Mysql下自动删除指定时间以前的记录的操作方法

关于Event：mysql5.1版本开始引进event概念。event既“时间触发器”，与triggers的事件触发不同，event类似与linux crontab计划任务，用于时间触发。通过单独或调用存储过程使用，在某一特定的时间点，触发相关的SQL语句或存储过程。

首先删除2天以前记录的SQL语句(webserver_monitormemory为表名，time为时间字段)：

delete From webserver_monitormemory where DATE(time) <= DATE(DATE_SUB(NOW(),INTERVAL 2 day));

DELIMITER //CREATE PROCEDURE autodel()  -> BEGIN  -> delete From webserver_monitormemory where DATE(time) <= DATE(DATE_SUB(NOW(),INTERVAL 2 day));  -> END  -> //DELIMITER ;

CREATE EVENT `event_auto_del_memorydata`  ON SCHEDULE EVERY 1 DAY STARTS '2017-11-20 00:00:00'  ON COMPLETION NOT PRESERVE ENABLE DO CALL autodel();

SET GLOBAL event_scheduler = 1; SET @@global.event_scheduler = 1; SET GLOBAL event_scheduler = ON; SET @@global.event_scheduler = ON;

SHOW VARIABLES LIKE 'event_scheduler';SELECT @@event_scheduler;SHOW PROCESSLIST;

ALTER EVENT event_auto_del_memorydata ON COMPLETION PRESERVE ENABLE; //开启某事件ALTER EVENT event_auto_del_memorydata ON COMPLETION PRESERVE DISABLE; //关闭某事件

ALTER EVENT event_time_clear_data ON COMPLETION PRESERVE ENABLE;

ALTER EVENT event_time_clear_data ON COMPLETION PRESERVE DISABLE;

DROP PROCEDURE pro_clear_data;

DROP EVENT IF EXISTS event_time_clear_data1

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