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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:

Column	Description
`HOST`	Host. Used together with `EVENT_NAME` for grouping events.
`EVENT_NAME`	Event name. Used together with `HOST` 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_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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https://mariadb.com/kb/en/performance-schema-events_stages_summary_by_host_by_event_name-table/