MySQL資料庫 Event 定時執行任務

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一、背景

  由於項目的業務是不斷往前跑的，所以難免資料庫的表的量會越來越龐大，不斷的擠占硬碟空間。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資料是很有必要的。在我們項目中由於不清理資料，一個表占的空間竟然達到了4G之多。想想有多可怕...

  這裡介紹的是用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、建立預存程序供事件調用delimiter//drop procedure if exists middle_proce//create procedure middle_proce()beginDELETE FROM jg_bj_comit_log WHERE comit_time < SUBDATE(NOW(),INTERVAL 2 MONTH);DELETE FROM jg_bj_order_create WHERE created_on < SUBDATE(NOW(),INTERVAL 3 MONTH);DELETE FROM jg_bj_order_match WHERE created_on < SUBDATE(NOW(),INTERVAL 3 MONTH);DELETE FROM jg_bj_order_cancel WHERE created_on < SUBDATE(NOW(),INTERVAL 3 MONTH);DELETE FROM jg_bj_operate_arrive WHERE created_on < SUBDATE(NOW(),INTERVAL 3 MONTH);DELETE FROM jg_bj_operate_depart WHERE created_on < SUBDATE(NOW(),INTERVAL 3 MONTH);DELETE FROM jg_bj_operate_login WHERE created_on < SUBDATE(NOW(),INTERVAL 3 MONTH);DELETE FROM jg_bj_operate_logout WHERE created_on < SUBDATE(NOW(),INTERVAL 3 MONTH);DELETE FROM jg_bj_operate_pay WHERE created_on < SUBDATE(NOW(),INTERVAL 3 MONTH);DELETE FROM jg_bj_position_driver WHERE created_on < SUBDATE(NOW(),INTERVAL 3 MONTH);DELETE FROM jg_bj_position_vehicle WHERE created_on < SUBDATE(NOW(),INTERVAL 3 MONTH);DELETE FROM jg_bj_rated_passenger WHERE created_on < SUBDATE(NOW(),INTERVAL 3 MONTH);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、建立Evnet事件drop event if exists middle_event;create event middle_eventon schedule every 1 DAY STARTS ‘2017-12-05 00:00:01‘on completion preserve ENABLEdo 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;

 

MySQL資料庫 Event 定時執行任務