mysqld Ver 5.6.2-m5 for Linux on i686 (MySQL Community Server (GPL))
Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Starts the MySQL database server.
Usage: mysqld [OPTIONS]
Default options are read from the following files in the given order:
/etc/my.cnf /etc/mysql/my.cnf /usr/etc/my.cnf ~/.my.cnf
The following groups are read: mysqld server mysqld-5.6
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.
--defaults-file=# Only read default options from the given file #.
--defaults-extra-file=# Read this file after the global files are read.
--abort-slave-event-count=#
Option used by mysql-test for debugging and testing of
replication.
--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'.
--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 MySQL can
have. This comes into play when the main MySQL thread
gets very many connection requests in a very short time
-b, --basedir=name Path to installation directory. All paths are usually
resolved relative to this
--big-tables Allow big result sets by saving all temporary sets on
file (Solves most 'table full' errors)
--bind-address=name IP address to bind to.
--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. Possible values are NONE and
CRC32; default is NONE.
--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. If NDBCLUSTER is enabled and
binlog-format is MIXED, the format switches to row-based
and back implicitly per each query accessing an
NDBCLUSTER table
--binlog-ignore-db=name
Tells the master that updates to the given database
should not be logged to the binary log.
--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-rows-query-log-events
Allow writing of Rows_query_log events into binary log.
--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. Possible values are
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)
--default-storage-engine=name
The default storage engine for new tables
--default-time-zone=name
Set the default time zone.
--default-week-format=#
The default week format used by WEEK() functions
--delay-key-write[=name]
Type of DELAY_KEY_WRITE
--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.
--disconnect-slave-event-count=#
Option used by mysql-test for debugging and testing of
replication.
--div-precision-increment=#
Precision of the result of '/' operator will be increased
on that value
--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)
-T, --exit-info[=#] Used for debugging. Use at your own risk.
--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
--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.
--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.
--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
--group-concat-max-len=#
The maximum length of the result of function
GROUP_CONCAT()
-?, --help Display this help and exit.
--ignore-builtin-innodb
Disable initialization of builtin InnoDB plugin
--init-connect=name Command(s) that are executed for each new connection
--init-file=name Read SQL commands from this file at startup
--init-slave=name Command(s) that are executed by a slave server each time
the SQL thread starts
--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 full joins
--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
-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.
--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-bin[=name] Log update queries in binary format. Optional (but
strongly recommended to avoid replication problems if
server's hostname changes) argument should be the chosen
location for the binary log files.
--log-bin-index=name
File that holds the names for 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] Error log file
--log-isam[=name] Log all MyISAM changes to file.
--log-output=name Syntax: log-output=value[,value...], where "value" could
be TABLE, FILE or NONE
--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.
--log-slow-slave-statements
Log slow statements executed by slave thread to the slow
log if it is open.
--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 log file
--long-query-time=# Log all queries that have taken more than long_query_time
seconds to execute to 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.
--master-info-repository=name
Defines the type of the repository for the master
information.
--master-retry-count=#
The number of tries the slave will make to connect to the
master before giving up. Deprecated option, use 'CHANGE
MASTER TO master_retry_count = <num>' instead.
--master-verify-checksum
Force checksum verification of logged events in binary
log before sending them to slaves or printing them in
output of SHOW BINLOG EVENTS. Disabled by default.
--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-dump-events=#
Option used by mysql-test for debugging and testing of
replication.
--max-binlog-size=# Binary log will be rotated automatically when the size
exceeds this value. Will also apply to relay logs if
max_relay_log_size is 0
--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-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-prepared-stmt-count=#
Maximum number of prepared statements in the server
--max-relay-log-size=#
If non-zero: relay log will be rotated automatically when
the size exceeds this value; if zero: when the size
exceeds max_binlog_size
--max-seeks-for-key=#
Limit assumed max number of seeks when looking up rows
based on a key
--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-tmp-tables=# Maximum number of temporary tables a client can keep open
at a time
--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.
--min-examined-row-limit=#
Don't write queries to slow log that examine fewer rows
than that
--multi-range-count=#
Number of key ranges to request at once
--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
-n, --new Use very new possible "unsafe" functions
--old Use compatible behavior
--old-alter-table Use old, non-optimized alter table
--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 then mysqld will reserve max_connections*5 or
max_connections + table_cache*2 (whichever is larger)
number of file descriptors
--optimizer-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
--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-switch=name
optimizer_switch=option=val[,option=val...], where option
is one of {index_merge, index_merge_union,
index_merge_sort_union, index_merge_intersection,
engine_condition_pushdown, index_condition_pushdown, mrr,
mrr_cost_based} and val is one of {on, off, default}
--performance-schema
Enable the performance schema.
--performance-schema-events-waits-history-long-size=#
Number of rows in EVENTS_WAITS_HISTORY_LONG.
--performance-schema-events-waits-history-size=#
Number of rows per thread in EVENTS_WAITS_HISTORY.
--performance-schema-max-cond-classes=#
Maximum number of condition instruments.
--performance-schema-max-cond-instances=#
Maximum number of instrumented condition objects.
--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.
