• 对正在运行的mysql进行监控


    对正在运行的mysql进行监控,其中一个方式就是查看mysql运行状态。

    (1)QPS(每秒Query量)

    QPS = Questions(or Queries) / seconds

    mysql > show global status like "Question%";

    (2)TPS(每秒事务量)

    TPS = (Com_commit + Com_rollback) / seconds

    mysql > show global status like "Com_commit";

    mysql > show global status like "Com_rollback";

    (3)key Buffer 命中率

    mysql>show global status like "key%";

    key_buffer_read_hits = (1-key_reads / key_read_requests) * 100%

    key_buffer_write_hits = (1-key_writes / key_write_requests) * 100%

    (4)InnoDB Buffer命中率

    mysql> show status like "innodb_buffer_pool_read%";

    innodb_buffer_read_hits = (1 - innodb_buffer_pool_reads / innodb_buffer_pool_read_requests) * 100%

    (5)Query Cache命中率

    mysql> show status like "Qcache%";

    Query_cache_hits = (Qcahce_hits / (Qcache_hits + Qcache_inserts )) * 100%;

    (6)Table Cache状态量

    mysql> show global status like "open%";

    比较 open_tables 与 opend_tables 值

    (7)Thread Cache 命中率

    mysql> show global status like "Thread%";

    mysql> show global status like "Connections";

    Thread_cache_hits = (1 - Threads_created / connections ) * 100%

    (8)锁定状态

    mysql> show global status like "%lock%";

    Table_locks_waited/Table_locks_immediate=0.3% 如果这个比值比较大的话,说明表锁造成的阻塞比较严重

    Innodb_row_lock_waits innodb行锁,太大可能是间隙锁造成的

    (9)复制延时量

    mysql > show slave status

    查看延时时间

    (10) Tmp Table 状况(临时表状况)

    mysql > show status like "Create_tmp%";

    Created_tmp_disk_tables/Created_tmp_tables比值最好不要超过10%,如果Created_tmp_tables值比较大,

    可能是排序句子过多或者是连接句子不够优化

    (11) Binlog Cache 使用状况

    mysql > show status like "Binlog_cache%";

    如果Binlog_cache_disk_use值不为0 ,可能需要调大 binlog_cache_size大小

    (12) Innodb_log_waits 量

    mysql > show status like "innodb_log_waits";

    Innodb_log_waits值不等于0的话,表明 innodb log buffer 因为空间不足而等待

    比如命令:

    >#show global status;

    虽然可以使用:

    >#show global status like %...%;

    来过滤,但是对应长长的list,每一项都代表什么意思,还是有必要弄清楚。

    一,获取mysql用户下的进程总数

      ps -ef | awk '{print $1}' | grep "mysql" | grep -v "grep" | wc-1

      二,主机性能状态

      # uptime

      [root@ ~]# uptime

      13:05:52 up 53 days, 52 min, 1 user, load average: 0.00, 0.00, 0.00

      三,CPU使用率

      # top

      或

      # vmstat

      四,磁盘IO量

      # vmstat 或 # iostat

      五,swap进出量[内存]

      # free

      六,数据库性能状态

      (1)QPS(每秒Query量)

      QPS = Questions(or Queries) / seconds

      mysql > show /*50000 global */ status like 'Question';

      (2)TPS(每秒事务量)

      TPS = (Com_commit + Com_rollback) / seconds

      mysql > show status like 'Com_commit';

      mysql > show status like 'Com_rollback';

      (3)key Buffer 命中率

      key_buffer_read_hits = (1-key_reads / key_read_requests) * 100%

      key_buffer_write_hits = (1-key_writes / key_write_requests) * 100%

      mysql> show status like 'Key%';

      (4)InnoDB Buffer命中率

      innodb_buffer_read_hits = (1 - innodb_buffer_pool_reads / innodb_buffer_pool_read_requests) * 100%

      mysql> show status like 'innodb_buffer_pool_read%';

      (5)Query Cache命中率

      Query_cache_hits = (Qcahce_hits / (Qcache_hits + Qcache_inserts )) * 100%;

      mysql> show status like 'Qcache%';

      (6)Table Cache状态量

      mysql> show status like 'open%';

      (7)Thread Cache 命中率

      Thread_cache_hits = (1 - Threads_created / connections ) * 100%

      mysql> show status like 'Thread%';

      mysql> show status like 'Connections';

      (8)锁定状态

      mysql> show status like '%lock%';

      (9)复制延时量

      mysql > show slave status

      (10) Tmp Table 状况(临时表状况)

      mysql > show status like 'Create_tmp%';

      (11) Binlog Cache 使用状况

      mysql > show status like 'Binlog_cache%';

      (12) Innodb_log_waits 量

      mysql > show status like 'innodb_log_waits';

      开源监控软件

      一,RRDTool

      二,Nagios

      三,MRTG

      四,Cacti

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  • 原文地址:https://www.cnblogs.com/zhengah/p/4623358.html
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