At the time of Server failure, you would want your MySQL to start at the boot.
To achieve the same follow the below steps at the prompt.
>cd /etc/rc.d/rc3.d
>ln -s /etc/rc.d/init.d/mysql S98mysql
The second line will create a symlink in the above directory. By doing this you are asking your server to run it during level 3 start up.
However you can also run the below commands manually post startup.
Using files in /etc/rc.d/init.d directly, for example:
/etc/rc.d/init.d/mysql start
/etc/rc.d/init.d/mysql stop
-Death