OHSecurity - Change Table Prefix
The Database Table Prefix Changer allows you to easily change your websites database table prefix with the click of a button. Using a weak or common table prefix makes it easier for hackers to attempt to compromise your website. If a hacker does know your table prefix, they will be able to generate SQL commands that they could run through vulnerable extensions if you have any installed.
Please be careful - if your website contains custom extensions that have been developed specifically for you - some functionality may become broken after changing your database table prefix.