Event doesn't work

Question

I have a working command:

UPDATE ads SET ad_points = ad_points - 20

And I would like to perform this action every day.

After creating the event in phpMyAdmin (MYSQL) nothing happens (on the next day, etc.):

CREATE EVENT daily_pointsmin
    ON SCHEDULE
      EVERY 1 DAY
    COMMENT 'Subtracts twenty points from all the ads on every day.'
    DO
      UPDATE ads SET ad_points = ad_points - 20;

What can be the reason? The DB is in MYISAM, the tables are in InnoDB.

I've tried this already (including db in code):

UPDATE indikatr_main.ads SET ad_points = ad_points - 20

Answer 1

To enable or disable the execution of scheduled events, it is necessary to set the value of the global event_scheduler system variable. This requires the SYSTEM_VARIABLES_ADMIN or SUPER privilege. link

GRANT EVENT ON myschema.* TO jon@ghidora;

Or you may need to add super privilege using phpmyadmin link

Go to PHPMYADMIN > privileges > Edit User > Under Administrator tab Click SUPER > Go

Answer 2

(I'm not answering the Question as Asked, but rather suggesting how to make things better in the long run.)

Updating entire tables, especially on a regular basis, is a serious performance hit if the table is large. Also, it is a sign of a dubious schema design.

One thought... Don't blindly increment all the rows. Instead, compute the offset in every SELECT -- do some simple arithmetic based on the current date and the original date for the row. (Subtract, then multiply by 20.)

Answer 3

The problem was that, the server set OFF the "Event scheduler status", so I had to write cron jobs instead SQL events.