MySQL 创建定时任务 详解
2018-03-25 11:20
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自 MySQL5.1.6起,增加了一个非常有特色的功能–事件调度器(Event Scheduler),可以用做定时执行某些特定任务,来取代原先只能由操作系统的计划任务来执行的工作。事件调度器有时也可称为临时触发器(temporal triggers),因为事件调度器是基于特定时间周期触发来执行某些任务,而触发器(Triggers)是基于某个表所产生的事件触发的,区别也就在这里
在使用这个功能之前必须确保 event_scheduler 已开启,可执行 :mysq> SET GLOBAL event_scheduler = 1;# 或mysql> SET GLOBAL event_scheduler = ON;也可以在配置文件中添加设置 : event_scheduler=1也可以直接在启动命令加上 : --event_scheduler=1
查看当前是否已开启事件调度器 :mysql> SHOW VARIABLES LIKE 'event_scheduler';+-----------------+-------+| Variable_name | Value |+-----------------+-------+| event_scheduler | ON |+-----------------+-------+1 row in set (0.01 sec)# 或mysql> SELECT @@event_scheduler;+-------------------+| @@event_scheduler |+-------------------+| ON |+-------------------+1 row in set (0.00 sec)# 或mysql> SHOW PROCESSLIST;+----+-----------------+-----------+------+---------+------+------------------------+------------------+| Id | User | Host | db | Command | Time | State | Info |+----+-----------------+-----------+------+---------+------+------------------------+------------------+| 6 | root | localhost | NULL | Query | 0 | starting | SHOW PROCESSLIST || 7 | event_scheduler | localhost | NULL | Daemon | 81 | Waiting on empty queue | NULL |+----+-----------------+-----------+------+---------+------+------------------------+------------------+2 rows in set (0.00 sec)
创建事件(CREATE EVENT)CREATE EVENT [IFNOT EXISTS] event_name ON SCHEDULE schedule [ON COMPLETION [NOT] PRESERVE] [ENABLE | DISABLE] [COMMENT 'comment'] DO sql_statement;[ON COMPLETION [NOT] PRESERVE] 可以设置这个事件是执行一次还是持久执行,默认为 NOT PRESERVE[ENABLE | DISABLE] 可是设置该事件创建后状态是否开启或关闭,默认为ENABLE[COMMENT 'comment'] 可以给该事件加上注释
# 创建表mysql> USE Test;mysql> CREATE TABLE aaa(timeline TIMESTAMP);
# 每秒插入一条记录到数据表mysql> CREATE EVENT e_test_insert ON SCHEDULE EVERY 1 SECOND -> DO INSERT INTO test.aaa VALUES(CURRENT_TIMESTAMP);mysql> SELECT * FROM aaa;
# 5天后清空 test表mysql> CREATE EVENT e_test -> ON SCHEDULE AT CURRENT_TIMESTAMP + INTERVAL 5 DAY -> DO TRUNCATE TABLE test.aaa;
# 2018年8月8日8点整清空 test表mysql> CREATE EVENT e_test -> ON SCHEDULE AT TIMESTAMP '2018-08-08 8:00:00' -> DO TRUNCATE TABLE test.aaa;
# 每天定时清空 test表mysql> CREATE EVENT e_test -> ON SCHEDULE EVERY 1 DAY -> DO TRUNCATE TABLE test.aaa;
# 5天后开启每天定时清空test表mysql> CREATE EVENT e_test -> ON SCHEDULE EVERY 1 DAY -> STARTS CURRENT_TIMESTAMP + INTERVAL 5 DAY -> DO TRUNCATE TABLE test.aaa;
# 每天定时清空 test表,5天后停止执行mysql> CREATE EVENT e_test -> ON SCHEDULE EVERY 1 DAY -> ENDS CURRENT_TIMESTAMP + INTERVAL 5 DAY -> DO TRUNCATE TABLE test.aaa;
# 5天后开启每天定时清空test表,一个月后停止执行mysql> CREATE EVENT e_test -> ON SCHEDULE EVERY 1 DAY -> STARTS