by Jim 21 Dec 2012, 12:05
Try it without putting a prefix in there.. Leave it blank!
A database prefix is simply used to organize data in a database and prevent one type of data from interfering with another.
An example is, in a table, you have a table called "post." Let's say you want to install a forum on a website. One of the default forum tables is named "post." To prevent the forum table from interfering with your other table, a prefix is added, preferably "forums_post." This will separate the forums for your regular post.
For naming the prefixes, people name them to whatever suitable. If it's a forum, then forum_, or if a blog, then blog_ is more suitable.
I hope that helps.