This plugin is to be used when you want to change the database prefix to any other of your chosing. With the use of this plugin you can easily replce your database prefix to other keyword and you don’t need to change it manyally.
It works really well… but, you have to make sure the change is made in wp-config.php. In my case, it changes all the prefix in the database, but for some reasons not in the file. I made it manualy and everything went fine.