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select * from performance_schema.events_waits_summary_by_host_by_event_name
where event_name like 'Wait/Synch/%' limit 1;
HOST EVENT_NAME COUNT_STAR SUM_TIMER_WAIT MIN_TIMER_WAIT AVG_TIMER_WAIT MAX_TIMER_WAIT
# # # # # # #
select * from performance_schema.events_waits_summary_by_host_by_event_name
where event_name='FOO';
HOST EVENT_NAME COUNT_STAR SUM_TIMER_WAIT MIN_TIMER_WAIT AVG_TIMER_WAIT MAX_TIMER_WAIT
insert into performance_schema.events_waits_summary_by_host_by_event_name
set event_name='FOO', thread_id=1,
count_star=1, sum_timer_wait=2, min_timer_wait=3,
avg_timer_wait=4, max_timer_wait=5;
ERROR 42000: INSERT command denied to user 'root'@'localhost' for table `performance_schema`.`events_waits_summary_by_host_by_event_name`
update performance_schema.events_waits_summary_by_host_by_event_name
set count_star=12;
ERROR 42000: UPDATE command denied to user 'root'@'localhost' for table `performance_schema`.`events_waits_summary_by_host_by_event_name`
update performance_schema.events_waits_summary_by_host_by_event_name
set count_star=12 where event_name like "FOO";
ERROR 42000: UPDATE command denied to user 'root'@'localhost' for table `performance_schema`.`events_waits_summary_by_host_by_event_name`
delete from performance_schema.events_waits_summary_by_host_by_event_name
where count_star=1;
ERROR 42000: DELETE command denied to user 'root'@'localhost' for table `performance_schema`.`events_waits_summary_by_host_by_event_name`
delete from performance_schema.events_waits_summary_by_host_by_event_name;
ERROR 42000: DELETE command denied to user 'root'@'localhost' for table `performance_schema`.`events_waits_summary_by_host_by_event_name`
LOCK TABLES performance_schema.events_waits_summary_by_host_by_event_name READ;
ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table `performance_schema`.`events_waits_summary_by_host_by_event_name`
UNLOCK TABLES;
LOCK TABLES performance_schema.events_waits_summary_by_host_by_event_name WRITE;
ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table `performance_schema`.`events_waits_summary_by_host_by_event_name`
UNLOCK TABLES;
#
# MDEV-25325 column_comment for performance_schema tables
#
select column_name, column_comment
from information_schema.columns
where table_schema='performance_schema' and table_name='events_waits_summary_by_host_by_event_name';
column_name column_comment
HOST Host. Used together with EVENT_NAME for grouping events.
EVENT_NAME Event name. Used together with USER and HOST 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.
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