Truncate Mysql Table Cron Job?

Question

I am having some trouble on how to Truncate a Mysql Table with a cron job. No matter what I try I can't seem to get the database to clear out the table.. Thanks for the help.

mysql -uderp_example -pexample -hlocalhost -Dexample -e"TRUNCATE TABLE juicebox"

I am using this:

http://i.stack.imgur.com/FUmow.png

&& /var/lib/mysql/fruitloops_juicebox adding the path still doesn't solve the issue... I don't understand whats wrong.

Answer 1

The most likely reason your command is failing is that you didn't provide an absolute path for mysql. Do it this way

/path/to/mysql -uderp_example -pexample -hlocalhost -Dexample -e"TRUNCATE TABLE juice box"
^^^^^^^^

It should work just fine.

It's because cron executes under an account which either does not have PATH defined or does not include a path to mysql.

---

Now there is another option - using a MySQL event

CREATE EVENT update_date_column 
  ON SCHEDULE EVERY 1 HOUR STARTS NOW()
  DO TRUNCATE TABLE juicebox;

If you'll decide to go with an event approach:

• use SHOW EVENTS to list created events with their attributes (eg status )
• use SHOW PROCESSLIST to check if the event scheduler is enabled. If it's ON you should see a process " Daemon " by user " event_scheduler ".
• use SET GLOBAL event_scheduler = ON; to enable the scheduler if it's currently not enabled.
• More on configuring event scheduler read here