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1f51d6c0f6
- Added missing information about database of corresponding table for various types of commands - Update some typos - Reviewed by: <vicentiu@mariadb.org>
51 lines
3.6 KiB
Text
51 lines
3.6 KiB
Text
select * from performance_schema.events_waits_current
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where event_name like 'Wait/Synch/%' limit 1;
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select * from performance_schema.events_waits_current
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where event_name='FOO';
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insert into performance_schema.events_waits_current
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set thread_id='1', event_id=1,
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event_name='FOO', timer_start=1, timer_end=2, timer_wait=3;
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ERROR 42000: INSERT command denied to user 'root'@'localhost' for table `performance_schema`.`events_waits_current`
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update performance_schema.events_waits_current
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set timer_start=12;
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ERROR 42000: UPDATE command denied to user 'root'@'localhost' for table `performance_schema`.`events_waits_current`
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update performance_schema.events_waits_current
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set timer_start=12 where thread_id=0;
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ERROR 42000: UPDATE command denied to user 'root'@'localhost' for table `performance_schema`.`events_waits_current`
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delete from performance_schema.events_waits_current
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where thread_id=1;
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ERROR 42000: DELETE command denied to user 'root'@'localhost' for table `performance_schema`.`events_waits_current`
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delete from performance_schema.events_waits_current;
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ERROR 42000: DELETE command denied to user 'root'@'localhost' for table `performance_schema`.`events_waits_current`
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LOCK TABLES performance_schema.events_waits_current READ;
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ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table `performance_schema`.`events_waits_current`
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UNLOCK TABLES;
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LOCK TABLES performance_schema.events_waits_current WRITE;
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ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table `performance_schema`.`events_waits_current`
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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_current';
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column_name column_comment
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THREAD_ID Thread associated with the event. Together with EVENT_ID uniquely identifies the row.
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EVENT_ID Thread's current event number at the start of the event. Together with THREAD_ID uniquely identifies the row.
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END_EVENT_ID NULL when the event starts, set to the thread's current event number at the end of the event.
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EVENT_NAME Event instrument name and a NAME from the setup_instruments table
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SOURCE Name and line number of the source file containing the instrumented code that produced the event.
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TIMER_START Value in picoseconds when the event timing started or NULL if timing is not collected.
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TIMER_END Value in picoseconds when the event timing ended, or NULL if the event has not ended or timing is not collected.
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TIMER_WAIT Value in picoseconds of the event's duration or NULL if the event has not ended or timing is not collected.
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SPINS Number of spin rounds for a mutex, or NULL if spin rounds are not used, or spinning is not instrumented.
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OBJECT_SCHEMA Name of the schema that contains the table for table I/O objects, otherwise NULL for file I/O and synchronization objects.
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OBJECT_NAME File name for file I/O objects, table name for table I/O objects, the socket's IP:PORT value for a socket object or NULL for a synchronization object.
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INDEX_NAME Name of the index, PRIMARY for the primary key, or NULL for no index used.
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OBJECT_TYPE FILE for a file object, TABLE or TEMPORARY TABLE for a table object, or NULL for a synchronization object.
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OBJECT_INSTANCE_BEGIN Address in memory of the object.
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NESTING_EVENT_ID EVENT_ID of event within which this event nests.
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NESTING_EVENT_TYPE Nesting event type. Either statement, stage or wait.
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OPERATION Operation type, for example read, write or lock
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NUMBER_OF_BYTES Number of bytes that the operation read or wrote, or NULL for table I/O waits.
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FLAGS Reserved for use in the future.
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