November 22, 2014

Win a free ticket to RailsConf!

I have one free ticket to give away to RailsConf next week in Baltimore! Post a comment to win, and if you aren’t the winner, I’ll give you a discount code for Percona Live as a consolation prize.

Here’s the catch: you have to find at least one thing wrong with the following typical logrotate configuration for MySQL. This should be easy even if you’re not a MySQL expert :-)

About Baron Schwartz

Baron is the lead author of High Performance MySQL.
He is a former Percona employee.


  1. Ronald Bradford says:

    Not withstanding you should never roll your log file. See my views at

    aron perhaps you should expand on your post to the readers about issues with how to roll the slow query log, and about changes in log file writing in MySQL 5.5 that affects historical processes.

  2. Chunhui Huang says:

    When you run “flush logs”, the mysqld.log will be rename to mysqld.log-old

  3. John Paul Ashenfelter says:

    Sweet/thanks! Should I find you guys down here tomorrow or Tu?

  4. Baron Schwartz says:

    Vitaly, I either confused you, or you are extremely clever and funny :)

    I’ll write a blog post sometime about what’s wrong with the default logrotate scripts for MySQL. The free ticket goes to John!

  5. Vitaly Tskhovrebov says:

    * It’s a bit harder to ‘rotate’ mysql databases then a text files;
    * InnoDB row will not exceed 8000 bytes under some conditions;
    * MySQL is an additional point of failure;

    Is it enough? :-)

  6. Baron Schwartz says:

    For bonus points (but no bonus tickets), tell me what’s busted about logging to syslog with MySQL, too!

  7. John Paul Ashenfelter says:

    You don’t want the “create 600 mysql mysql” line — it’s commented out in the default config.

    But the real problem is you’re logging to a file and not syslog :)

  8. Baron Schwartz says:

    Everything. Finding things wrong with it is like shooting fish in a barrel. I’ll blog about it someday.

  9. W. Andrew Loe III says:


    What are the correct answers to the questions? What is busted with syslog logging?

  10. vegivamp says:

    Hmm. If I remember logrotate correctly, the compress gets executed before the flush-logs; so you run the risk of adding lines to an already-compressed logfile – and maybe lines added *during* compression will be lost depending on the compression utility’s behaviour.

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