Adminer (formerly phpMinAdmin) is a full-featured MySQL management tool for WordPress. Adminer consists of a single file ready to deploy to the target server. This plugin include this tool in WordPress for a fast management of your database. Adminer is also used without this plugin and WordPress.
This plugin supports Multisite Installs only as Network Admin; add an menu item on Settings and also an link to WP Admin Bar to the item Network Admin.
Download and more info: http://wordpress.org/plugins/adminer/