--performance-schema-max-mutex-classes=#
Maximum number of mutex instruments.
--performance-schema-max-mutex-instances=#
Maximum number of instrumented MUTEX objects.
--performance-schema-max-rwlock-classes=#
Maximum number of rwlock instruments.
--performance-schema-max-rwlock-instances=#
Maximum number of instrumented RWLOCK objects.
--performance-schema-max-table-handles=#
Maximum number of opened instrumented tables.
--performance-schema-max-table-instances=#
Maximum number of instrumented tables.
--performance-schema-max-thread-classes=#
Maximum number of thread instruments.
--performance-schema-max-thread-instances=#
Maximum number of instrumented threads.
--performance-schema-setup-actors-size=#
Maximum number of rows in SETUP_ACTORS.
--performance-schema-setup-objects-size=#
Maximum number of rows in SETUP_OBJECTS.
--pid-file=name Pid file used by safe_mysqld
--plugin-dir=name Directory for plugins
--plugin-load=name Optional semicolon-separated list of plugins to load,
where each plugin is identified as name=library, where
name is the plugin name and library is the plugin library
in plugin_dir.
-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=#
Limit of query profiling memory
--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-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-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
File that holds the names for relay log files.
--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-info-repository=name
Defines the type of the repository for the relay log
information.
--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-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-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
--safe-mode Skip some optimize stages (for testing).
--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
--secure-file-priv=name
Limit LOAD DATA, SELECT ... OUTFILE, and LOAD_FILE() to
files within specified directory
--server-id=# Uniquely identifies the server instance in the community
of replication partners
--show-slave-auth-info
Show user and password in SHOW SLAVE HOSTS on this
master.
--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-new Don't use new, possibly wrong routines.
--skip-show-database
Don't allow 'SHOW DATABASE' commands
--skip-slave-start If set, slave is not autostarted.
--skip-stack-trace Don't print a stack trace on failure.
--slave-compressed-protocol
Use compression on master/slave protocol
--slave-exec-mode=name
Modes for 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. 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-net-timeout=#
Number of seconds to wait for more data from a
master/slave connection before aborting the read
--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. Enabled by
default.
(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. Legal
values are: ALL_LOSSY to enable lossy conversions and
ALL_NON_LOSSY to enable non-lossy conversions. If the
variable is assigned the empty set, no conversions are
allowed and it is expected that the types match exactly.
--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
--sporadic-binlog-dump-fail
Option used by mysql-test for debugging and testing of
replication.
--sql-mode=name Syntax: sql-mode=mode[,mode[,mode...]]. See the manual
for the complete list of valid sql modes
--ssl Enable SSL for connection (automatically enabled with
other flags).
--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-key=name X509 key in PEM format (implies --ssl)
--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 (default) to disable synchronous flushing
--sync-relay-log=# Synchronously flush relay log to disk after every #th
event. Use 0 (default) to disable synchronous flushing
--sync-relay-log-info=#
Synchronously flush relay log info to disk after every
#th transaction. Use 0 (default) 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
--tc-heuristic-recover=name
Decision to use in heuristic recover process. Possible
values are COMMIT or 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
--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, loaded-dynamically
--thread-stack=# The stack size for each thread
--time-format=name The TIME format (ignored)
--timed-mutexes Specify whether to time mutexes (only InnoDB mutexes are
currently supported)
--tmp-table-size=# If an internal in-memory temporary table exceeds this
size, MySQL will automatically convert it to an on-disk
MyISAM 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.
--transaction-prealloc-size=#
Persistent buffer for transactions to be stored in binary
log
--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)
-u, --user=name Run mysqld daemon as user.
-v, --verbose Used with --help option for detailed help.
-V, --version Output version information and exit.
