一、背景

由于項目的業務是不斷往前跑的，所以難免數據庫的表的量會越來越龐大，不斷的擠占硬盤空間。即使再大的空間也支撐不起業務的增長，所以定期刪除不必要的數據是很有必要的。在我們項目中由于不清理數據，一個表占的空間竟然達到了4G之多。想想有多可怕...

這里介紹的是用MySQL 建立一個定時器Event，定期清除掉之前的不必要事件。

二、內容

#1、建立存儲過程供事件調用

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、開啟event(要使定時起作用，MySQL的常量GlOBAL event_schduleer 必須為on 或者1)

show variables like 'event_scheduler'

set global event_scheduler='on'

#3、創建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、開啟Event 事件

alter event middle_event on completion preserve enable;

#5、關閉Event 事件

alter event middle_event on completion preserve disable;

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持我們。

本文標題: MySQL數據庫Event定時執行任務詳解

本文地址: http://www.cppcns.com/shujuku/mysql/213275.html

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