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select * from performance_schema.events_statements_history
where event_name like 'statement/%' limit 1;
select * from performance_schema.events_statements_history
where event_name='FOO';
select * from performance_schema.events_statements_history
where event_name like 'statement/%' order by timer_wait limit 1;
select * from performance_schema.events_statements_history
where event_name like 'statement/%' order by timer_wait desc limit 1;
insert into performance_schema.events_statements_history
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_statements_history'
update performance_schema.events_statements_history
set timer_start=12;
ERROR 42000: UPDATE command denied to user 'root'@'localhost' for table 'events_statements_history'
update performance_schema.events_statements_history
set timer_start=12 where thread_id=0;
ERROR 42000: UPDATE command denied to user 'root'@'localhost' for table 'events_statements_history'
delete from performance_schema.events_statements_history
where thread_id=1;
ERROR 42000: DELETE command denied to user 'root'@'localhost' for table 'events_statements_history'
delete from performance_schema.events_statements_history;
ERROR 42000: DELETE command denied to user 'root'@'localhost' for table 'events_statements_history'
LOCK TABLES performance_schema.events_statements_history READ;
ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'events_statements_history'
UNLOCK TABLES;
LOCK TABLES performance_schema.events_statements_history WRITE;
ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'events_statements_history'
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_statements_history';
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.
LOCK_TIME Time in picoseconds spent waiting for locks. The time is calculated in microseconds but stored in picoseconds for compatibility with other timings.
SQL_TEXT The SQL statement, or NULL if the command is not associated with an SQL statement.
DIGEST Statement digest.
DIGEST_TEXT Statement digest text.
CURRENT_SCHEMA Statement's default database for the statement, or NULL if there was none.
OBJECT_TYPE Reserved, currently NULL
OBJECT_SCHEMA Reserved, currently NULL
OBJECT_NAME Reserved, currently NULL
OBJECT_INSTANCE_BEGIN Address in memory of the statement object.
MYSQL_ERRNO Error code. See MariaDB Error Codes for a full list.
RETURNED_SQLSTATE The SQLSTATE value.
MESSAGE_TEXT Statement error message. See MariaDB Error Codes.
ERRORS 0 if SQLSTATE signifies completion (starting with 00) or warning (01), otherwise 1.
WARNINGS Number of warnings from the diagnostics area.
ROWS_AFFECTED Number of rows affected the statement affected.
ROWS_SENT Number of rows returned.
ROWS_EXAMINED Number of rows read during the statement's execution.
CREATED_TMP_DISK_TABLES Number of on-disk temp tables created by the statement.
CREATED_TMP_TABLES Number of temp tables created by the statement.
SELECT_FULL_JOIN Number of joins performed by the statement which did not use an index.
SELECT_FULL_RANGE_JOIN Number of joins performed by the statement which used a range search of the first table.
SELECT_RANGE Number of joins performed by the statement which used a range of the first table.
SELECT_RANGE_CHECK Number of joins without keys performed by the statement that check for key usage after each row.
SELECT_SCAN Number of joins performed by the statement which used a full scan of the first table.
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.
SORT_RANGE Number of sorts performed by the statement which used a range.
SORT_ROWS Number of rows sorted by the statement.
SORT_SCAN Number of sorts performed by the statement which used a full table scan.
NO_INDEX_USED 0 if the statement performed a table scan with an index, 1 if without an index.
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.
NESTING_EVENT_ID Reserved, currently NULL.
NESTING_EVENT_TYPE Reserved, currently NULL.
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