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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/io/file/%';
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/io/file/myisam/dfile')
AND (OBJECT_NAME LIKE '%t1.MYD'));
SELECT IF(@before_count > 0, 'Success', 'Failure') has_instrumentation;
has_instrumentation
Success
SELECT * FROM t1 WHERE id < 4;
id b
1 initial value
2 initial value
3 initial value
SET @after_count = (SELECT SUM(TIMER_WAIT)
FROM performance_schema.events_waits_history_long
WHERE (EVENT_NAME = 'wait/io/file/myisam/dfile')
AND (OBJECT_NAME LIKE '%t1.MYD') AND (1 = 1));
SELECT IF((@after_count - @before_count) > 0, 'Success', 'Failure') test_ff1_timed;
test_ff1_timed
Success
UPDATE performance_schema.setup_instruments SET enabled='NO';
SET @before_count = (SELECT SUM(TIMER_WAIT)
FROM performance_schema.events_waits_history_long
WHERE (EVENT_NAME = 'wait/io/file/myisam/dfile')
AND (OBJECT_NAME LIKE '%t1.MYD') AND (2 = 2));
SELECT * FROM t1 WHERE id < 6;
id b
1 initial value
2 initial value
3 initial value
4 initial value
5 initial value
SET @after_count = (SELECT SUM(TIMER_WAIT)
FROM performance_schema.events_waits_history_long
WHERE (EVENT_NAME = 'wait/io/file/myisam/dfile')
AND (OBJECT_NAME LIKE '%t1.MYD') AND (3 = 3));
SELECT IF((COALESCE(@after_count, 0) - COALESCE(@before_count, 0)) = 0, 'Success', 'Failure') test_ff2_timed;
test_ff2_timed
Success
UPDATE performance_schema.setup_instruments SET enabled = 'YES'
WHERE name LIKE 'wait/io/file/%';
UPDATE performance_schema.setup_instruments SET timed = 'NO';
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 > 4;
id b
5 initial value
6 initial value
7 initial value
8 initial value
SELECT * FROM performance_schema.events_waits_history_long
WHERE TIMER_WAIT != NULL
OR TIMER_START != NULL
OR TIMER_END != NULL;
THREAD_ID EVENT_ID EVENT_NAME SOURCE TIMER_START TIMER_END TIMER_WAIT SPINS OBJECT_SCHEMA OBJECT_NAME OBJECT_TYPE OBJECT_INSTANCE_BEGIN NESTING_EVENT_ID OPERATION NUMBER_OF_BYTES FLAGS
SELECT * FROM performance_schema.events_waits_history
WHERE TIMER_WAIT != NULL
OR TIMER_START != NULL
OR TIMER_END != NULL;
THREAD_ID EVENT_ID EVENT_NAME SOURCE TIMER_START TIMER_END TIMER_WAIT SPINS OBJECT_SCHEMA OBJECT_NAME OBJECT_TYPE OBJECT_INSTANCE_BEGIN NESTING_EVENT_ID OPERATION NUMBER_OF_BYTES FLAGS
SELECT * FROM performance_schema.events_waits_current
WHERE TIMER_WAIT != NULL
OR TIMER_START != NULL
OR TIMER_END != NULL;
THREAD_ID EVENT_ID EVENT_NAME SOURCE TIMER_START TIMER_END TIMER_WAIT SPINS OBJECT_SCHEMA OBJECT_NAME OBJECT_TYPE OBJECT_INSTANCE_BEGIN NESTING_EVENT_ID OPERATION NUMBER_OF_BYTES FLAGS
UPDATE performance_schema.setup_instruments SET timed = 'YES';
SELECT * FROM t1 WHERE id < 4;
id b
1 initial value
2 initial value
3 initial value
DROP TABLE t1;
SELECT SUM(COUNT_READ) AS sum_count_read,
SUM(COUNT_WRITE) AS sum_count_write,
SUM(SUM_NUMBER_OF_BYTES_READ) AS sum_num_bytes_read,
SUM(SUM_NUMBER_OF_BYTES_WRITE) AS sum_num_bytes_write
FROM performance_schema.file_summary_by_instance
WHERE FILE_NAME LIKE CONCAT('%', @@tmpdir, '%') ORDER BY NULL;
SELECT EVENT_NAME, COUNT_STAR, AVG_TIMER_WAIT, SUM_TIMER_WAIT
FROM performance_schema.events_waits_summary_global_by_event_name
WHERE COUNT_STAR > 0
ORDER BY SUM_TIMER_WAIT DESC
LIMIT 10;
SELECT h.EVENT_NAME, SUM(h.TIMER_WAIT) TOTAL_WAIT
FROM performance_schema.events_waits_history_long h
INNER JOIN performance_schema.threads p USING (THREAD_ID)
WHERE p.PROCESSLIST_ID = 1
GROUP BY h.EVENT_NAME
HAVING TOTAL_WAIT > 0;
UPDATE performance_schema.setup_instruments SET enabled = 'YES';
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