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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/%'; truncate table performance_schema.events_statements_summary_by_digest; flush status; select NAME from performance_schema.mutex_instances where NAME = 'wait/synch/mutex/sql/LOCK_open'; NAME wait/synch/mutex/sql/LOCK_open select NAME from performance_schema.rwlock_instances where NAME = 'wait/synch/rwlock/sql/LOCK_grant' limit 1; NAME wait/synch/rwlock/sql/LOCK_grant 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_table_cache')); 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_table_cache')); 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_table_cache'; 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_table_cache')); 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_table_cache')); 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 UPDATE performance_schema.setup_instruments SET enabled = 'YES'; DROP TABLE t1; UPDATE performance_schema.setup_instruments SET enabled = 'YES', timed = 'YES'; show global status like "performance_schema%"; Variable_name Value Performance_schema_accounts_lost 0 Performance_schema_cond_classes_lost 0 Performance_schema_cond_instances_lost 0 Performance_schema_digest_lost 0 Performance_schema_file_classes_lost 0 Performance_schema_file_handles_lost 0 Performance_schema_file_instances_lost 0 Performance_schema_hosts_lost 0 Performance_schema_index_stat_lost 0 Performance_schema_locker_lost 0 Performance_schema_memory_classes_lost 0 Performance_schema_metadata_lock_lost 0 Performance_schema_mutex_classes_lost 0 Performance_schema_mutex_instances_lost 0 Performance_schema_nested_statement_lost 0 Performance_schema_prepared_statements_lost 0 Performance_schema_program_lost 0 Performance_schema_rwlock_classes_lost 0 Performance_schema_rwlock_instances_lost 0 Performance_schema_session_connect_attrs_lost 0 Performance_schema_socket_classes_lost 0 Performance_schema_socket_instances_lost 0 Performance_schema_stage_classes_lost 0 Performance_schema_statement_classes_lost 0 Performance_schema_table_handles_lost 0 Performance_schema_table_instances_lost 0 Performance_schema_table_lock_stat_lost 0 Performance_schema_thread_classes_lost 0 Performance_schema_thread_instances_lost 0 Performance_schema_users_lost 0