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528abc749e
Improve documentation of performance_schema tables by appending COLUMN comments to tables. Additionally improve test coverage and update corresponding tests.
49 lines
2.9 KiB
Plaintext
49 lines
2.9 KiB
Plaintext
select * from performance_schema.events_waits_summary_by_instance
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where event_name like 'Wait/Synch/%' limit 1;
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select * from performance_schema.events_waits_summary_by_instance
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where event_name='FOO';
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select * from performance_schema.events_waits_summary_by_instance
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order by count_star limit 1;
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select * from performance_schema.events_waits_summary_by_instance
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order by count_star desc limit 1;
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select * from performance_schema.events_waits_summary_by_instance
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where min_timer_wait > 0 order by count_star limit 1;
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select * from performance_schema.events_waits_summary_by_instance
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where min_timer_wait > 0 order by count_star desc limit 1;
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insert into performance_schema.events_waits_summary_by_instance
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set event_name='FOO', object_instance_begin=0,
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count_star=1, sum_timer_wait=2, min_timer_wait=3,
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avg_timer_wait=4, max_timer_wait=5;
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ERROR 42000: INSERT command denied to user 'root'@'localhost' for table 'events_waits_summary_by_instance'
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update performance_schema.events_waits_summary_by_instance
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set count_star=12;
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ERROR 42000: UPDATE command denied to user 'root'@'localhost' for table 'events_waits_summary_by_instance'
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update performance_schema.events_waits_summary_by_instance
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set count_star=12 where event_name like "FOO";
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ERROR 42000: UPDATE command denied to user 'root'@'localhost' for table 'events_waits_summary_by_instance'
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delete from performance_schema.events_waits_summary_by_instance
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where count_star=1;
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ERROR 42000: DELETE command denied to user 'root'@'localhost' for table 'events_waits_summary_by_instance'
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delete from performance_schema.events_waits_summary_by_instance;
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ERROR 42000: DELETE command denied to user 'root'@'localhost' for table 'events_waits_summary_by_instance'
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LOCK TABLES performance_schema.events_waits_summary_by_instance READ;
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ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'events_waits_summary_by_instance'
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UNLOCK TABLES;
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LOCK TABLES performance_schema.events_waits_summary_by_instance WRITE;
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ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'events_waits_summary_by_instance'
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UNLOCK TABLES;
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#
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# MDEV-25325 column_comment for performance_schema tables
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#
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select column_name, column_comment
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from information_schema.columns
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where table_schema='performance_schema' and table_name='events_waits_summary_by_instance';
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column_name column_comment
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EVENT_NAME Event name. Used together with OBJECT_INSTANCE_BEGIN for grouping events.
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OBJECT_INSTANCE_BEGIN If an instrument creates multiple instances, each instance has a unique OBJECT_INSTANCE_BEGIN value to allow for grouping by instance.
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COUNT_STAR Number of summarized events
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SUM_TIMER_WAIT Total wait time of the summarized events that are timed.
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MIN_TIMER_WAIT Minimum wait time of the summarized events that are timed.
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AVG_TIMER_WAIT Average wait time of the summarized events that are timed.
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MAX_TIMER_WAIT Maximum wait time of the summarized events that are timed.
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