Sometimes if your wordpress DB is down, you should normally get an error saying that the DB is unavailable and then some messages will appear with the possible cause of this, like the DB name is not found, the settings in the wp-config folder are wrong, and the like. However there is a case that surprise surprise you get on the page with the INSTALLATION of wordpress and you’ve just lost your WP blog.
The file is found in wp-admin/install.php
As a good rule of thumb, it’s advisable to delete all readme.txt, nfo, info files from all plug-ins, there have been reports of some chinese bots crawling wordpress blogs for these, so save yourself some bandwidth and delete those
In order to make sure this doesnt happen at all, there are 3 methods