CREATE TABLE `t`(`id` INT, PRIMARY KEY(`id`)) ENGINE=InnoDB STATS_PERSISTENT=0;
INSERT INTO t VALUES (1);
SET GLOBAL innodb_monitor_disable="lock_row_lock_time";
SET GLOBAL innodb_monitor_disable="lock_row_lock_time_max";
SET GLOBAL innodb_monitor_reset_all='lock_row_lock_time';
SET GLOBAL innodb_monitor_reset_all='lock_row_lock_time_max';
SET GLOBAL innodb_monitor_enable="lock_row_lock_time";
SET GLOBAL innodb_monitor_enable="lock_row_lock_time_max";
BEGIN;
SELECT * FROM t FOR UPDATE;
id
1
SELECT @innodb_row_lock_time_before := variable_value
FROM information_schema.global_status
WHERE LOWER(variable_name) = 'innodb_row_lock_time';
connect con1,localhost,root,,;
SET innodb_lock_wait_timeout = 1;
SELECT * FROM t FOR UPDATE;
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
disconnect con1;
connection default;
COMMIT;
SELECT variable_value - @innodb_row_lock_time_before > 100
FROM information_schema.global_status
WHERE LOWER(variable_name) = 'innodb_row_lock_time';
variable_value - @innodb_row_lock_time_before > 100
1
SELECT  variable_value > 100
FROM information_schema.global_status
WHERE LOWER(variable_name) = 'innodb_row_lock_time_max';
variable_value > 100
1
SELECT count_reset > 100
FROM INFORMATION_SCHEMA.INNODB_METRICS
WHERE NAME='lock_row_lock_time';
count_reset > 100
1
SELECT count_reset > 100
FROM INFORMATION_SCHEMA.INNODB_METRICS
WHERE NAME='lock_row_lock_time_max';
count_reset > 100
1
DROP TABLE t;
SET GLOBAL innodb_monitor_enable=default;
SET GLOBAL innodb_monitor_disable=default;
SET GLOBAL innodb_monitor_reset_all=default;