mysql计划任务

mysql的定时计划任务

 

1、查看event是否开启 show variables like '%sche%';

2、将事件计划开启 set global event_scheduler =1;

3、创建事件语法

CREATE EVENT [IF NOT EXISTS] event_name

ON SCHEDULE schedule

[ON COMPLETION [NOT] PRESERVE]

[ENABLE | DISABLE]

[COMMENT 'comment']

DO sql_statement;

 

schedule:

AT TIMESTAMP [+ INTERVAL INTERVAL] | EVERY INTERVAL [STARTS TIMESTAMP] [ENDS TIMESTAMP]

INTERVAL:

quantity {YEAR | QUARTER | MONTH | DAY | HOUR | MINUTE |WEEK | SECOND | YEAR_MONTH | DAY_HOUR | DAY_MINUTE |DAY_SECOND | HOUR_MINUTE | HOUR_SECOND | MINUTE_SECOND}

4、关闭事件任务

alter event e_test

ON COMPLETION PRESERVE DISABLE;

5、开启事件任务

alter event e_test

ON COMPLETION PRESERVE ENABLE;

6、修改事件语法

ALTER EVENT event_name

[ON SCHEDULE schedule]

[RENAME TO new_event_name]

[ON COMPLETION [NOT] PRESERVE]

[COMMENT 'comment']

[ENABLE | DISABLE]

[DO sql_statement]

7、删除事件语法

DROP EVENT [IF EXISTS] event_name

 

例子：  演示每秒插入一条记录到数据表

CREATE EVENT e_test_insert

ON SCHEDULE EVERY 1 SECOND

DO INSERT INTO test.aaa VALUES (CURRENT_TIMESTAMP);

 

 5天后清空test表

CREATE EVENT e_test

ON SCHEDULE AT CURRENT_TIMESTAMP + INTERVAL 5 DAY

DO TRUNCATE TABLE test.aaa;

 

 2007年7月20日12点整清空test表：

CREATE EVENT e_test

ON SCHEDULE AT TIMESTAMP '2007-07-20 12:00:00'

DO TRUNCATE TABLE test.aaa;

 

 每天定时清空test表

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

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

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

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)

CREATE EVENT e_test

ON SCHEDULE EVERY 1 DAY

ON COMPLETION NOT PRESERVE

DO TRUNCATE TABLE test.aaa;

 

临时关闭事件

ALTER EVENT e_test DISABLE;

 

开启事件

ALTER EVENT e_test ENABLE;

 

将每天清空test表改为5天清空一次：

ALTER EVENT e_test

ON SCHEDULE EVERY 5 DAY