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CREATE TABLE innodb_monitor(a SERIAL) ENGINE=InnoDB;
SHOW VARIABLES LIKE 'innodb_status_output%';
Variable_name Value
innodb_status_output OFF
innodb_status_output_locks OFF
DROP TABLE innodb_monitor;
SHOW VARIABLES LIKE 'innodb_status_output%';
Variable_name Value
innodb_status_output OFF
innodb_status_output_locks OFF
CREATE TABLE innodb_lock_monitor(a SERIAL) ENGINE=InnoDB;
SHOW VARIABLES LIKE 'innodb_status_output%';
Variable_name Value
innodb_status_output OFF
innodb_status_output_locks OFF
DROP TABLE innodb_lock_monitor;
SHOW VARIABLES LIKE 'innodb_status_output%';
Variable_name Value
innodb_status_output OFF
innodb_status_output_locks OFF
CREATE TABLE innodb_tablespace_monitor(a SERIAL) ENGINE=InnoDB;
DROP TABLE innodb_tablespace_monitor;
CREATE TABLE innodb_table_monitor(a SERIAL) ENGINE=InnoDB;
DROP TABLE innodb_table_monitor;
CREATE TABLE t(a SERIAL) ENGINE=InnoDB;
INSERT INTO t VALUES(42);
BEGIN;
SELECT * FROM t FOR UPDATE;
a
42
SET GLOBAL innodb_status_output_locks=ON;
SET GLOBAL innodb_status_output=ON;
SELECT SLEEP(30);
SLEEP(30)
0
COMMIT;
Pattern "INNODB MONITOR OUTPUT" found
BEGIN;
SELECT * FROM t FOR UPDATE;
a
42
SET GLOBAL innodb_status_output_locks=ON;
SELECT SLEEP(30);
SLEEP(30)
0
COMMIT;
Pattern "ready for connections. Version:" found
BEGIN;
SELECT * FROM t FOR UPDATE;
a
42
SET GLOBAL innodb_status_output=ON;
SELECT SLEEP(30);
SLEEP(30)
0
COMMIT;
# restart
Pattern "INNODB MONITOR OUTPUT" found
DROP TABLE t;
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