Making MySQL NOT start up when Ubuntu starts

[Chanchao]

Hi,

I sometimes do some testing of PHP scripts on MySQL server, but I
don't really want to run MySQL all the time. (Uses up memory, etc.)

I tried cancelling out the script in /etc/rc.something , but
apparently the same script is also used for stopping MySQL again when
turning off the computer??

How does one do this? If a trash the script then I worry MySQL won't
shut down properly.

Cheers,
Chanchao