系统表介绍
events_waits_summary_by_thread_by_event_name 按事件名称与线程ID进行汇总
| 列名 | 含义 |
|---|---|
| THREAD_ID | 线程编号 |
| EVENT_NAME | 事件名称 |
| COUNT_STAR | 事件汇总数量 |
| SUM_TIMER_WAIT | 事件总等待时间 |
| MIN_TIMER_WAIT | 事件最小等待时间 |
| AVG_TIMER_WAIT | 事件平均等待时间 |
| MAX_TIMER_WAIT | 事件最大等待时间 |
实例
mysql> SELECT *
-> FROM events_waits_summary_by_thread_by_event_name
-> WHERE COUNT_STAR > 0
-> order by 1 desc
-> limit 10 ;
+-----------+---------------------------+------------+------------------+----------------+----------------+------------------+
| THREAD_ID | EVENT_NAME | COUNT_STAR | SUM_TIMER_WAIT | MIN_TIMER_WAIT | AVG_TIMER_WAIT | MAX_TIMER_WAIT |
+-----------+---------------------------+------------+------------------+----------------+----------------+------------------+
| 45 | idle | 66 | 1830650615000000 | 156000000 | 27737130000000 | 1721593155000000 |
| 45 | wait/io/file/sql/io_cache | 20 | 1149850125 | 2440125 | 57492375 | 214969125 |
| 43 | idle | 10 | 3535000000 | 104000000 | 353000000 | 1058000000 |
| 42 | idle | 10 | 3763000000 | 207000000 | 376000000 | 941000000 |
| 41 | wait/io/file/sql/FRM | 275 | 24937532625 | 1281000 | 90681750 | 21677589375 |
| 41 | wait/io/file/archive/data | 1 | 4288875 | 4288875 | 4288875 | 4288875 |
| 41 | idle | 265 | 1834673557000000 | 155000000 | 6923296000000 | 1719031968000000 |
| 41 | wait/io/file/myisam/dfile | 577 | 29086064250 | 1970250 | 50409000 | 11668195500 |
| 41 | wait/io/file/myisam/kfile | 4 | 879372000 | 2177625 | 219843000 | 787072125 |
| 40 | wait/io/file/archive/data | 1 | 23195625 | 23195625 | 23195625 | 23195625 |
+-----------+---------------------------+------------+------------------+----------------+----------------+------------------+
10 rows in set (0.01 sec)