0 | | Performance_schema_socket_instances_lost | 0 | | Performance_schema_stage_classes_lost | 0 | | Performance_schema_statement_classes_lost | 0 | | Performance_schema_table_handles_lost | 0 | | Performance_schema_table_instances_lost | 0 | | Performance_schema_thread_classes_lost | 0 | | Performance_schema_thread_instances_lost | 0 | | Performance_schema_users_lost | 0 | | Prepared_stmt_count | 0 | | Qcache_free_blocks | 1 | | Qcache_free_memory | 1031336 | | Qcache_hits | 0 | | Qcache_inserts | 0 | | Qcache_lowmem_prunes | 0 | | Qcache_not_cached | 0 | | Qcache_queries_in_cache | 0 | | Qcache_total_blocks | 1 | | Queries | 182 | | Questions | 182 | | Rows_read | 189 | | Rows_sent | 10893 | | Rows_tmp_read | 10728 | | Rpl_status | AUTH_MASTER | | Select_full_join | 0 | | Select_full_range_join | 0 | | Select_range | 0 | | Select_range_check | 0 | | Select_scan | 73 | | Slave_connections | 0 | | Slave_heartbeat_period | 0.000 | | Slave_open_temp_tables | 0 | | Slave_received_heartbeats | 0 | | Slave_retried_transactions | 0 | | Slave_running | OFF | | Slave_skipped_errors | 0 | | Slaves_connected | 0 | | Slaves_running | 0 | | Slow_launch_threads | 0 | | Slow_queries | 0 | | Sort_merge_passes | 0 | | Sort_priority_queue_sorts | 0 | | Sort_range | 0 | | Sort_rows | 0 | | Sort_scan | 0 | | Ssl_accept_renegotiates | 0 | | Ssl_accepts | 0 | | Ssl_callback_cache_hits | 0 | | Ssl_cipher | | | Ssl_cipher_list | | | Ssl_client_connects | 0 | | Ssl_connect_renegotiates | 0 | | Ssl_ctx_verify_depth | 0 | | Ssl_ctx_verify_mode | 0 | | Ssl_default_timeout | 0 | | Ssl_finished_accepts | 0 | | Ssl_finished_connects | 0 | | Ssl_server_not_after | | | Ssl_server_not_before | | | Ssl_session_cache_hits | 0 | | Ssl_session_cache_misses | 0 | | Ssl_session_cache_mode | NONE | | Ssl_session_cache_overflows | 0 | | Ssl_session_cache_size | 0 | | Ssl_session_cache_timeouts | 0 | | Ssl_sessions_reused | 0 | | Ssl_used_session_cache_entries | 0 | | Ssl_verify_depth | 0 | | Ssl_verify_mode | 0 | | Ssl_version | | | Subquery_cache_hit | 0 | | Subquery_cache_miss | 0 | | Syncs | 2 | | Table_locks_immediate | 80 | | Table_locks_waited | 0 | | Tc_log_max_pages_used | 0 | | Tc_log_page_size | 4096 | | Tc_log_page_waits | 0 | | Threadpool_idle_threads | 0 | | Threadpool_threads | 0 | | Threads_cached | 0 | | Threads_connected | 3 | | Threads_created | 4 | | Threads_running | 1 | | Update_scan | 1 | | Uptime | 29144 | | Uptime_since_flush_status | 29144 | | wsrep_cluster_conf_id | 18446744073709551615 | | wsrep_cluster_size | 0 | | wsrep_cluster_state_uuid | | | wsrep_cluster_status | Disconnected | | wsrep_connected | OFF | | wsrep_local_bf_aborts | 0 | | wsrep_local_index | 18446744073709551615 | | wsrep_provider_name | | | wsrep_provider_vendor | | | wsrep_provider_version | | | wsrep_ready | OFF | | wsrep_thread_count | 0 | +--------------------------------------------------------------+--------------------------------------------------+ 484 rows in set (0.00 sec) MariaDB [yinzhengjie]> MariaDB [yinzhengjie]>
MariaDB [yinzhengjie]> SHOW SESSION STATUS; #查看会话状态变量 +--------------------------------------------------------------+--------------------------------------------------+ | Variable_name | Value | +--------------------------------------------------------------+--------------------------------------------------+ | Aborted_clients | 0 | | Aborted_connects | 4 | | Access_denied_errors | 0 | | Acl_column_grants | 2 | | Acl_database_grants | 1 | | Acl_function_grants | 0 | | Acl_procedure_grants | 0 | | Acl_proxy_users | 2 | | Acl_role_grants | 0 | | Acl_roles | 0 | | Acl_table_grants | 1 | | Acl_users | 5 | | Aria_pagecache_blocks_not_flushed | 0 | | Aria_pagecache_blocks_unused | 15706 | | Aria_pagecache_blocks_used | 2 | | Aria_pagecache_read_requests | 12 | | Aria_pagecache_reads | 2 | | Aria_pagecache_write_requests | 4 | | Aria_pagecache_writes | 0 | | Aria_transaction_log_syncs | 0 | | Binlog_commits | 0 | | Binlog_group_commits | 0 | | Binlog_group_commit_trigger_count | 0 | | Binlog_group_commit_trigger_lock_wait | 0 | | Binlog_group_commit_trigger_timeout | 0 | | Binlog_snapshot_file | | | Binlog_snapshot_position | 0 | | Binlog_bytes_written | 0 | | Binlog_cache_disk_use | 0 | | Binlog_cache_use | 0 | | Binlog_stmt_cache_disk_use | 0 | | Binlog_stmt_cache_use | 0 | | Busy_time | 0.000000 | | Bytes_received | 2965 | | Bytes_sent | 388511 | | Com_admin_commands | 0 | | Com_alter_db | 0 | | Com_alter_db_upgrade | 0 | | Com_alter_event | 0 | | Com_alter_function | 0 | | Com_alter_procedure | 0 | | Com_alter_server | 0 | | Com_alter_table | 0 | | Com_alter_tablespace | 0 | | Com_alter_user | 0 | | Com_analyze | 0 | | Com_assign_to_keycache | 0 | | Com_begin | 0 | | Com_binlog | 0 | | Com_call_procedure | 0 | | Com_change_db | 2 | | Com_change_master | 0 | | Com_check | 0 | | Com_checksum | 0 | | Com_commit | 0 | | Com_compound_sql | 0 | | Com_create_db | 0 | | Com_create_event | 0 | | Com_create_function | 0 | | Com_create_index | 0 | | Com_create_procedure | 0 | | Com_create_role | 0 | | Com_create_server | 0 | | Com_create_table | 0 | | Com_create_temporary_table | 0 | | Com_create_trigger | 0 | | Com_create_udf | 0 | | Com_create_user | 0 | | Com_create_view | 0 | | Com_dealloc_sql | 0 | | Com_delete | 0 | | Com_delete_multi | 0 | | Com_do | 0 | | Com_drop_db | 0 | | Com_drop_event | 0 | | Com_drop_function | 0 | | Com_drop_index | 0 | | Com_drop_procedure | 0 | | Com_drop_role | 0 | | Com_drop_server | 0 | | Com_drop_table | 0 | | Com_drop_temporary_table | 0 | | Com_drop_trigger | 0 | | Com_drop_user | 0 | | Com_drop_view | 0 | | Com_empty_query | 0 | | Com_execute_immediate | 0 | | Com_execute_sql | 0 | | Com_flush | 1 | | Com_get_diagnostics | 0 | | Com_grant | 0 | | Com_grant_role | 0 | | Com_ha_close | 0 | | Com_ha_open | 0 | | Com_ha_read | 0 | | Com_help | 2 | | Com_insert | 0 | | Com_insert_select | 0 | | Com_install_plugin | 0 | | Com_kill | 0 | | Com_load | 0 | | Com_lock_tables | 0 | | Com_multi | 0 | | Com_optimize | 0 | | Com_preload_keys | 0 | | Com_prepare_sql | 0 | | Com_purge | 0 | | Com_purge_before_date | 0 | | Com_release_savepoint | 0 | | Com_rename_table | 0 | | Com_rename_user | 0 | | Com_repair | 0 | | Com_replace | 0 | | Com_replace_select | 0 | | Com_reset | 0 | | Com_resignal | 0 | | Com_revoke | 0 | | Com_revoke_all | 0 | | Com_revoke_role | 0 | | Com_rollback | 0 | | Com_rollback_to_savepoint | 0 | | Com_savepoint | 0 | | Com_select | 19 | | Com_set_option | 11 | | Com_show_authors | 0 | | Com_show_binlog_events | 0 | | Com_show_binlogs | 0 | | Com_show_charsets | 0 | | Com_show_collations | 0 | | Com_show_contributors | 0 | | Com_show_create_db | 0 | | Com_show_create_event | 0 | | Com_show_create_func | 0 | | Com_show_create_proc | 0 | | Com_show_create_table | 4 | | Com_show_create_trigger | 0 | | Com_show_create_user | 0 | | Com_show_databases | 0 | | Com_show_engine_logs | 0 | | Com_show_engine_mutex | 0 | | Com_show_engine_status | 0 | | Com_show_errors | 0 | | Com_show_events | 0 | | Com_show_explain | 0 | | Com_show_fields | 0 | | Com_show_function_status | 0 | | Com_show_generic | 0 | | Com_show_grants | 0 | | Com_show_keys | 0 | | Com_show_master_status | 0 | | Com_show_open_tables | 0 | | Com_show_plugins | 0 | | Com_show_privileges | 0 | | Com_show_procedure_status | 0 | | Com_show_processlist | 0 | | Com_show_profile | 0 | | Com_show_profiles | 0 | | Com_show_relaylog_events | 0 | | Com_show_slave_hosts | 0 | | Com_show_slave_status | 0 | | Com_show_status | 3 | | Com_show_storage_engines | 0 | | Com_show_table_status | 9 | | Com_show_tables | 2 | | Com_show_triggers | 0 | | Com_show_variables | 27 | | Com_show_warnings | 0 | | Com_shutdown | 0 | | Com_signal | 0 | | Com_start_all_slaves | 0 | | Com_start_slave | 0 | | Com_stmt_close | 0 | | Com_stmt_execute | 0 | | Com_stmt_fetch | 0 | | Com_stmt_prepare | 0 | | Com_stmt_reprepare | 0 | | Com_stmt_reset | 0 | | Com_stmt_send_long_data | 0 | | Com_stop_all_slaves | 0 | | Com_stop_slave | 0 | | Com_truncate | 0 | | Com_uninstall_plugin | 0 | | Com_unlock_tables | 0 | | Com_update | 0 | | Com_update_multi | 0 | | Com_xa_commit | 0 | | Com_xa_end | 0 | | Com_xa_prepare | 0 | | Com_xa_recover | 0 | | Com_xa_rollback | 0 | | Com_xa_start | 0 | | Compression | OFF | | Connection_errors_accept | 0 | | Connection_errors_internal | 0 | | Connection_errors_max_connections | 0 | | Connection_errors_peer_address | 0 | | Connection_errors_select | 0 | | Connection_errors_tcpwrap | 0 | | Connections | 17 | | Cpu_time | 0.000000 | | Created_tmp_disk_tables | 0 | | Created_tmp_files | 5 | | Created_tmp_tables | 38 | | Delayed_errors | 0 | | Delayed_insert_threads | 0 | | Delayed_writes | 0 | | Delete_scan | 0 | | Empty_queries | 1 | | Executed_events | 0 | | Executed_triggers | 0 | | Feature_check_constraint | 0 | | Feature_delay_key_write | 0 | | Feature_dynamic_columns | 0 | | Feature_fulltext | 0 | | Feature_gis | 0 | | Feature_locale | 0 | | Feature_subquery | 0 | | Feature_timezone | 0 | | Feature_trigger | 0 | | Feature_window_functions | 0 | | Feature_xml | 0 | | Flush_commands | 1 | | Handler_commit | 0 | | Handler_delete | 0 | | Handler_discover | 0 | | Handler_external_lock | 0 | | Handler_icp_attempts | 0 | | Handler_icp_match | 0 | | Handler_mrr_init | 0 | | Handler_mrr_key_refills | 0 | | Handler_mrr_rowid_refills | 0 | | Handler_prepare | 0 | | Handler_read_first | 2 | | Handler_read_key | 3 | | Handler_read_last | 0 | | Handler_read_next | 3 | | Handler_read_prev | 0 | | Handler_read_retry | 0 | | Handler_read_rnd | 0 | | Handler_read_rnd_deleted | 1 | | Handler_read_rnd_next | 10213 | | Handler_rollback | 0 | | Handler_savepoint | 0 | | Handler_savepoint_rollback | 0 | | Handler_tmp_update | 0 | | Handler_tmp_write | 10164 | | Handler_update | 0 | | Handler_write | 0 | | Innodb_buffer_pool_dump_status | | | Innodb_buffer_pool_load_status | Buffer