Its always a fact that Microsoft does not support modifications to database schemas or database structures of SharePoint. These changes can be overwritten by service packs, upgrades or new versions of the product.

But.... still.... i came accross an article by Andy May which contained a link to the MSDN of microsoft where Microsoft describes each table of the SharePoint database. It still contains a Microsoft standard warning at the top. :)

So, whats the reason for this? Why listing the database tables?

The link to MSDN can be found at:

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/spptsdk/html/tsdbTables_SV01051532.asp

The article of Andy May can be found at: