SQL Database Memory Usage!

Hi guys,

On NextGen Gallery plugin. Go to overview area and it has something similar this:

Server Settings

* Operating System : Linux
* Server : Apache
* Memory usage : 15.44 MByte
* MYSQL Version : 5.0.32-Debian_7etch8-log
* SQL Mode : Not set
* PHP Version : 5.2.8
* PHP Safe Mode : On
* PHP Allow URL fopen : On
* PHP Memory Limit : 16M
* PHP Max Upload Size : 12M
* PHP Max Post Size : 12M
* PHP Max Script Execute Time : 30s
* PHP Exif support : Yes ( V1.4 )
* PHP IPTC support : Yes
* PHP XML support : Yes

Wheres the source code for this??? Of is there a plugin built for this?

I need something to tell me whats maxxing out my database memory!