How to enable MySQL query logging

This will make MySQL log all received queries so you can see for yourself what happens on the database level.

Don't switch this on for production machines!

1. Edit your my.cnf:
   sudo vim /etc/mysql/my.cnf
2. In the [mysqld] section, add:
   log=/var/log/mysql.log
3. Restart your MySQL daemon. On Ubuntu:
   sudo service mysql restart

Note that your MySQL performance will suffer. But when you need to enable query logging for a debug fest, you probably don't care about that.