Analysis and solution of the reasons why MySQL scheduled tasks cannot be executed normally

Preface

When using database scheduled tasks, the scheduled tasks often fail to execute. This article analyzes and summarizes the causes and solutions to this problem.

Cause analysis and solutions

When we find that the MySQL scheduled task is not executed, first check whether the [Last Run] time in the scheduled task is correct to determine whether it is executed normally. If it is executed normally, you need to consider whether the event logic is incorrect.

If the last run time is empty or incorrect, you need to check whether the database has a scheduled task enabled. You can query by executing the following query statement:

show VARIABLES like '%event_schedule%'

If the result is ON, it means that the database has enabled the scheduled task, and if it is OFF, it has not.

If the query result is OFF, there are two solutions:

1. Set directly in the database

SET GLOBAL event_scheduler = ON;

This method takes effect immediately, but will become invalid after the database is restarted .

2. Make changes in the database configuration file

Add the following code to the [mysqld] module in my.ini:
event_scheduler=ON
This method requires the database to be restarted to take effect and will not become invalid when the database is restarted .

After starting the scheduled task of the database, you also need to check whether your own scheduled task is executable. Execute the following query statement in the database:
show events
Check whether the Status in the query result is correct. If the result is ENABLE , it means it has been started.

If the status is not ENABLE, we need to change it to ENABLE in the status bar of the scheduled task.

Make scheduled tasks execute quickly

Some scheduled tasks are executed once a day or longer. If you want time to flow naturally to test it will be troublesome. At this time, we need to modify the time of the database server according to the plan, so that we can quickly test whether the scheduled task can be executed normally.

Summarize

This concludes this article on the reasons why MySQL scheduled tasks cannot be executed normally and the solutions. For more relevant MySQL scheduled tasks, please search for previous articles on 123WORDPRESS.COM or continue to browse the following related articles. I hope everyone will support 123WORDPRESS.COM in the future!