Performance Schema events_waits_summary_by_instance Table
The Performance Schema events_waits_summary_by_instance table contains wait events summarized by instance. It contains the following columns:
| Column | Description |
|---|---|
EVENT_NAME | Event name. Used together with OBJECT_INSTANCE_BEGIN for grouping events. |
OBJECT_INSTANCE_BEGIN | If an instrument creates multiple instances, each instance has a unique OBJECT_INSTANCE_BEGIN value to allow for grouping by instance. |
COUNT_STAR | Number of summarized events |
SUM_TIMER_WAIT | Total wait time of the summarized events that are timed. |
MIN_TIMER_WAIT | Minimum wait time of the summarized events that are timed. |
AVG_TIMER_WAIT | Average wait time of the summarized events that are timed. |
MAX_TIMER_WAIT | Maximum wait time of the summarized events that are timed. |
The *_TIMER_WAIT columns only calculate results for timed events, as non-timed events have a NULL wait time.
Example
SELECT * FROM events_waits_summary_by_instance\G
...
*************************** 202. row ***************************
EVENT_NAME: wait/io/file/sql/binlog
OBJECT_INSTANCE_BEGIN: 140578961969856
COUNT_STAR: 6
SUM_TIMER_WAIT: 90478331960
MIN_TIMER_WAIT: 263344
AVG_TIMER_WAIT: 15079721848
MAX_TIMER_WAIT: 67760576376
*************************** 203. row ***************************
EVENT_NAME: wait/io/file/sql/dbopt
OBJECT_INSTANCE_BEGIN: 140578961970560
COUNT_STAR: 6
SUM_TIMER_WAIT: 39891428472
MIN_TIMER_WAIT: 387168
AVG_TIMER_WAIT: 6648571412
MAX_TIMER_WAIT: 24503293304
*************************** 204. row ***************************
EVENT_NAME: wait/io/file/sql/dbopt
OBJECT_INSTANCE_BEGIN: 140578961971264
COUNT_STAR: 6
SUM_TIMER_WAIT: 39902495024
MIN_TIMER_WAIT: 177888
AVG_TIMER_WAIT: 6650415692
MAX_TIMER_WAIT: 21026400404
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