Mysql使用Event定期清理數據

In order to delete data in a fixed time automatically, use mysql event;

• Login Mysql
• Check event_scheduler
  SHOW VARIABLES LIKE ‘event_scheduler’;
• If event_scheduler is OFF
  臨時：
  SET GLOBAL event_scheduler = 1
  永久：
  vim /etc/my.cnf
  event_scheduler=ON
• Create event

create event xxx
ON SCHEDULE
every 1 day starts ‘2019-03-18 12:00:00’
DO
delete from nightly_status
where STR_TO_DATE(forecast_day, ‘%Y-%m-%d’) < DATE_SUB(CURRENT_TIMESTAMP, INTERVAL 20 DAY);

• Check event
  show events;
• Delete event
  DROP EVENT [IF EXISTS] my_event_name;
• Open & Close event
  alter event my_test_event on completion preserve enable;
  alter event my_test_event on completion preserve disable;