W3cubDocs

/MariaDB

Performance Schema events_stages_summary_by_thread_by_event_name Table

MariaDB starting with 10.0

The events_stages_summary_by_thread_by_event_name table was added in MariaDB 10.0 (along with many other new Performance Schema tables).

The table lists stage 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, which includes all timed and untimed events.
SUM_TIMER_WAIT Total wait time of the timed summarized events.
MIN_TIMER_WAIT Minimum wait time of the timed summarized events.
AVG_TIMER_WAIT Average wait time of the timed summarized events.
MAX_TIMER_WAIT Maximum wait time of the timed summarized events.

Example

SELECT * FROM events_stages_summary_by_thread_by_event_name\G
...
*************************** 2287. row ***************************
     THREAD_ID: 64
    EVENT_NAME: stage/sql/Waiting for event metadata lock
    COUNT_STAR: 0
SUM_TIMER_WAIT: 0
MIN_TIMER_WAIT: 0
AVG_TIMER_WAIT: 0
MAX_TIMER_WAIT: 0
*************************** 2288. row ***************************
     THREAD_ID: 64
    EVENT_NAME: stage/sql/Waiting for commit lock
    COUNT_STAR: 0
SUM_TIMER_WAIT: 0
MIN_TIMER_WAIT: 0
AVG_TIMER_WAIT: 0
MAX_TIMER_WAIT: 0
*************************** 2289. row ***************************
     THREAD_ID: 64
    EVENT_NAME: stage/aria/Waiting for a resource
    COUNT_STAR: 0
SUM_TIMER_WAIT: 0
MIN_TIMER_WAIT: 0
AVG_TIMER_WAIT: 0
MAX_TIMER_WAIT: 0
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.

© 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_stages_summary_by_thread_by_event_name-table/