pool(s) load completed at 191029 7:20:21 | | Innodb_buffer_pool_resize_status | | | Innodb_buffer_pool_pages_data | 499 | | Innodb_buffer_pool_bytes_data | 8175616 | | Innodb_buffer_pool_pages_dirty | 0 | | Innodb_buffer_pool_bytes_dirty | 0 | | Innodb_buffer_pool_pages_flushed | 152 | | Innodb_buffer_pool_pages_free | 7692 | | Innodb_buffer_pool_pages_misc | 0 | | Innodb_buffer_pool_pages_total | 8191 | | Innodb_buffer_pool_read_ahead_rnd | 0 | | Innodb_buffer_pool_read_ahead | 0 | | Innodb_buffer_pool_read_ahead_evicted | 0 | | Innodb_buffer_pool_read_requests | 2674 | | Innodb_buffer_pool_reads | 369 | | Innodb_buffer_pool_wait_free | 0 | | Innodb_buffer_pool_write_requests | 1168 | | Innodb_data_fsyncs | 27 | | Innodb_data_pending_fsyncs | 0 | | Innodb_data_pending_reads | 0 | | Innodb_data_pending_writes | 0 | | Innodb_data_read | 6113792 | | Innodb_data_reads | 390 | | Innodb_data_writes | 173 | | Innodb_data_written | 2846208 | | Innodb_dblwr_pages_written | 21 | | Innodb_dblwr_writes | 3 | | Innodb_log_waits | 0 | | Innodb_log_write_requests | 5 | | Innodb_log_writes | 12 | | Innodb_os_log_fsyncs | 18 | | Innodb_os_log_pending_fsyncs | 0 | | Innodb_os_log_pending_writes | 0 | | Innodb_os_log_written | 8704 | | Innodb_page_size | 16384 | | Innodb_pages_created | 131 | | Innodb_pages_read | 368 | | Innodb_pages0_read | 11 | | Innodb_pages_written | 152 | | Innodb_row_lock_current_waits | 0 | | Innodb_row_lock_time | 0 | | Innodb_row_lock_time_avg | 0 | | Innodb_row_lock_time_max | 0 | | Innodb_row_lock_waits | 0 | | Innodb_rows_deleted | 0 | | Innodb_rows_inserted | 0 | | Innodb_rows_read | 125 | | Innodb_rows_updated | 1 | | Innodb_system_rows_deleted | 0 | | Innodb_system_rows_inserted | 0 | | Innodb_system_rows_read | 0 | | Innodb_system_rows_updated | 0 | | Innodb_num_open_files | 13 | | Innodb_truncated_status_writes | 0 | | Innodb_available_undo_logs | 128 | | Innodb_undo_truncations | 0 | | Innodb_page_compression_saved | 0 | | Innodb_num_index_pages_written | 0 | | Innodb_num_non_index_pages_written | 0 | | Innodb_num_pages_page_compressed | 0 | | Innodb_num_page_compressed_trim_op | 0 | | Innodb_num_pages_page_decompressed | 0 | | Innodb_num_pages_page_compression_error | 0 | | Innodb_num_pages_encrypted | 0 | | Innodb_num_pages_decrypted | 0 | | Innodb_have_lz4 | OFF | | Innodb_have_lzo | OFF | | Innodb_have_lzma | OFF | | Innodb_have_bzip2 | OFF | | Innodb_have_snappy | OFF | | Innodb_have_punch_hole | OFF | | Innodb_defragment_compression_failures | 0 | | Innodb_defragment_failures | 0 | | Innodb_defragment_count | 0 | | Innodb_onlineddl_rowlog_rows | 0 | | Innodb_onlineddl_rowlog_pct_used | 0 | | Innodb_onlineddl_pct_progress | 0 | | Innodb_secondary_index_triggered_cluster_reads | 0 | | Innodb_secondary_index_triggered_cluster_reads_avoided | 0 | | Innodb_encryption_rotation_pages_read_from_cache | 0 | | Innodb_encryption_rotation_pages_read_from_disk | 0 | | Innodb_encryption_rotation_pages_modified | 0 | | Innodb_encryption_rotation_pages_flushed | 0 | | Innodb_encryption_rotation_estimated_iops | 0 | | Innodb_encryption_key_rotation_list_length | 0 | | Innodb_encryption_n_merge_blocks_encrypted | 0 | | Innodb_encryption_n_merge_blocks_decrypted | 0 | | Innodb_encryption_n_rowlog_blocks_encrypted | 0 | | Innodb_encryption_n_rowlog_blocks_decrypted | 0 | | Innodb_scrub_background_page_reorganizations | 0 | | Innodb_scrub_background_page_splits | 0 | | Innodb_scrub_background_page_split_failures_underflow | 0 | | Innodb_scrub_background_page_split_failures_out_of_filespace | 0 | | Innodb_scrub_background_page_split_failures_missing_index | 0 | | Innodb_scrub_background_page_split_failures_unknown | 0 | | Innodb_scrub_log | 0 | | Innodb_encryption_num_key_requests | 0 | | Key_blocks_not_flushed | 0 | | Key_blocks_unused | 107138 | | Key_blocks_used | 25 | | Key_blocks_warm | 0 | | Key_read_requests | 61 | | Key_reads | 12 | | Key_write_requests | 21 | | Key_writes | 17 | | Last_query_cost | 10.499000 | | Master_gtid_wait_count | 0 | | Master_gtid_wait_time | 0 | | Master_gtid_wait_timeouts | 0 | | Max_statement_time_exceeded | 0 | | Max_used_connections | 3 | | Memory_used | 68136 | | Not_flushed_delayed_rows | 0 | | Open_files | 39 | | Open_streams | 0 | | Open_table_definitions | 31 | | Open_tables | 24 | | Opened_files | 111 | | Opened_plugin_libraries | 0 | | Opened_table_definitions | 0 | | Opened_tables | 0 | | Opened_views | 0 | | Performance_schema_accounts_lost | 0 | | Performance_schema_cond_classes_lost | 0 | | Performance_schema_cond_instances_lost | 0 | | Performance_schema_digest_lost | 0 | | Performance_schema_file_classes_lost | 0 | | Performance_schema_file_handles_lost | 0 | | Performance_schema_file_instances_lost | 0 | | Performance_schema_hosts_lost | 0 | | Performance_schema_locker_lost | 0 | | Performance_schema_mutex_classes_lost | 0 | | Performance_schema_mutex_instances_lost | 0 | | Performance_schema_rwlock_classes_lost | 0 | | Performance_schema_rwlock_instances_lost | 0 | | Performance_schema_session_connect_attrs_lost | 0 | | Performance_schema_socket_classes_lost | 0 | | Performance_schema_socket_instances_lost | 0 | | Performance_schema_stage_classes_lost | 0 | | Performance_schema_statement_classes_lost | 0 | | Performance_schema_table_handles_lost | 0 | | Performance_schema_table_instances_lost | 0 | | Performance_schema_thread_classes_lost | 0 | | Performance_schema_thread_instances_lost | 0 | | Performance_schema_users_lost | 0 | | Prepared_stmt_count | 0 | | Qcache_free_blocks | 1 | | Qcache_free_memory | 1031336 | | Qcache_hits | 0 | | Qcache_inserts | 0 | | Qcache_lowmem_prunes | 0 | | Qcache_not_cached | 0 | | Qcache_queries_in_cache | 0 | | Qcache_total_blocks | 1 | | Queries | 184 | | Questions | 86 | | Rows_read | 13 | | Rows_sent | 10182 | | Rows_tmp_read | 11132 | | Rpl_status | AUTH_MASTER | | Select_full_join | 0 | | Select_full_range_join | 0 | | Select_range | 0 | | Select_range_check | 0 | | Select_scan | 38 | | Slave_connections | 0 | | Slave_heartbeat_period | 0.000 | | Slave_open_temp_tables | 0 | | Slave_received_heartbeats | 0 | | Slave_retried_transactions | 0 | | Slave_running | OFF | | Slave_skipped_errors | 0 | | Slaves_connected | 0 | | Slaves_running | 0 | | Slow_launch_threads | 0 | | Slow_queries | 0 | | Sort_merge_passes | 0 | | Sort_priority_queue_sorts | 0 | | Sort_range | 0 | | Sort_rows | 0 | | Sort_scan | 0 | | Ssl_accept_renegotiates | 0 | | Ssl_accepts | 0 | | Ssl_callback_cache_hits | 0 | | Ssl_cipher | | | Ssl_cipher_list | | | Ssl_client_connects | 0 | | Ssl_connect_renegotiates | 0 | | Ssl_ctx_verify_depth | 0 | | Ssl_ctx_verify_mode | 0 | | Ssl_default_timeout | 0 | | Ssl_finished_accepts | 0 | | Ssl_finished_connects | 0 | | Ssl_server_not_after | | | Ssl_server_not_before | | | Ssl_session_cache_hits | 0 | | Ssl_session_cache_misses | 0 | | Ssl_session_cache_mode | NONE | | Ssl_session_cache_overflows | 0 | | Ssl_session_cache_size | 0 | | Ssl_session_cache_timeouts | 0 | | Ssl_sessions_reused | 0 | | Ssl_used_session_cache_entries | 0 | | Ssl_verify_depth | 0 | | Ssl_verify_mode | 0 | | Ssl_version | | | Subquery_cache_hit | 0 | | Subquery_cache_miss | 0 | | Syncs | 2 | | Table_locks_immediate | 80 | | Table_locks_waited | 0 | | Tc_log_max_pages_used | 0 | | Tc_log_page_size | 4096 | | Tc_log_page_waits | 0 | | Threadpool_idle_threads | 0 | | Threadpool_threads | 0 | | Threads_cached | 0 | | Threads_connected | 3 | | Threads_created | 4 | | Threads_running | 1 | | Update_scan | 0 | | Uptime | 29215 | | Uptime_since_flush_status | 29215 | | wsrep_cluster_conf_id | 18446744073709551615 | | wsrep_cluster_size | 0 | | wsrep_cluster_state_uuid | | | wsrep_cluster_status | Disconnected | | wsrep_connected | OFF | | wsrep_local_bf_aborts | 0 | | wsrep_local_index | 18446744073709551615 | | wsrep_provider_name | | | wsrep_provider_vendor | | | wsrep_provider_version | | | wsrep_ready | OFF | | wsrep_thread_count | 0 | +--------------------------------------------------------------+--------------------------------------------------+ 484 rows in set (0.00 sec) MariaDB [yinzhengjie]>
MariaDB [yinzhengjie]> SHOW STATUS; #查看会话状态变量 +--------------------------------------------------------------+--------------------------------------------------+ | Variable_name | Value | +--------------------------------------------------------------+--------------------------------------------------+ | Aborted_clients | 0 | | Aborted_connects | 4 | | Access_denied_errors | 0 | | Acl_column_grants | 2 | | Acl_database_grants | 1 | | Acl_function_grants | 0 | | Acl_procedure_grants | 0 | | Acl_proxy_users | 2 | | Acl_role_grants | 0 | | Acl_roles | 0 | | Acl_table_grants | 1 | | Acl_users | 5 | | Aria_pagecache_blocks_not_flushed | 0 | | Aria_pagecache_blocks_unused | 15706 | | Aria_pagecache_blocks_used | 2 | | Aria_pagecache_read_requests | 12 | | Aria_pagecache_reads | 2 | | Aria_pagecache_write_requests | 4 | | Aria_pagecache_writes | 0 | | Aria_transaction_log_syncs | 0 | | Binlog_commits | 0 | | Binlog_group_commits | 0 | | Binlog_group_commit_trigger_count | 0 | | Binlog_group_commit_trigger_lock_wait | 0 | | Binlog_group_commit_trigger_timeout | 0 | | Binlog_snapshot_file | | | Binlog_snapshot_position | 0 | | Binlog_bytes_written | 0 | | Binlog_cache_disk_use | 0 | | Binlog_cache_use | 0 | | Binlog_stmt_cache_disk_use | 0 | | Binlog_stmt_cache_use | 0 | | Busy_time | 0.000000 | | Bytes_received | 2981 | | Bytes_sent | 402286 | | Com_admin_commands | 0 | | Com_alter_db | 0 | | Com_alter_db_upgrade | 0 | | Com_alter_event | 0 | | Com_alter_function | 0 | | Com_alter_procedure | 0 | | Com_alter_server | 0 | | Com_alter_table | 0 | | Com_alter_tablespace | 0 | | Com_alter_user | 0 | | Com_analyze | 0 | | Com_assign_to_keycache | 0 | | Com_begin | 0 | | Com_binlog | 0 | | Com_call_procedure | 0 | | Com_change_db | 2 | | Com_change_master | 0 | | Com_check | 0 | | Com_checksum | 0 | | Com_commit | 0 | | Com_compound_sql | 0 | | Com_create_db | 0 | | Com_create_event | 0 | | Com_create_function | 0 | | Com_create_index | 0 | | Com_create_procedure | 0 | | Com_create_role | 0 | | Com_create_server | 0 | | Com_create_table | 0 | | Com_create_temporary_table | 0 | | Com_create_trigger | 0 | | Com_create_udf | 0 | | Com_create_user | 0 | | Com_create_view | 0 | | Com_dealloc_sql | 0 | | Com_delete | 0 | | Com_delete_multi | 0 | | Com_do | 0 | | Com_drop_db | 0 | | Com_drop_event | 0 | | Com_drop_function | 0 | | Com_drop_index | 0 | | Com_drop_procedure | 0 | | Com_drop_role | 0 | | Com_drop_server | 0 | | Com_drop_table | 0 | | Com_drop_temporary_table | 0 | | Com_drop_trigger | 0 | | Com_drop_user | 0 | | Com_drop_view | 0 | | Com_empty_query | 0 | | Com_execute_immediate | 0 | | Com_execute_sql | 0 | | Com_flush | 1 | | Com_get_diagnostics | 0 | | Com_grant | 0 | | Com_grant_role | 0 | | Com_ha_close | 0 | | Com_ha_open | 0 | | Com_ha_read | 0 | | Com_help | 2 | | Com_insert | 0 | | Com_insert_select | 0 | | Com_install_plugin | 0 | | Com_kill | 0 | | Com_load | 0 | | Com_lock_tables | 0 | | Com_multi | 0 | | Com_optimize | 0 | | Com_preload_keys | 0 | | Com_prepare_sql | 0 | | Com_purge | 0 | | Com_purge_before_date | 0 | | Com_release_savepoint | 0 | | Com_rename_table | 0 | | Com_rename_user | 0 | | Com_repair | 0 | | Com_replace | 0 | | Com_replace_select | 0 | | Com_reset | 0 | | Com_resignal | 0 | | Com_revoke | 0 | | Com_revoke_all | 0 | | Com_revoke_role | 0 | | Com_rollback | 0 | | Com_rollback_to_savepoint | 0 | | Com_savepoint | 0 | | Com_select | 19 | | Com_set_option | 11 | | Com_show_authors | 0 | | Com_show_binlog_events | 0 | | Com_show_binlogs | 0 | | Com_show_charsets | 0 | | Com_show_collations | 0 | | Com_show_contributors | 0 | | Com_show_create_db | 0 | | Com_show_create_event | 0 | | Com_show_create_func | 0 | | Com_show_create_proc | 0 | | Com_show_create_table | 4 | | Com_show_create_trigger | 0 | | Com_show_create_user | 0 | | Com_show_databases | 0 | | Com_show_engine_logs | 0 | | Com_show_engine_mutex | 0 | | Com_show_engine_status | 0 | | Com_show_errors | 0 | | Com_show_events | 0 | | Com_show_explain | 0 | | Com_show_fields | 0 | | Com_show_function_status | 0 | | Com_show_generic | 0 | | Com_show_grants | 0 | | Com_show_keys | 0 | | Com_show_master_status | 0 | | Com_show_open_tables | 0 | | Com_show_plugins | 0 | | Com_show_privileges | 0 | | Com_show_procedure_status | 0 | | Com_show_processlist | 0 | | Com_show_profile | 0 | | Com_show_profiles | 0 | | Com_show_relaylog_events | 0 | | Com_show_slave_hosts | 0 | | Com_show_slave_status | 0 | | Com_show_status | 4 | | Com_show_storage_engines | 0 | | Com_show_table_status | 9 | | Com_show_tables | 2 | | Com_show_triggers | 0 | | Com_show_variables | 27 | | Com_show_warnings | 0 | | Com_shutdown | 0 | | Com_signal | 0 | | Com_start_all_slaves | 0 | | Com_start_slave | 0 | | Com_stmt_close | 0 | | Com_stmt_execute | 0 | | Com_stmt_fetch | 0 | | Com_stmt_prepare | 0 | | Com_stmt_reprepare | 0 | | Com_stmt_reset | 0 | | Com_stmt_send_long_data | 0 | | Com_stop_all_slaves | 0 | | Com_stop_slave | 0 | | Com_truncate | 0 | | Com_uninstall_plugin | 0 | | Com_unlock_tables | 0 | | Com_update | 0 | | Com_update_multi | 0 | | Com_xa_commit | 0 | | Com_xa_end | 0 | | Com_xa_prepare | 0 | | Com_xa_recover | 0 | | Com_xa_rollback | 0 | | Com_xa_start | 0 | | Compression | OFF | | Connection_errors_accept | 0 | | Connection_errors_internal | 0 | | Connection_errors_max_connections | 0 | | Connection_errors_peer_address | 0 | | Connection_errors_select | 0 | | Connection_errors_tcpwrap | 0 | | Connections | 17 | | Cpu_time | 0.000000 | | Created_tmp_disk_tables | 0 | | Created_tmp_files | 5 | | Created_tmp_tables | 38 | | Delayed_errors | 0 | | Delayed_insert_threads | 0 | | Delayed_writes | 0 | | Delete_scan | 0 | | Empty_queries | 1 | | Executed_events | 0 | | Executed_triggers | 0 | | Feature_check_constraint | 0 | | Feature_delay_key_write | 0 | | Feature_dynamic_columns | 0 | | Feature_fulltext | 0 | | Feature_gis | 0 | | Feature_locale | 0 | | Feature_subquery | 0 | | Feature_timezone | 0 | | Feature_trigger | 0 | | Feature_window_functions | 0 | | Feature_xml | 0 | | Flush_commands | 1 | | Handler_commit | 0 | | Handler_delete | 0 | | Handler_discover | 0 | | Handler_external_lock | 0 | | Handler_icp_attempts | 0 | | Handler_icp_match | 0 | | Handler_mrr_init | 0 | | Handler_mrr_key_refills | 0 | | Handler_mrr_rowid_refills | 0 | | Handler_prepare | 0 | | Handler_read_first | 2 | | Handler_read_key | 3 | | Handler_read_last | 0 | | Handler_read_next | 3 | | Handler_read_prev | 0 | | Handler_read_retry | 0 | | Handler_read_rnd | 0 | | Handler_read_rnd_deleted | 1 | | Handler_read_rnd_next | 10213 | | Handler_rollback | 0 | | Handler_savepoint | 0 | | Handler_savepoint_rollback | 0 | | Handler_tmp_update | 0 | | Handler_tmp_write | 10164 | | Handler_update | 0 | | Handler_write | 0 | | Innodb_buffer_pool_dump_status | | | Innodb_buffer_pool_load_status | Buffer pool(s) load completed at 191029 7:20:21 | | Innodb_buffer_pool_resize_status | | | Innodb_buffer_pool_pages_data | 499 | | Innodb_buffer_pool_bytes_data | 8175616 | | Innodb_buffer_pool_pages_dirty | 0 | | Innodb_buffer_pool_bytes_dirty | 0 | | Innodb_buffer_pool_pages_flushed | 152 | | Innodb_buffer_pool_pages_free | 7692 | | Innodb_buffer_pool_pages_misc | 0 | | Innodb_buffer_pool_pages_total | 8191 | | Innodb_buffer_pool_read_ahead_rnd | 0 | | Innodb_buffer_pool_read_ahead | 0 | | Innodb_buffer_pool_read_ahead_evicted | 0 | | Innodb_buffer_pool_read_requests | 2674 | | Innodb_buffer_pool_reads | 369 | | Innodb_buffer_pool_wait_free | 0 | | Innodb_buffer_pool_write_requests | 1168 | | Innodb_data_fsyncs | 27 | | Innodb_data_pending_fsyncs | 0 | | Innodb_data_pending_reads | 0 | | Innodb_data_pending_writes | 0 | | Innodb_data_read | 6113792 | | Innodb_data_reads | 390 | | Innodb_data_writes | 173 | | Innodb_data_written | 2846208 | | Innodb_dblwr_pages_written | 21 | | Innodb_dblwr_writes | 3 | | Innodb_log_waits | 0 | | Innodb_log_write_requests | 5 | | Innodb_log_writes | 12 | | Innodb_os_log_fsyncs | 18 | | Innodb_os_log_pending_fsyncs | 0 | | Innodb_os_log_pending_writes | 0 | | Innodb_os_log_written | 8704 | | Innodb_page_size | 16384 | | Innodb_pages_created | 131 | | Innodb_pages_read | 368 | | Innodb_pages0_read | 11 | | Innodb_pages_written | 152 | | Innodb_row_lock_current_waits | 0 | | Innodb_row_lock_time | 0 | | Innodb_row_lock_time_avg | 0 | | Innodb_row_lock_time_max | 0 | | Innodb_row_lock_waits | 0 | | Innodb_rows_deleted | 0 | | Innodb_rows_inserted | 0 | | Innodb_rows_read | 125 | | Innodb_rows_updated | 1 | | Innodb_system_rows_deleted | 0 | | Innodb_system_rows_inserted | 0 | | Innodb_system_rows_read | 0 | | Innodb_system_rows_updated | 0 | | Innodb_num_open_files | 13 | | Innodb_truncated_status_writes | 0 | | Innodb_available_undo_logs | 128 | | Innodb_undo_truncations | 0 | | Innodb_page_compression_saved | 0 | | Innodb_num_index_pages_written | 0 | | Innodb_num_non_index_pages_written | 0 | | Innodb_num_pages_page_compressed | 0 | | Innodb_num_page_compressed_trim_op | 0 | | Innodb_num_pages_page_decompressed | 0 | | Innodb_num_pages_page_compression_error | 0 | | Innodb_num_pages_encrypted | 0 | | Innodb_num_pages_decrypted | 0 | | Innodb_have_lz4 | OFF | | Innodb_have_lzo | OFF | | Innodb_have_lzma | OFF | | Innodb_have_bzip2 | OFF | | Innodb_have_snappy | OFF | | Innodb_have_punch_hole | OFF | | Innodb_defragment_compression_failures | 0 | | Innodb_defragment_failures | 0 | | Innodb_defragment_count | 0 | | Innodb_onlineddl_rowlog_rows | 0 | | Innodb_onlineddl_rowlog_pct_used | 0 | | Innodb_onlineddl_pct_progress | 0 | | Innodb_secondary_index_triggered_cluster_reads | 0 | | Innodb_secondary_index_triggered_cluster_reads_avoided | 0 | | Innodb_encryption_rotation_pages_read_from_cache | 0 | | Innodb_encryption_rotation_pages_read_from_disk | 0 | | Innodb_encryption_rotation_pages_modified | 0 | | Innodb_encryption_rotation_pages_flushed | 0 | | Innodb_encryption_rotation_estimated_iops | 0 | | Innodb_encryption_key_rotation_list_length | 0 | | Innodb_encryption_n_merge_blocks_encrypted | 0 | | Innodb_encryption_n_merge_blocks_decrypted | 0 | | Innodb_encryption_n_rowlog_blocks_encrypted | 0 | | Innodb_encryption_n_rowlog_blocks_decrypted | 0 | | Innodb_scrub_background_page_reorganizations | 0 | | Innodb_scrub_background_page_splits | 0 | | Innodb_scrub_background_page_split_failures_underflow | 0 | | Innodb_scrub_background_page_split_failures_out_of_filespace | 0 | | Innodb_scrub_background_page_split_failures_missing_index | 0 | | Innodb_scrub_background_page_split_failures_unknown | 0 | | Innodb_scrub_log | 0 | | Innodb_encryption_num_key_requests | 0 | | Key_blocks_not_flushed | 0 | | Key_blocks_unused | 107138 | | Key_blocks_used | 25 | | Key_blocks_warm | 0 | | Key_read_requests | 61 | | Key_reads | 12 | | Key_write_requests | 21 | | Key_writes | 17 | | Last_query_cost | 10.499000 | | Master_gtid_wait_count | 0 | | Master_gtid_wait_time | 0 | | Master_gtid_wait_timeouts | 0 | | Max_statement_time_exceeded | 0 | | Max_used_connections | 3 | | Memory_used | 68136 | | Not_flushed_delayed_rows | 0 | | Open_files | 39 | | Open_streams | 0 | | Open_table_definitions | 31 | | Open_tables | 24 | | Opened_files | 111 | | Opened_plugin_libraries | 0 | | Opened_table_definitions | 0 | | Opened_tables | 0 | | Opened_views | 0 | | Performance_schema_accounts_lost | 0 | | Performance_schema_cond_classes_lost | 0 | | Performance_schema_cond_instances_lost | 0 | | Performance_schema_digest_lost | 0 | | Performance_schema_file_classes_lost | 0 | | Performance_schema_file_handles_lost | 0 | | Performance_schema_file_instances_lost | 0 | | Performance_schema_hosts_lost | 0 | | Performance_schema_locker_lost | 0 | | Performance_schema_mutex_classes_lost | 0 | | Performance_schema_mutex_instances_lost | 0 | | Performance_schema_rwlock_classes_lost | 0 | | Performance_schema_rwlock_instances_lost | 0 | | Performance_schema_session_connect_attrs_lost | 0 | | Performance_schema_socket_classes_lost | 0 | | Performance_schema_socket_instances_lost | 0 | | Performance_schema_stage_classes_lost | 0 | | Performance_schema_statement_classes_lost | 0 | | Performance_schema_table_handles_lost | 0 | | Performance_schema_table_instances_lost | 0 | | Performance_schema_thread_classes_lost | 0 | | Performance_schema_thread_instances_lost | 0 | | Performance_schema_users_lost | 0 | | Prepared_stmt_count | 0 | | Qcache_free_blocks | 1 | | Qcache_free_memory | 1031336 | | Qcache_hits | 0 | | Qcache_inserts | 0 | | Qcache_lowmem_prunes | 0 | | Qcache_not_cached | 0 | | Qcache_queries_in_cache | 0 | | Qcache_total_blocks | 1 | | Queries | 185 | | Questions | 87 | | Rows_read | 13 | | Rows_sent | 10182 | | Rows_tmp_read | 11616 | | Rpl_status | AUTH_MASTER | | Select_full_join | 0 | | Select_full_range_join | 0 | | Select_range | 0 | | Select_range_check | 0 | | Select_scan | 38 | | Slave_connections | 0 | | Slave_heartbeat_period | 0.000 | | Slave_open_temp_tables | 0 | | Slave_received_heartbeats | 0 | | Slave_retried_transactions | 0 | | Slave_running | OFF | | Slave_skipped_errors | 0 | | Slaves_connected | 0 | | Slaves_running | 0 | | Slow_launch_threads | 0 | | Slow_queries | 0 | | Sort_merge_passes | 0 | | Sort_priority_queue_sorts | 0 | | Sort_range | 0 | | Sort_rows | 0 | | Sort_scan | 0 | | Ssl_accept_renegotiates | 0 | | Ssl_accepts | 0 | | Ssl_callback_cache_hits | 0 | | Ssl_cipher | | | Ssl_cipher_list | | | Ssl_client_connects | 0 | | Ssl_connect_renegotiates | 0 | | Ssl_ctx_verify_depth | 0 | | Ssl_ctx_verify_mode | 0 | | Ssl_default_timeout | 0 | | Ssl_finished_accepts | 0 | | Ssl_finished_connects | 0 | | Ssl_server_not_after | | | Ssl_server_not_before | | | Ssl_session_cache_hits | 0 | | Ssl_session_cache_misses | 0 | | Ssl_session_cache_mode | NONE | | Ssl_session_cache_overflows | 0 | | Ssl_session_cache_size | 0 | | Ssl_session_cache_timeouts | 0 | | Ssl_sessions_reused | 0 | | Ssl_used_session_cache_entries | 0 | | Ssl_verify_depth | 0 | | Ssl_verify_mode | 0 | | Ssl_version | | | Subquery_cache_hit | 0 | | Subquery_cache_miss | 0 | | Syncs | 2 | | Table_locks_immediate | 80 | | Table_locks_waited | 0 | | Tc_log_max_pages_used | 0 | | Tc_log_page_size | 4096 | | Tc_log_page_waits | 0 | | Threadpool_idle_threads | 0 | | Threadpool_threads | 0 | | Threads_cached | 0 | | Threads_connected | 3 | | Threads_created | 4 | | Threads_running | 1 | | Update_scan | 0 | | Uptime | 29263 | | Uptime_since_flush_status | 29263 | | wsrep_cluster_conf_id | 18446744073709551615 | | wsrep_cluster_size | 0 | | wsrep_cluster_state_uuid | | | wsrep_cluster_status | Disconnected | | wsrep_connected | OFF | | wsrep_local_bf_aborts | 0 | | wsrep_local_index | 18446744073709551615 | | wsrep_provider_name | | | wsrep_provider_vendor | | | wsrep_provider_version | | | wsrep_ready | OFF | | wsrep_thread_count | 0 | +--------------------------------------------------------------+--------------------------------------------------+ 484 rows in set (0.00 sec) MariaDB [yinzhengjie]> MariaDB [yinzhengjie]>
MariaDB [yinzhengjie]> SHOW STATUS LIKE 'com_select'; #查看当前数据库执行查询的总次数 +---------------+-------+ | Variable_name | Value | +---------------+-------+ | Com_select | 22 | +---------------+-------+ 1 row in set (0.00 sec) MariaDB [yinzhengjie]> MariaDB [yinzhengjie]> SELECT * FROM students_info; #此处我们故意执行一条查询语句 +------+-----------+ | id | name | +------+-----------+ | 1 | 花果山 | | 2 | 孙悟空 | +------+-----------+ 2 rows in set (0.00 sec) MariaDB [yinzhengjie]> MariaDB [yinzhengjie]> INSERT INTO students_info VALUES (3,'孙大圣'),(4,'美猴王'),(5,'孙侯子'); Query OK, 3 rows affected (0.00 sec) Records: 3 Duplicates: 0 Warnings: 0 MariaDB [yinzhengjie]> MariaDB [yinzhengjie]> SHOW STATUS LIKE 'com_select'; #查看当前数据库执行查询的总次数 +---------------+-------+ | Variable_name | Value | +---------------+-------+ | Com_select | 23 | +---------------+-------+ 1 row in set (0.00 sec) MariaDB [yinzhengjie]> MariaDB [yinzhengjie]> UPDATE students_info SET name = 'Sun' WHERE id = 2; Query OK, 1 row affected (0.01 sec) Rows matched: 1 Changed: 1 Warnings: 0 MariaDB [yinzhengjie]> MariaDB [yinzhengjie]> SHOW STATUS LIKE 'com_select'; #查看当前数据库执行查询的总次数 +---------------+-------+ | Variable_name | Value | +---------------+-------+ | Com_select | 23 | +---------------+-------+ 1 row in set (0.00 sec) MariaDB [yinzhengjie]> MariaDB [yinzhengjie]> SELECT * FROM students_info; +------+-----------+ | id | name | +------+-----------+ | 1 | 花果山 | | 2 | Sun | | 3 | 孙大圣 | | 4 | 美猴王 | | 5 | 孙侯子 | +------+-----------+ 5 rows in set (0.00 sec) MariaDB [yinzhengjie]> MariaDB [yinzhengjie]> SELECT * FROM students_info; +------+-----------+ | id | name | +------+-----------+ | 1 | 花果山 | | 2 | Sun | | 3 | 孙大圣 | | 4 | 美猴王 | | 5 | 孙侯子 | +------+-----------+ 5 rows in set (0.00 sec) MariaDB [yinzhengjie]> MariaDB [yinzhengjie]> MariaDB [yinzhengjie]> SHOW STATUS LIKE 'com_select'; +---------------+-------+ | Variable_name | Value | +---------------+-------+ | Com_select | 25 | +---------------+-------+ 1 row in set (0.00 sec) MariaDB [yinzhengjie]> MariaDB [yinzhengjie]> SET com_select = 100; #该语句执行会报错，因为状态变量是只读的，我们无法进行修改操作。 ERROR 1193 (HY000): Unknown system variable 'com_select' MariaDB [yinzhengjie]>
