Question: If so where can I find the installation?

Answer: 
no, it isn’t—only on server version:

<http://developer.apple.com/internet/opensource/osdb.html>
I do not believe it is. The easiest thing to do is to download it from [here](http://dev.mysql.com/downloads/mysql/5.1.html#macosx-dmg) (mysql.com) I install both it and the startup item included in the package.