CURRENT_TIMESTAMP + INTERVAL 5 DAY -> ENDS CURRENT_TIMESTAMP + INTERVAL 1 MONTH -> DO TRUNCATE TABLE test.aaa;
# 每天定时清空test表(只执行一次,任务完成后就终止该事件)mysql> CREATE EVENT e_test -> ON SCHEDULE EVERY 1 DAY -> ON COMPLETION NOT PRESERVE -> DO TRUNCA TETABLE test.aaa;
修改事件(ALTER EVENT)ALTER EVENT event_name [ON SCHEDULE schedule] [RENAME TO new_event_name] [ON COMPLETION [NOT] PRESERVE] [COMMENT 'comment'] [ENABLE | DISABLE] [DO sql_statement]
# 临时关闭事件mysql> ALTER EVENT e_test DISABLE;# 开启事件mysql> ALTER EVENT e_test ENABLE;
# 将每天清空test表改为5天清空一次mysql> ALTER EVENT e_test ON SCHEDULE EVERY 5 DAY;注 : 如果将 event 执行 ALTER EVENT event_name DISABLE. 那么当重新启动 mysql服务器后,该 event 将被删除
删除事件(DROP EVENT)DROP EVENT [IF EXISTS] event_name
# 删除创建的 e_test事件mysql> DROP EVENT e_test; # 如果该事件不存在将会产生 ERROR 1513 (HY000): Unknown event 错误,因此最好加上IF EXISTSmysql> DROP EVENT IF EXISTS e_test;
每秒钟调用一次存储过程,用于判断 SLAVE 是否正常运行,如果发现 SLAVE 关闭了,忽略 0 次错误,然后重新启动 SLAVEmysql> DELIMITER // -> CREATE PROCEDURE Slave_Monitor() -> BEGIN -> SELECT VARIABLE_VALUE INTO @SLAVE_STATUS FROM information_schema.GLOBAL_STATUS WHEREVARIABLE_NAME='SLAVE_RUNNING'; -> IF ('ON'!= @SLAVE_STATUS) THEN -> SET GLOBAL SQL_SLAVE_SKIP_COUNTER=0; -> SLAVE START; -> ENDIF; -> END; // -> DELIMITER;
# 由于存储过程中无法调用类似 SHOW SLAVE STATUS 这样的语句,因此无法得到确切的复制错误信息和错误代码,不能进一步的处理 SLAVE 停止的各种情况mysql> CREATE EVENT IF NOT EXISTS Slave_Monitor -> ON SCHEDULE EVERY 5 SECOND -> ON COMPLETION PRESERVE -> DO CALL Slave_Monitor();
在使用这个功能之前必须确保 event_scheduler 已开启,可执行 :mysq> SET GLOBAL event_scheduler = 1;# 或mysql> SET GLOBAL event_scheduler = ON;也可以在配置文件中添加设置 : event_scheduler=1也可以直接在启动命令加上 : --event_scheduler=1
查看当前是否已开启事件调度器 :mysql> SHOW VARIABLES LIKE 'event_scheduler';+-----------------+-------+| Variable_name | Value |+-----------------+-------+| event_scheduler | ON |+-----------------+-------+1 row in set (0.01 sec)# 或mysql> SELECT @@event_scheduler;+-------------------+| @@event_scheduler |+-------------------+| ON |+-------------------+1 row in set (0.00 sec)# 或mysql> SHOW PROCESSLIST;+----+-----------------+-----------+------+---------+------+------------------------+------------------+| Id | User | Host | db | Command | Time | State | Info |+----+-----------------+-----------+------+---------+------+------------------------+------------------+| 6 | root | localhost | NULL | Query | 0 | starting | SHOW PROCESSLIST || 7 | event_scheduler | localhost | NULL | Daemon | 81 | Waiting on empty queue | NULL |+----+-----------------+-----------+------+---------+------+------------------------+------------------+2 rows in set (0.00 sec)
