You only need 1 database, but could have several if you want different versions of the server. That way you can switch between
Myra's or
MW's just by editing db.ini, swapping quest directories and restarting the emu.
Oh don't forget to download the latest
items.
Besides the database that the worldbuilders make, there are also quest files. Quests are DB dependant, so you would have to switch the files if you switched the DB's Mollymillions is curently the one doing the most with quests, and has some avaliable
here The reprocessor can automaticly edit the quests to work with your current DB.