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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.

WP Prefix Changer

Change your database prefix to other one with just one click.

Manish Kumar Agarwal

Latest version compatible with WordPress multisite installation <a href="http://www.youngtechleads.com/wordpress-change-table-prefix/" rel="nofollow ugc">here</a>
This plugin is mainly useful if you have not changed the database prefix at the time of installation and want to change post installation to make your website more secure and protected from SQL injections. With the use of this plug-in you can easily replace your database default prefix to any other prefix in single click.
As in most of the cases adminer are not changing the WordPress default database table prefix, it is easy for any hackers to inject to your database as all the default tables names are know for all. But if you modify your database tables prefix then your tables names are become unknown to outside world.
Plug-in URL: <a href="http://www.youngtechleads.com/change-wordpress-table-prefix/" rel="nofollow ugc">Change Table Prefix</a>
<h4>Features</h4>
<ul>
<li>Can change database tables prefix in post installation.</li>
<li>Tables prefix will change by single click.</li>
<li>Works well for multi site present in a single database.</li>
<li>Both the custom and random generated prefix facility available.</li>
<li>Minimize the SQL injection.</li>
</ul>

Change Table Prefix

It work perfectly, i don't give 5 stars because you should check if wp-config.php is writable before updating the DB to avoid dummy people to be locked out.

WP Prefix Changer vs Change Table Prefix