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UPDATE performance_schema.setup_instruments SET enabled = 'NO', timed = 'YES';
UPDATE performance_schema.setup_instruments SET enabled = 'YES'
WHERE name LIKE 'wait/synch/mutex/%'
OR name LIKE 'wait/synch/rwlock/%';
DROP TABLE IF EXISTS t1;
CREATE TABLE t1 (id INT PRIMARY KEY, b CHAR(100) DEFAULT 'initial value')
ENGINE=MyISAM;
INSERT INTO t1 (id) VALUES (1), (2), (3), (4), (5), (6), (7), (8);
TRUNCATE TABLE performance_schema.events_waits_history_long;
TRUNCATE TABLE performance_schema.events_waits_history;
TRUNCATE TABLE performance_schema.events_waits_current;
SELECT * FROM t1 WHERE id = 1;
id b
1 initial value
SET @before_count = (SELECT SUM(TIMER_WAIT)
FROM performance_schema.events_waits_history_long
WHERE (EVENT_NAME = 'wait/synch/mutex/sql/LOCK_open'));
SELECT * FROM t1;
id b
1 initial value
2 initial value
3 initial value
4 initial value
5 initial value
6 initial value
7 initial value
8 initial value
SET @after_count = (SELECT SUM(TIMER_WAIT)
FROM performance_schema.events_waits_history_long
WHERE (EVENT_NAME = 'wait/synch/mutex/sql/LOCK_open'));
SELECT IF((@after_count - @before_count) > 0, 'Success', 'Failure') test_fm1_timed;
test_fm1_timed
Success
UPDATE performance_schema.setup_instruments SET enabled = 'NO'
WHERE NAME = 'wait/synch/mutex/sql/LOCK_open';
TRUNCATE TABLE performance_schema.events_waits_history_long;
TRUNCATE TABLE performance_schema.events_waits_history;
TRUNCATE TABLE performance_schema.events_waits_current;
SELECT * FROM t1 WHERE id = 1;
id b
1 initial value
SET @before_count = (SELECT SUM(TIMER_WAIT)
FROM performance_schema.events_waits_history_long
WHERE (EVENT_NAME = 'wait/synch/mutex/sql/LOCK_open'));
SELECT * FROM t1;
id b
1 initial value
2 initial value
3 initial value
4 initial value
5 initial value
6 initial value
7 initial value
8 initial value
SET @after_count = (SELECT SUM(TIMER_WAIT)
FROM performance_schema.events_waits_history_long
WHERE (EVENT_NAME = 'wait/synch/mutex/sql/LOCK_open'));
SELECT IF((COALESCE(@after_count, 0) - COALESCE(@before_count, 0)) = 0, 'Success', 'Failure') test_fm2_timed;
test_fm2_timed
Success
TRUNCATE TABLE performance_schema.events_waits_history_long;
TRUNCATE TABLE performance_schema.events_waits_history;
TRUNCATE TABLE performance_schema.events_waits_current;
SELECT * FROM t1 WHERE id = 1;
id b
1 initial value
SET @before_count = (SELECT SUM(TIMER_WAIT)
FROM performance_schema.events_waits_history_long
WHERE (EVENT_NAME = 'wait/synch/rwlock/sql/LOCK_grant'));
SELECT * FROM t1;
id b
1 initial value
2 initial value
3 initial value
4 initial value
5 initial value
6 initial value
7 initial value
8 initial value
SET @after_count = (SELECT SUM(TIMER_WAIT)
FROM performance_schema.events_waits_history_long
WHERE (EVENT_NAME = 'wait/synch/rwlock/sql/LOCK_grant'));
SELECT IF((@after_count - @before_count) > 0, 'Success', 'Failure') test_fm1_rw_timed;
test_fm1_rw_timed
Success
UPDATE performance_schema.setup_instruments SET enabled = 'NO'
WHERE NAME = 'wait/synch/rwlock/sql/LOCK_grant';
TRUNCATE TABLE performance_schema.events_waits_history_long;
TRUNCATE TABLE performance_schema.events_waits_history;
TRUNCATE TABLE performance_schema.events_waits_current;
SELECT * FROM t1 WHERE id = 1;
id b
1 initial value
SET @before_count = (SELECT SUM(TIMER_WAIT)
FROM performance_schema.events_waits_history_long
WHERE (EVENT_NAME = 'wait/synch/rwlock/sql/LOCK_grant'));
SELECT * FROM t1;
id b
1 initial value
2 initial value
3 initial value
4 initial value
5 initial value
6 initial value
7 initial value
8 initial value
SET @after_count = (SELECT SUM(TIMER_WAIT)
FROM performance_schema.events_waits_history_long
WHERE (EVENT_NAME = 'wait/synch/rwlock/sql/LOCK_grant'));
SELECT IF((COALESCE(@after_count, 0) - COALESCE(@before_count, 0)) = 0, 'Success', 'Failure') test_fm2_rw_timed;
test_fm2_rw_timed
Success
DROP TABLE t1;
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