From Whatis

SYSTEM REBOOTED - During a site relocation the Wiki database was corrupted. Unlike the last time, however, the text (albeit unformatted) of the Wiki has been saved. You can download the XML file here (open it in a web browser) and search for your name and pull out the raw unformatted text.

This is why Xadium hates and does not ever trust databases. Flat file might be more inefficient from an I/O standpoint but you rarely have to deal with this nonsense.