系统表介绍
events_statements_summary_by_account_by_event_name 包含所有等待事件按访客与等待事件的汇总
| 列名 | 含义 |
|---|---|
| USER | 用户名 |
| HOST | 客户端IP |
| EVENT_NAME | 事件名 |
| 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 |
| SUM_LOCK_TIME | 总锁等待事件 |
| SUM_ERRORS | 总报错数量 |
| SUM_WARNINGS | 总警告数量 |
| SUM_ROWS_AFFECTED | 总涉及的行数 |
| SUM_ROWS_SENT | 总语句返回行数 |
| SUM_ROWS_EXAMINED | 总在server层检查的行数（不包含在内部存储影响处理的数量） |
| SUM_CREATED_TMP_DISK_TABLES | 总内部创建磁盘临时表的数量 |
| SUM_CREATED_TMP_TABLES | 总内部创建临时表的数量 |
| SUM_SELECT_FULL_JOIN | 总由于没有索引引起全表连接的数量 |
| SUM_SELECT_FULL_RANGE_JOIN | 总在引用表发生大范围扫描的次数 |
| SUM_SELECT_RANGE | 总在初始表使用范围方式获取记录的次数 |
| SUM_SELECT_RANGE_CHECK | 总判断是否要使用范围扫描的次数 |
| SUM_SELECT_SCAN | 总全表扫描次数 |
| SUM_SORT_MERGE_PASSES | 总再排序次数 |
| SUM_SORT_RANGE | 总范围扫描时按顺序读取记录的次数 |
| SUM_SORT_ROWS | 总排序的行数 |
| SUM_SORT_SCAN | 总全表扫描是按顺序读取的次数 |
| SUM_NO_INDEX_USED | 总标识是否使用索引 |
| SUM_NO_GOOD_INDEX_USED | 总标识是否使用好的索引 |
实例
mysql> SELECT *
-> FROM events_statements_summary_by_account_by_event_name
-> WHERE COUNT_STAR > 0
-> order by 1 desc
-> limit 2 \G ;
*************************** 1. row ***************************
USER: root
HOST: localhost
EVENT_NAME: statement/sql/select
COUNT_STAR: 67
SUM_TIMER_WAIT: 74967355000
MIN_TIMER_WAIT: 133612000
AVG_TIMER_WAIT: 1118915000
MAX_TIMER_WAIT: 5646697000
SUM_LOCK_TIME: 10051000000
SUM_ERRORS: 1
SUM_WARNINGS: 0
SUM_ROWS_AFFECTED: 0
SUM_ROWS_SENT: 2956
SUM_ROWS_EXAMINED: 26188
SUM_CREATED_TMP_DISK_TABLES: 0
SUM_CREATED_TMP_TABLES: 1
SUM_SELECT_FULL_JOIN: 0
SUM_SELECT_FULL_RANGE_JOIN: 0
SUM_SELECT_RANGE: 0
SUM_SELECT_RANGE_CHECK: 0
SUM_SELECT_SCAN: 59
SUM_SORT_MERGE_PASSES: 0
SUM_SORT_RANGE: 0
SUM_SORT_ROWS: 52
SUM_SORT_SCAN: 7
SUM_NO_INDEX_USED: 59
SUM_NO_GOOD_INDEX_USED: 0
*************************** 2. row ***************************
USER: root
HOST: localhost
EVENT_NAME: statement/sql/update
COUNT_STAR: 2
SUM_TIMER_WAIT: 2533773000
MIN_TIMER_WAIT: 876794000
AVG_TIMER_WAIT: 1266886000
MAX_TIMER_WAIT: 1656979000
SUM_LOCK_TIME: 677000000
SUM_ERRORS: 0
SUM_WARNINGS: 0
SUM_ROWS_AFFECTED: 1
SUM_ROWS_SENT: 0
SUM_ROWS_EXAMINED: 2044
SUM_CREATED_TMP_DISK_TABLES: 0
SUM_CREATED_TMP_TABLES: 0
SUM_SELECT_FULL_JOIN: 0
SUM_SELECT_FULL_RANGE_JOIN: 0
SUM_SELECT_RANGE: 0
SUM_SELECT_RANGE_CHECK: 0
SUM_SELECT_SCAN: 0
SUM_SORT_MERGE_PASSES: 0
SUM_SORT_RANGE: 0
SUM_SORT_ROWS: 0
SUM_SORT_SCAN: 0
SUM_NO_INDEX_USED: 0
SUM_NO_GOOD_INDEX_USED: 0
2 rows in set (0.01 sec)