102 lines
3.7 KiB
Plaintext
102 lines
3.7 KiB
Plaintext
UPDATE performance_schema.setup_instruments SET enabled = 'NO', timed = 'YES';
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UPDATE performance_schema.setup_instruments SET enabled = 'YES'
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WHERE name LIKE 'wait/synch/mutex/%'
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OR name LIKE 'wait/synch/rwlock/%';
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truncate table performance_schema.events_statements_summary_by_digest;
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flush status;
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select NAME from performance_schema.mutex_instances
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where NAME = 'wait/synch/mutex/sql/LOCK_open';
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NAME
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wait/synch/mutex/sql/LOCK_open
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DROP TABLE IF EXISTS t1;
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CREATE TABLE t1 (id INT PRIMARY KEY, b CHAR(100) DEFAULT 'initial value')
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ENGINE=MyISAM;
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INSERT INTO t1 (id) VALUES (1), (2), (3), (4), (5), (6), (7), (8);
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TRUNCATE TABLE performance_schema.events_waits_history_long;
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TRUNCATE TABLE performance_schema.events_waits_history;
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TRUNCATE TABLE performance_schema.events_waits_current;
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SELECT * FROM t1 WHERE id = 1;
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id b
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1 initial value
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SET @before_count = (SELECT SUM(TIMER_WAIT)
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FROM performance_schema.events_waits_history_long
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WHERE (EVENT_NAME = 'wait/synch/mutex/sql/LOCK_table_cache'));
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SELECT * FROM t1;
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id b
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1 initial value
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2 initial value
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3 initial value
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4 initial value
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5 initial value
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6 initial value
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7 initial value
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8 initial value
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SET @after_count = (SELECT SUM(TIMER_WAIT)
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FROM performance_schema.events_waits_history_long
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WHERE (EVENT_NAME = 'wait/synch/mutex/sql/LOCK_table_cache'));
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SELECT IF((@after_count - @before_count) > 0, 'Success', 'Failure') test_fm1_timed;
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test_fm1_timed
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Success
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UPDATE performance_schema.setup_instruments SET enabled = 'NO'
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WHERE NAME = 'wait/synch/mutex/sql/LOCK_table_cache';
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TRUNCATE TABLE performance_schema.events_waits_history_long;
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TRUNCATE TABLE performance_schema.events_waits_history;
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TRUNCATE TABLE performance_schema.events_waits_current;
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SELECT * FROM t1 WHERE id = 1;
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id b
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1 initial value
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SET @before_count = (SELECT SUM(TIMER_WAIT)
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FROM performance_schema.events_waits_history_long
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WHERE (EVENT_NAME = 'wait/synch/mutex/sql/LOCK_table_cache'));
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SELECT * FROM t1;
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id b
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1 initial value
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2 initial value
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3 initial value
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4 initial value
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5 initial value
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6 initial value
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7 initial value
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8 initial value
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SET @after_count = (SELECT SUM(TIMER_WAIT)
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FROM performance_schema.events_waits_history_long
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WHERE (EVENT_NAME = 'wait/synch/mutex/sql/LOCK_table_cache'));
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SELECT IF((COALESCE(@after_count, 0) - COALESCE(@before_count, 0)) = 0, 'Success', 'Failure') test_fm2_timed;
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test_fm2_timed
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Success
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UPDATE performance_schema.setup_instruments SET enabled = 'YES';
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DROP TABLE t1;
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UPDATE performance_schema.setup_instruments SET enabled = 'YES', timed = 'YES';
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show global status like "performance_schema%_lost";
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Variable_name Value
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Performance_schema_accounts_lost 0
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Performance_schema_cond_classes_lost 0
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Performance_schema_cond_instances_lost 0
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Performance_schema_digest_lost 0
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Performance_schema_file_classes_lost 0
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Performance_schema_file_handles_lost 0
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Performance_schema_file_instances_lost 0
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Performance_schema_hosts_lost 0
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Performance_schema_index_stat_lost 0
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Performance_schema_locker_lost 0
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Performance_schema_memory_classes_lost 0
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Performance_schema_metadata_lock_lost 0
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Performance_schema_mutex_classes_lost 0
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Performance_schema_mutex_instances_lost 0
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Performance_schema_nested_statement_lost 0
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Performance_schema_prepared_statements_lost 0
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Performance_schema_program_lost 0
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Performance_schema_rwlock_classes_lost 0
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Performance_schema_rwlock_instances_lost 0
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Performance_schema_session_connect_attrs_lost 0
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Performance_schema_socket_classes_lost 0
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Performance_schema_socket_instances_lost 0
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Performance_schema_stage_classes_lost 0
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Performance_schema_statement_classes_lost 0
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Performance_schema_table_handles_lost 0
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Performance_schema_table_instances_lost 0
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Performance_schema_table_lock_stat_lost 0
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Performance_schema_thread_classes_lost 0
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Performance_schema_thread_instances_lost 0
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Performance_schema_users_lost 0
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