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73 lines
5.6 KiB
Text
73 lines
5.6 KiB
Text
select * from performance_schema.events_statements_current
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where event_name like 'statement/%' limit 1;
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select * from performance_schema.events_statements_current
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where event_name='FOO';
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insert into performance_schema.events_statements_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_statements_current`
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update performance_schema.events_statements_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_statements_current`
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update performance_schema.events_statements_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_statements_current`
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delete from performance_schema.events_statements_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_statements_current`
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delete from performance_schema.events_statements_current;
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ERROR 42000: DELETE command denied to user 'root'@'localhost' for table `performance_schema`.`events_statements_current`
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LOCK TABLES performance_schema.events_statements_current READ;
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ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table `performance_schema`.`events_statements_current`
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UNLOCK TABLES;
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LOCK TABLES performance_schema.events_statements_current WRITE;
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ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table `performance_schema`.`events_statements_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_statements_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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LOCK_TIME Time in picoseconds spent waiting for locks. The time is calculated in microseconds but stored in picoseconds for compatibility with other timings.
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SQL_TEXT The SQL statement, or NULL if the command is not associated with an SQL statement.
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DIGEST Statement digest.
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DIGEST_TEXT Statement digest text.
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CURRENT_SCHEMA Statement's default database for the statement, or NULL if there was none.
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OBJECT_TYPE NULL for top level statements. The parent statement object type for nested statements (stored programs).
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OBJECT_SCHEMA NULL for top level statements. The parent statement object schema for nested statements (stored programs).
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OBJECT_NAME NULL for top level statements. The parent statement object name for nested statements (stored programs).
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OBJECT_INSTANCE_BEGIN Address in memory of the statement object.
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MYSQL_ERRNO Error code. See MariaDB Error Codes for a full list.
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RETURNED_SQLSTATE The SQLSTATE value.
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MESSAGE_TEXT Statement error message. See MariaDB Error Codes.
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ERRORS 0 if SQLSTATE signifies completion (starting with 00) or warning (01), otherwise 1.
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WARNINGS Number of warnings from the diagnostics area.
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ROWS_AFFECTED Number of rows affected the statement affected.
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ROWS_SENT Number of rows returned.
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ROWS_EXAMINED Number of rows read during the statement's execution.
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CREATED_TMP_DISK_TABLES Number of on-disk temp tables created by the statement.
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CREATED_TMP_TABLES Number of temp tables created by the statement.
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SELECT_FULL_JOIN Number of joins performed by the statement which did not use an index.
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SELECT_FULL_RANGE_JOIN Number of joins performed by the statement which used a range search of the first table.
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SELECT_RANGE Number of joins performed by the statement which used a range of the first table.
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SELECT_RANGE_CHECK Number of joins without keys performed by the statement that check for key usage after each row.
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SELECT_SCAN Number of joins performed by the statement which used a full scan of the first table.
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SORT_MERGE_PASSES Number of merge passes by the sort algorithm performed by the statement. If too high, you may need to increase the sort_buffer_size.
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SORT_RANGE Number of sorts performed by the statement which used a range.
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SORT_ROWS Number of rows sorted by the statement.
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SORT_SCAN Number of sorts performed by the statement which used a full table scan.
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NO_INDEX_USED 0 if the statement performed a table scan with an index, 1 if without an index.
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NO_GOOD_INDEX_USED 0 if a good index was found for the statement, 1 if no good index was found. See the Range checked for each record description in the EXPLAIN article.
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NESTING_EVENT_ID NULL for top level statements. The parent statement event id for nested statements (stored programs).
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NESTING_EVENT_TYPE NULL for top level statements. The parent statement event type for nested statements (stored programs).
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NESTING_EVENT_LEVEL 0 for top level statements. The parent statement level plus 1 for nested statements (stored programs).
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