How to schedule a stored procedure in MySQL

Question

I have this stored procedure. How can I run this for example with intervals of 5 seconds? Like a routine for eliminate data with a time-stamp older than one day?

DROP PROCEDURE IF EXISTS `delete_rows_links` 
GO

CREATE PROCEDURE delete_rows_links
BEGIN 

    DELETE activation_link
    FROM activation_link_password_reset
    WHERE  TIMESTAMPDIFF(DAY, `time`, NOW()) < 1 ; 

END 

GO

Slaveholder

Do you really need to run it each 5 second? – Example

nop, with interval of 6 hours is fine. But to test is more easy with seconds :) – Slaveholder

Running anything automatically every 5 seconds is probably a really bad idea. Try running it once a day, or once an hour, so you don't completely kill your performance. – Tesler

I also wouldn't bother re-creating the stored procedure every time you run it. Then again, I wouldn't even bother with a stored procedure. It's a simple DELETE statement... just execute it using whichever scheduling method you prefer. – Tesler

Answer 1

You can use mysql scheduler to run it each 5 seconds. You can find samples at http://dev.mysql.com/doc/refman/5.1/en/create-event.html

Never used it but I hope this would work:

CREATE EVENT myevent
    ON SCHEDULE EVERY 5 SECOND
    DO
      CALL delete_rows_links();

Example

i only replace delete_rows_links with this, but apparently doesn't work. DELETE FROM database_charts.activation_link_password_reset WHERE TIMESTAMPDIFF(DAY, time, NOW()) < 1; – Slaveholder

@user455318: "doesn't work" --- isn't an explanation. What mysql version do you use? What error did you get? – Example

i cant enable the SET GLOBAL event_scheduler = ON; give me an error of connection – Elison

@user773961: uhm, php?!?!? perform everything directly in mysql console. – Example

What mysql version do you use? scheduler is available only in mysql 5.1 – Example

ok. point of situation. the SHOW PROCESSLIST\G show the process event_scheduler, but any row is deleted in the interval of 5 seconds – Elison

oh ... 5.0.51a. probably is the problem – Elison

I think this should be DO CALL delete_rows_links(); – Zonate

I have a similar question. If you have some free time, please take a look at it. – Mosquito

Make sure to also turn on the mysql scheduler: SET GLOBAL event_scheduler = ON; – But

Answer 2

I used this query and it worked for me:

CREATE EVENT `exec`
  ON SCHEDULE EVERY 5 SECOND
  STARTS '2013-02-10 00:00:00'
  ENDS '2015-02-28 00:00:00'
  ON COMPLETION NOT PRESERVE ENABLE
DO 
  call delete_rows_links();

Evapotranspiration

Answer 3

In order to create a cronjob, follow these steps:

1. run this command : SET GLOBAL event_scheduler = ON;

2. If ERROR 1229 (HY000): Variable 'event_scheduler' is a GLOBAL variable and should be set with SET GLOBAL: mportant

It is possible to set the Event Scheduler to DISABLED only at server startup. If event_scheduler is ON or OFF, you cannot set it to DISABLED at runtime. Also, if the Event Scheduler is set to DISABLED at startup, you cannot change the value of event_scheduler at runtime.

To disable the event scheduler, use one of the following two methods:

1. As a command-line option when starting the server:

   --event-scheduler=DISABLED
   

2. In the server configuration file (my.cnf, or my.ini on Windows systems): include the line where it will be read by the server (for example, in a [mysqld] section):

   event_scheduler=DISABLED
   

   Read MySQL documentation for more information.

    DROP EVENT IF EXISTS EVENT_NAME;
     CREATE EVENT EVENT_NAME
    ON SCHEDULE EVERY 10 SECOND/minute/hour
    DO
    CALL PROCEDURE_NAME();
   

Lacielacing

Answer 4

If you're open to out-of-the-DB solution: You could set up a cron job that runs a script that will itself call the procedure.

Goatskin

Cron cannot run command each 5 seconds. He is good with 6 hours interval though. – Example

Yeah I replied with OP's comment in mind, I should have specified it! – Goatskin

Unfortunately, before MySQL 5.1 this seems to be the only option, as events were introduced with that version. – Pines