Thread:Project:Support desk/Database error after upgrading/reply (3)

Let me get this straight:
 * In your database you still have the text of your "old" wiki.
 * The Special:Statistics page shows you information, which obviously are based on that "old" data.
 * But when you open a page then it is not there.

I am only guessing, but: What do you have in the page table? This table links a certain page name to the according text. I could imagine that a problem in this table (like the table has been emptied or so) could cause MediaWiki to no longer find pages and their text, although the text itself is still there.

Btw.: Just out of curiosity: Do you have a backup from before the update? This would be one of those cases, where - if I were you - I would use it.