三.服务器变量SQL_MODE
1>.什么是SQL_MODE
对其设置可以完成一些约束检查的工作,可分别进行全局的设置或当前会话的设置。 博主推荐阅读: https://mariadb.com/kb/en/library/sql-mode/
2>.常见SQL_MODE
NO_AUTO_CREATE_USER 禁止GRANT创建密码为空的用户 NO_ZERO_DATE 在严格模式，不允许使用‘0000-00-00’的时间 ONLY_FULL_GROUP_BY 对于GROUP BY聚合操作，如果在SELECT中的列，没有在GROUP BY中出现，那么将认为这个SQL是不合法的 NO_BACKSLASH_ESCAPES 反斜杠“”作为普通字符而非转义字符 PIPES_AS_CONCAT 将"||"视为连接操作符而非“或运算符”
MariaDB [yinzhengjie]> SHOW VARIABLES LIKE 'sql_mode'; +---------------+-------------------------------------------------------------------------------------------+ | Variable_name | Value | +---------------+-------------------------------------------------------------------------------------------+ | sql_mode | STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION | +---------------+-------------------------------------------------------------------------------------------+ 1 row in set (0.00 sec) MariaDB [yinzhengjie]>
3>.SQL_MODE案例
MariaDB [yinzhengjie]> SHOW VARIABLES LIKE 'sql_mode'; #在mariaDB 10.2.x版本默认开启了SQL_MODE。 +---------------+-------------------------------------------------------------------------------------------+ | Variable_name | Value | +---------------+-------------------------------------------------------------------------------------------+ | sql_mode | STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION | +---------------+-------------------------------------------------------------------------------------------+ 1 row in set (0.00 sec) MariaDB [yinzhengjie]> MariaDB [yinzhengjie]> SET SQL_MODE = ''; #此处我们故意清空MaraDB 10.2.x版本默认的SQL_MODE Query OK, 0 rows affected (0.00 sec) MariaDB [yinzhengjie]> MariaDB [yinzhengjie]> SHOW VARIABLES LIKE 'sql_mode'; +---------------+-------+ | Variable_name | Value | +---------------+-------+ | sql_mode | | +---------------+-------+ 1 row in set (0.00 sec) MariaDB [yinzhengjie]>
MariaDB [yinzhengjie]> CREATE TABLE students_info(id INT,name CHAR(3)); #我们让name字段的属性仅能存储3个字符 Query OK, 0 rows affected (0.02 sec) MariaDB [yinzhengjie]> MariaDB [yinzhengjie]> INSERT INTO students_info VALUES (1,'花果山水帘洞齐天大圣孙悟空'); #我们在插入的时候故意超过3个字符,虽然语句执行成功但有报警信息 Query OK, 1 row affected, 1 warning (0.01 sec) MariaDB [yinzhengjie]> MariaDB [yinzhengjie]> SHOW WARNINGS; #上面的输出提示有一条warning信息，我们可以看到警告信息的详细内容，说是name列的字段被截断。 +---------+------+-------------------------------------------+ | Level | Code | Message | +---------+------+-------------------------------------------+ | Warning | 1265 | Data truncated for column 'name' at row 1 | +---------+------+-------------------------------------------+ row in set (0.00 sec) MariaDB [yinzhengjie]> SELECT * FROM students_info; #此时我们查看数据是插入了，但是name列仅仅保存了3个字符，将我们原来插入的字符阶段保存啦！ +------+-----------+ | id | name | +------+-----------+ | 1 | 花果山 | +------+-----------+ row in set (0.00 sec) MariaDB [yinzhengjie]> MariaDB [yinzhengjie]> MariaDB [yinzhengjie]> SET SQL_MODE = 'traditional'; #此时我们故意修改SQL_MODE属性为传统模式 Query OK, 0 rows affected (0.00 sec) MariaDB [yinzhengjie]> MariaDB [yinzhengjie]> SHOW VARIABLES LIKE 'sql_mode'; #发现此时SQL_MODE多出了一堆的属性值。 +---------------+-------------------------------------------------------------------------------------------------------------------------------- ----------------------+| Variable_name | Value |+---------------+-------------------------------------------------------------------------------------------------------------------------------- ----------------------+| sql_mode | STRICT_TRANS_TABLES,STRICT_ALL_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,TRADITIONAL,NO_AUTO_CREATE_USER,N O_ENGINE_SUBSTITUTION |+---------------+-------------------------------------------------------------------------------------------------------------------------------- ----------------------+
1 row in set (0.00 sec) MariaDB [yinzhengjie]> MariaDB [yinzhengjie]> MariaDB [yinzhengjie]> INSERT INTO students_info VALUES (2,'花果山水帘洞齐天大圣孙悟空'); #当我们再次插入数据不会有警告信息而是直接报错啦，说是name这一列太长啦！ ERROR 1406 (22001): Data too long for column 'name' at row 1 MariaDB [yinzhengjie]> MariaDB [yinzhengjie]> INSERT INTO students_info VALUES (2,'孙悟空'); #当我们对name这一列插入的字符串不超过3个字符时是可以正常写入的。 Query OK, 1 row affected (0.01 sec) MariaDB [yinzhengjie]> MariaDB [yinzhengjie]> SELECT * FROM students_info; #很显然，SQL_MODE可以强制检测插入的数据是否符合表中字段定义类型限制 +------+-----------+ | id | name | +------+-----------+ | 1 | 花果山 | | 2 | 孙悟空 | +------+-----------+ rows in set (0.00 sec) MariaDB [yinzhengjie]> MariaDB [yinzhengjie]>