创建事件(CREATE EVENT)CREATE EVENT [IFNOT EXISTS] event_name ON SCHEDULE schedule [ON COMPLETION [NOT] PRESERVE] [ENABLE | DISABLE] [COMMENT 'comment'] DO sql_statement;[ON COMPLETION [NOT] PRESERVE] 可以设置这个事件是执行一次还是持久执行,默认为 NOT PRESERVE[ENABLE | DISABLE] 可是设置该事件创建后状态是否开启或关闭,默认为ENABLE[COMMENT 'comment'] 可以给该事件加上注释
# 创建表mysql> USE Test;mysql> CREATE TABLE aaa(timeline TIMESTAMP);
# 每秒插入一条记录到数据表mysql> CREATE EVENT e_test_insert ON SCHEDULE EVERY 1 SECOND -> DO INSERT INTO test.aaa VALUES(CURRENT_TIMESTAMP);mysql> SELECT * FROM aaa;
# 5天后清空 test表mysql> CREATE EVENT e_test -> ON SCHEDULE AT CURRENT_TIMESTAMP + INTERVAL 5 DAY -> DO TRUNCATE TABLE test.aaa;
# 2018年8月8日8点整清空 test表mysql> CREATE EVENT e_test -> ON SCHEDULE AT TIMESTAMP '2018-08-08 8:00:00' -> DO TRUNCATE TABLE test.aaa;
# 每天定时清空 test表mysql> CREATE EVENT e_test -> ON SCHEDULE EVERY 1 DAY -> DO TRUNCATE TABLE test.aaa;
# 5天后开启每天定时清空test表mysql> CREATE EVENT e_test -> ON SCHEDULE EVERY 1 DAY -> STARTS CURRENT_TIMESTAMP + INTERVAL 5 DAY -> DO TRUNCATE TABLE test.aaa;
# 每天定时清空 test表,5天后停止执行mysql> CREATE EVENT e_test -> ON SCHEDULE EVERY 1 DAY -> ENDS CURRENT_TIMESTAMP + INTERVAL 5 DAY -> DO TRUNCATE TABLE test.aaa;
# 5天后开启每天定时清空test表,一个月后停止执行mysql> CREATE EVENT e_test -> ON SCHEDULE EVERY 1 DAY -> STARTS CURRENT_TIMESTAMP + INTERVAL 5 DAY -> ENDS CURRENT_TIMESTAMP + INTERVAL 1 MONTH -> DO TRUNCATE TABLE test.aaa;
# 每天定时清空test表(只执行一次,任务完成后就终止该事件)mysql> CREATE EVENT e_test -> ON SCHEDULE EVERY 1 DAY -> ON COMPLETION NOT PRESERVE -> DO TRUNCA TETABLE test.aaa;
修改事件(ALTER EVENT)ALTER EVENT event_name [ON SCHEDULE schedule] [RENAME TO new_event_name] [ON COMPLETION [NOT] PRESERVE] [COMMENT 'comment'] [ENABLE | DISABLE] [DO sql_statement]
# 临时关闭事件mysql> ALTER EVENT e_test DISABLE;# 开启事件mysql> ALTER EVENT e_test ENABLE;
# 将每天清空test表改为5天清空一次mysql> ALTER EVENT e_test ON SCHEDULE EVERY 5 DAY;注 : 如果将 event 执行 ALTER EVENT event_name DISABLE. 那么当重新启动 mysql服务器后,该 event 将被删除
删除事件(DROP EVENT)DROP EVENT [IF EXISTS] event_name
# 删除创建的 e_test事件mysql> DROP EVENT e_test; # 如果该事件不存在将会产生 ERROR 1513 (HY000): Unknown event 错误,因此最好加上IF EXISTSmysql> DROP EVENT IF EXISTS e_test;
每秒钟调用一次存储过程,用于判断 SLAVE 是否正常运行,如果发现 SLAVE 关闭了,忽略 0 次错误,然后重新启动 SLAVEmysql> DELIMITER // -> CREATE PROCEDURE Slave_Monitor() -> BEGIN -> SELECT VARIABLE_VALUE INTO @SLAVE_STATUS FROM information_schema.GLOBAL_STATUS WHEREVARIABLE_NAME='SLAVE_RUNNING'; -> IF ('ON'!= @SLAVE_STATUS) THEN -> SET GLOBAL SQL_SLAVE_SKIP_COUNTER=0; -> SLAVE START; -> ENDIF; -> END; // -> DELIMITER;
# 由于存储过程中无法调用类似 SHOW SLAVE STATUS 这样的语句,因此无法得到确切的复制错误信息和错误代码,不能进一步的处理 SLAVE 停止的各种情况mysql> CREATE EVENT IF NOT EXISTS Slave_Monitor -> ON SCHEDULE EVERY 5 SECOND -> ON COMPLETION PRESERVE -> DO CALL Slave_Monitor();
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