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96ae37abc5
MONITOR_OVLD_ROW_LOCK_CURRENT_WAIT monitor should has MONITOR_DISPLAY_CURRENT flag set in its definition, as it shows the current state and does not accumulate anything. Reviewed by: Marko Mäkelä
77 lines
2.7 KiB
Plaintext
77 lines
2.7 KiB
Plaintext
# Check if lock_row_lock_current_waits counter in
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# information_schema.innodb_metrics does not become negative after disabling,
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# resetting and enabling.
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--source include/have_innodb.inc
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--source include/have_debug.inc
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--source include/count_sessions.inc
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--connect (prevent_purge,localhost,root,,)
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START TRANSACTION WITH CONSISTENT SNAPSHOT;
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--connection default
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SET GLOBAL innodb_monitor_disable='all';
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SET GLOBAL innodb_monitor_enable='lock_row_lock_current_waits';
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CREATE TABLE `t` (a INT PRIMARY KEY) engine=InnoDB STATS_PERSISTENT=0;
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INSERT INTO t VALUES (5);
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SELECT name, count FROM information_schema.innodb_metrics
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WHERE name ='lock_row_lock_current_waits';
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--connect (con1,localhost,root,,)
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BEGIN;
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SELECT * FROM t FOR UPDATE;
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--connect (con2,localhost,root,,)
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SET DEBUG_SYNC="lock_wait_before_suspend SIGNAL blocked WAIT_FOR cont";
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BEGIN;
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--send SELECT * FROM t FOR UPDATE
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--connection default
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SET DEBUG_SYNC="now WAIT_FOR blocked";
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SELECT name, count FROM information_schema.innodb_metrics
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WHERE name ='lock_row_lock_current_waits';
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SET GLOBAL innodb_monitor_disable='lock_row_lock_current_waits';
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SET GLOBAL innodb_monitor_reset_all='lock_row_lock_current_waits';
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SET GLOBAL innodb_monitor_enable='lock_row_lock_current_waits';
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######################################
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# Equals to zero if the bug is not fixed, as MONITOR_DISPLAY_CURRENT is not
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# set for this counter and its value is reset during previous
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# "SET GLOBAL innodb_monitor_reset_all='lock_row_lock_current_waits'" execution.
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#####
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SELECT name, count FROM information_schema.innodb_metrics
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WHERE name ='lock_row_lock_current_waits';
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SET DEBUG_SYNC="now SIGNAL cont";
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--disconnect con1
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--connection con2
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--reap
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COMMIT;
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--disconnect con2
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--connection default
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SET DEBUG_SYNC="reset";
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######################################
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# Equals to -1 if the bug is not fixed. I.e.
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# innodb_counter_value[MONITOR_OVLD_ROW_LOCK_CURRENT_WAIT].mon_start_value is
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# set to 1 during
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# "set global innodb_monitor_disable='lock_row_lock_current_waits'" execution,
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# and the value is counted as
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# (value = 0) - (mon_value_reset = 0) - (mon_start_value = 1) +
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# (mon_last_value = 0) = -1. See MONITOR_SET_DIFF() macro in
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# srv_mon_process_existing_counter() for details.
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#####
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SELECT name, count FROM information_schema.innodb_metrics
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WHERE name ='lock_row_lock_current_waits';
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DROP TABLE `t`;
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SET GLOBAL innodb_monitor_disable='lock_row_lock_current_waits';
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SET GLOBAL innodb_monitor_reset_all='lock_row_lock_current_waits';
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SET GLOBAL innodb_monitor_enable='lock_row_lock_current_waits';
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--disable_warnings
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SET GLOBAL innodb_monitor_disable=default;
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SET GLOBAL innodb_monitor_reset_all=default;
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SET GLOBAL innodb_monitor_enable=default;
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--enable_warnings
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--disconnect prevent_purge
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--source include/wait_until_count_sessions.inc
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