Re: multiple forums in a single database – Change prefix to what?
If you want multiple forums, you need to do multiple installations, and each bbPress installation will be in a directory of its own, and the config.php in each individual directory should have a unique table prefix, as Sam suggested, like bb1_, bb2_.
In that case, each forum would be access with a different URL as well.
Maybe your site is at http://www.website.com . A normal bbPress installation would be in something like http://www.website.com/forums/ or http://www.website.com/bbpress/ . To have multiple forums, you would access them like this:
and the associated directories on the server would be
If you just want multiple forums or subforums in your bbPress installation, you just need to install one time, then set up the forums/subforums within bbPress. You don’t need multiple forum installations.