Performance Schema events_waits_summary_by_user_by_event_name Table

The Performance Schema events_waits_summary_by_user_by_event_name table contains wait events summarized by user and event name. It contains the following columns:

Column	Description
`USER`	User. Used together with `EVENT_NAME` for grouping events.
`EVENT_NAME`	Event name. Used together with `USER` 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.

Example

SELECT * FROM events_waits_summary_by_user_by_event_name\G
...
*************************** 916. row ***************************
          USER: NULL
    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
*************************** 917. row ***************************
          USER: NULL
    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
*************************** 918. row ***************************
          USER: NULL
    EVENT_NAME: idle
    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_waits_summary_by_user_by_event_name-table/