--wait-timeout=# The number of seconds the server waits for activity on a
connection before closing it
Variables (--variable-name=value)
and boolean options {FALSE|TRUE} Value (after reading options)
------------------------------------------------- ------------------------
abort-slave-event-count 0
allow-suspicious-udfs FALSE
auto-increment-increment 1
auto-increment-offset 1
autocommit TRUE
automatic-sp-privileges TRUE
back-log 50
basedir /usr/
big-tables FALSE
bind-address (No default value)
binlog-cache-size 32768
binlog-checksum NONE
binlog-direct-non-transactional-updates FALSE
binlog-format STATEMENT
binlog-row-event-max-size 1024
binlog-row-image FULL
binlog-rows-query-log-events FALSE
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/share/mysql/charsets/
chroot (No default value)
collation-server latin1_swedish_ci
completion-type NO_CHAIN
concurrent-insert AUTO
connect-timeout 10
console FALSE
datadir (No default value)
date-format %Y-%m-%d
datetime-format %Y-%m-%d %H:%i:%s
default-storage-engine InnoDB
default-time-zone (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)
disconnect-slave-event-count 0
div-precision-increment 4
event-scheduler OFF
expire-logs-days 0
external-locking 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 /var/lib/mysql/localhost.log
group-concat-max-len 1024
help TRUE
ignore-builtin-innodb FALSE
init-connect
init-file (No default value)
init-slave
interactive-timeout 28800
join-buffer-size 131072
keep-files-on-create FALSE
key-buffer-size 8388608
key-cache-age-threshold 300
key-cache-block-size 1024
key-cache-division-limit 100
language /usr/share/mysql/
large-pages FALSE
lc-messages en_US
lc-messages-dir /usr/share/mysql/
lc-time-names en_US
local-infile TRUE
lock-wait-timeout 31536000
log-bin (No default value)
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 FALSE
log-slow-slave-statements FALSE
log-tc tc.log
log-tc-size 24576
log-warnings 1
long-query-time 10
low-priority-updates FALSE
lower-case-table-names 0
master-info-file master.info
master-info-repository FILE
master-retry-count 86400
master-verify-checksum FALSE
max-allowed-packet 1048576
max-binlog-cache-size 18446744073709547520
max-binlog-dump-events 0
max-binlog-size 1073741824
max-binlog-stmt-cache-size 18446744073709547520
max-connect-errors 10
max-connections 151
max-delayed-threads 20
max-error-count 64
max-heap-table-size 16777216
max-join-size 18446744073709551615
max-length-for-sort-data 1024
max-prepared-stmt-count 16382
max-relay-log-size 0
max-seeks-for-key 4294967295
max-sort-length 1024
max-sp-recursion-depth 0
max-tmp-tables 32
max-user-connections 0
max-write-lock-count 4294967295
memlock FALSE
min-examined-row-limit 0
multi-range-count 256
net-buffer-length 16384
net-read-timeout 30
net-retry-count 10
net-write-timeout 60
new FALSE
old FALSE
old-alter-table FALSE
old-passwords FALSE
old-style-user-limits FALSE
open-files-limit 1024
optimizer-join-cache-level 4
optimizer-prune-level 1
optimizer-search-depth 62
optimizer-switch index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersec
tion=on,engine_condition_pushdown=on,index_condition_pushdown=on,mrr=on,mrr_cost_based=on
performance-schema FALSE
performance-schema-events-waits-history-long-size 10000
performance-schema-events-waits-history-size 10
performance-schema-max-cond-classes 80
performance-schema-max-cond-instances 1000
performance-schema-max-file-classes 50
performance-schema-max-file-handles 32768
performance-schema-max-file-instances 10000
performance-schema-max-mutex-classes 200
performance-schema-max-mutex-instances 1000000
performance-schema-max-rwlock-classes 30
performance-schema-max-rwlock-instances 1000000
performance-schema-max-table-handles 10000
performance-schema-max-table-instances 1000
performance-schema-max-thread-classes 50
performance-schema-max-thread-instances 1000
performance-schema-setup-actors-size 100
performance-schema-setup-objects-size 100
pid-file /var/lib/mysql/localhost.pid
plugin-dir /usr/lib/mysql/plugin
plugin-load (No default value)
port 3306
port-open-timeout 0
preload-buffer-size 32768
profiling-history-size 15
query-alloc-block-size 8192
query-cache-limit 1048576
query-cache-min-res-unit 4096
query-cache-size 0
query-cache-type ON
query-cache-wlock-invalidate FALSE
query-prealloc-size 8192
range-alloc-block-size 4096
read-buffer-size 131072
read-only FALSE
read-rnd-buffer-size 262144
relay-log (No default value)
relay-log-index (No default value)
relay-log-info-file relay-log.info
relay-log-info-repository FILE
relay-log-purge TRUE
relay-log-recovery FALSE
relay-log-space-limit 0
replicate-same-server-id FALSE
report-host (No default value)
report-password (No default value)
report-port 3306
report-user (No default value)
safe-user-create FALSE
secure-auth FALSE
secure-file-priv (No default value)
server-id 0
show-slave-auth-info 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-exec-mode STRICT
slave-load-tmpdir /tmp
slave-net-timeout 3600
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 /var/lib/mysql/localhost-slow.log
socket /var/lib/mysql/mysql.sock
sort-buffer-size 2097152
sporadic-binlog-dump-fail FALSE
sql-mode
ssl FALSE
ssl-ca (No default value)
ssl-capath (No default value)
ssl-cert (No default value)
ssl-cipher (No default value)
ssl-key (No default value)
super-large-pages FALSE
symbolic-links TRUE
sync-binlog 0
sync-frm TRUE
sync-master-info 0
sync-relay-log 0
sync-relay-log-info 0
sysdate-is-now FALSE
table-cache 400
table-definition-cache 400
table-open-cache 400
tc-heuristic-recover COMMIT
temp-pool TRUE
thread-cache-size 0
thread-concurrency 10
thread-handling one-thread-per-connection
thread-stack 196608
time-format %H:%i:%s
timed-mutexes FALSE
tmp-table-size 16777216
tmpdir /tmp
transaction-alloc-block-size 8192
transaction-isolation REPEATABLE-READ
transaction-prealloc-size 4096
updatable-views-with-limit YES
verbose TRUE
wait-timeout 28800
Plugins have parameters that are not reflected in this list
because execution stopped before plugins were initialized.
To see what values a running MySQL server is using, type
'mysqladmin variables' instead of 'mysqld --verbose --help'.