mariadb/mysql 事件实际上是如何工作的，如果每 1 天都安排一次？ ENDS 有什么用？ 它会完全禁用事件吗？

Question

  CREATE EVENT test_event5
  ON SCHEDULE EVERY 1 DAY  
  STARTS  TIMESTAMP(CURRENT_DATE)+ INTERVAL 1 DAY 
  ENDS  TIMESTAMP(CURRENT_DATE)+ INTERVAL 1 DAY+ INTERVAL 1 HOUR
  ON COMPLETION PRESERVE ENABLE
  DO  --Any query here--

I have written this event but it I have a little confusion on STARTS date? What will be next STARTS and ENDS date after executing this. Suppose today is 2022-Jan-05, as per my code its STARTS and ENDS date will be 2022-Jan-06 which is next day. What will be the start date at 2022-Jan-06? Will it be change to 2022-Jan-07?

As per my understanding STARTS date be 2022-Jan-07 in the next day. What is the use of ENDS?

Need expert opinion. Thanks in advance.

Answer 1

STARTS defines when the event will begin to be active and ENDS defines when the event ceases to execute. Both do not move or change, they are static values .

Your event will never execute outside this defined time window.

You define a time window during which your event is able to execute in intervals defined in ON SCHEDULE EVERY , given that ON COMPLETION PRESERVE is defined otherwise it will only execute once and then dropped.