MySQL資料庫 Event 定時執行任務

由於專案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。在我們專案中由於不清理資料，乙個表佔的空間竟然達到了4g之多。想想有多可怕...

這裡介紹的是用mysql 建立乙個定時器event，定期清除掉之前的不必要事件。

#1

、建立儲存過程供事件呼叫
delimiter
//drop
procedure
ifexists 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、建立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;

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