File update-message of Package mysql

Updating to MySQL 5.5
=====================

You are upgrading your MySQL to version 5.5. Although smooth migration should
be possible, it is highly recommended to backup your data first.

You can learn more about changes from following links:

   http://dev.mysql.com/doc/refman/5.1/en/upgrading-from-previous-series.html
   http://dev.mysql.com/doc/refman/5.5/en/upgrading-from-previous-series.html

Your MySQL is currently *stopped*. You should now backup your data and continue
by issuing following commands that will start automatic migration:

   touch /var/lib/mysql/.force_upgrade
   rcmysql restart