首页 > 数据库 > MySQL

MySQL数据库Event定时执行任务详解

admin MySQL 2022-02-10 00:43:07 MySQL   Event   定时执行"

一、背景

  由于项目的业务是不断往前跑的,所以难免数据库的表的量会越来越庞大,不断的挤占硬盘空间。即使再大的空间也支撑不起业务的增长,所以定期删除不必要的数据是很有必要的。在我们项目中由于不清理数据,一个表占的空间竟然达到了4G之多。想想有多可怕...

  这里介绍的是用MySQL 建立一个定时器Event,定期清除掉之前的不必要事件。

二、内容

#1、建立存储过程供事件调用
delimiter//
drop procedure if exists middle_proce//
create procedure middle_proce()
begin
DELETE FROM jg_bj_comit_log WHERE comit_time < SUBDATE(NOW(),INTERVAL 2 MONTH);
optimize table jg_bj_comit_log;
DELETE FROM jg_bj_order_create WHERE created_on < SUBDATE(NOW(),INTERVAL 3 MONTH);
optimize table jg_bj_order_create;
DELETE FROM jg_bj_order_match WHERE created_on < SUBDATE(NOW(),INTERVAL 3 MONTH);
optimize table jg_bj_order_match;
DELETE FROM jg_bj_order_cancel WHERE created_on < SUBDATE(NOW(),INTERVAL 3 MONTH);
optimize table jg_bj_order_cancel;
DELETE FROM jg_bj_operate_arrive WHERE created_on < SUBDATE(NOW(),INTERVAL 3 MONTH);
optimize table jg_bj_operate_arrive;
DELETE FROM jg_bj_operate_depart WHERE created_on < SUBDATE(NOW(),INTERVAL 3 MONTH);
optimize table jg_bj_operate_depart;
DELETE FROM jg_bj_operate_login WHERE created_on < SUBDATE(NOW(),INTERVAL 3 MONTH);
optimize table jg_bj_operate_login;
DELETE FROM jg_bj_operate_logout WHERE created_on < SUBDATE(NOW(),INTERVAL 3 MONTH);
optimize table jg_bj_operate_logout;
DELETE FROM jg_bj_operate_pay WHERE created_on < SUBDATE(NOW(),INTERVAL 3 MONTH);
optimize table jg_bj_operate_pay;
DELETE FROM jg_bj_position_driver WHERE created_on < SUBDATE(NOW(),INTERVAL 3 MONTH);
optimize table jg_bj_position_driver;
DELETE FROM jg_bj_position_vehicle WHERE created_on < SUBDATE(NOW(),INTERVAL 3 MONTH);
optimize table jg_bj_position_vehicle;
DELETE FROM jg_bj_rated_passenger WHERE created_on < SUBDATE(NOW(),INTERVAL 3 MONTH);
optimize table jg_bj_rated_passenger;
end//
delimiter;

#2、开启event(要使定时起作用,MySQL的常量GlOBAL event_schduleer 必须为on 或者1)
show variables like 'event_scheduler'
set global event_scheduler='on'

#3、创建Evnet事件
drop event if exists middle_event;
create event middle_event
on schedule every 1 DAY STARTS '2017-12-05 00:00:01'
on completion preserve ENABLE
do call middle_proce();

#4、开启Event 事件
alter event middle_event on completion preserve enable;

#5、关闭Event 事件
alter event middle_event on completion preserve disable;

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持潘少俊衡。

版权声明

本文仅代表作者观点,不代表本站立场。
本文系作者授权发表,未经许可,不得转载。
本文地址:/shujuku/MySQL/105564.html

留言与评论(共有 0 条评论)
   
验证码:

潘少俊衡

| 桂ICP备2023010378号-4

Powered By EmpireCMS

爱享小站

中德益农

谷姐神农

环亚肥料

使用手机软件扫描微信二维码

关注我们可获取更多热点资讯

感谢潘少俊衡友情技术支持