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select * from performance_schema.events_stages_current
where event_name like 'stage/%' limit 1;
select * from performance_schema.events_stages_current
where event_name='FOO';
insert into performance_schema.events_stages_current
set thread_id='1', event_id=1,
event_name='FOO', timer_start=1, timer_end=2, timer_wait=3;
ERROR 42000: INSERT command denied to user 'root'@'localhost' for table 'events_stages_current'
update performance_schema.events_stages_current
set timer_start=12;
ERROR 42000: UPDATE command denied to user 'root'@'localhost' for table 'events_stages_current'
update performance_schema.events_stages_current
set timer_start=12 where thread_id=0;
ERROR 42000: UPDATE command denied to user 'root'@'localhost' for table 'events_stages_current'
delete from performance_schema.events_stages_current
where thread_id=1;
ERROR 42000: DELETE command denied to user 'root'@'localhost' for table 'events_stages_current'
delete from performance_schema.events_stages_current;
ERROR 42000: DELETE command denied to user 'root'@'localhost' for table 'events_stages_current'
LOCK TABLES performance_schema.events_stages_current READ;
ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'events_stages_current'
UNLOCK TABLES;
LOCK TABLES performance_schema.events_stages_current WRITE;
ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'events_stages_current'
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_stages_current';
column_name column_comment
THREAD_ID Thread associated with the event. Together with EVENT_ID uniquely identifies the row.
EVENT_ID Thread's current event number at the start of the event. Together with THREAD_ID uniquely identifies the row.
END_EVENT_ID NULL when the event starts, set to the thread's current event number at the end of the event.
EVENT_NAME Event instrument name and a NAME from the setup_instruments table
SOURCE Name and line number of the source file containing the instrumented code that produced the event.
TIMER_START Value in picoseconds when the event timing started or NULL if timing is not collected.
TIMER_END Value in picoseconds when the event timing ended, or NULL if the event has not ended or timing is not collected.
TIMER_WAIT Value in picoseconds of the event's duration or NULL if the event has not ended or timing is not collected.
WORK_COMPLETED
WORK_ESTIMATED
NESTING_EVENT_ID EVENT_ID of event within which this event nests.
NESTING_EVENT_TYPE Nesting event type. Either statement, stage or wait.
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