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Manual:Wiki family - MediaWiki
It is recommended to use a different DB for each wiki (By setting a different $wgDBname for each wiki). However if you are limited to a single database, you can use a ...
Mediawiki4Intranet/en - Wiki4Intranet
MediaWiki is a popular «Wiki»-system, written in PHP and originally created as the Wikipedia's engine. MediaWiki is very extensible — there is more than 1700 useful extensions, and it’s very easy to write a new one. Mediawiki4Intranet is a MediaWiki distribution containing many extensions and patches useful for intranet (and not only for intranet).
Manual:Configuring file uploads - MediaWiki
MediaWiki supports uploading and integration of media files. This page describes the technical aspects of this feature, see Manual:Image administration and Help:Images for general usage information.. Starting from MediaWiki version 1.1, uploads are initially disabled by default, due to security considerations.