Performance Schema events_stages_summary_by_host_by_event_name Table

MariaDB starting with 10.0

The events_stages_summary_by_host_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 host and event name.

It contains the following columns:

ColumnDescription
HOSTHost. Used together with EVENT_NAME for grouping events.
EVENT_NAMEEvent name. Used together with HOST for grouping events.
COUNT_STARNumber of summarized events, which includes all timed and untimed events.
SUM_TIMER_WAITTotal wait time of the timed summarized events.
MIN_TIMER_WAITMinimum wait time of the timed summarized events.
AVG_TIMER_WAITAverage wait time of the timed summarized events.
MAX_TIMER_WAITMaximum wait time of the timed summarized events.

Example

SELECT * FROM events_stages_summary_by_host_by_event_name\G
...
*************************** 216. row ***************************
          HOST: NULL
    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
*************************** 217. row ***************************
          HOST: NULL
    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
*************************** 218. row ***************************
          HOST: NULL
    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

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