The events_waits_summary_by_thread_by_event_name
table, along with many other new Performance Schema tables, was added in MariaDB 10.0.
The Performance Schema events_waits_summary_by_thread_by_event_name
table contains wait events summarized by thread and event name. It contains the following columns:
Column | Description |
---|---|
THREAD_ID |
Thread associated with the event. Together with EVENT_NAME uniquely identifies the row. |
EVENT_NAME |
Event name. Used together with THREAD_ID for grouping events. |
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.
SELECT * FROM events_waits_summary_by_thread_by_event_name\G ... *************************** 6424. row *************************** THREAD_ID: 64 EVENT_NAME: wait/io/socket/sql/server_unix_socket COUNT_STAR: 0 SUM_TIMER_WAIT: 0 MIN_TIMER_WAIT: 0 AVG_TIMER_WAIT: 0 MAX_TIMER_WAIT: 0 *************************** 6425. row *************************** THREAD_ID: 64 EVENT_NAME: wait/io/socket/sql/client_connection COUNT_STAR: 0 SUM_TIMER_WAIT: 0 MIN_TIMER_WAIT: 0 AVG_TIMER_WAIT: 0 MAX_TIMER_WAIT: 0 *************************** 6426. row *************************** THREAD_ID: 64 EVENT_NAME: idle COUNT_STAR: 73 SUM_TIMER_WAIT: 22005252162000000 MIN_TIMER_WAIT: 3000000 AVG_TIMER_WAIT: 301441810000000 MAX_TIMER_WAIT: 4912417573000000
© 2019 MariaDB
Licensed under the Creative Commons Attribution 3.0 Unported License and the GNU Free Documentation License.
https://mariadb.com/kb/en/performance-schema-events_waits_summary_by_thread_by_event_name-table/