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
Comments
Comments loading...
Content reproduced on this site is the property of its respective owners,
and this content is not reviewed in advance by MariaDB. The views, information and opinions
expressed by this content do not necessarily represent those of MariaDB or any other party.