WordPress Database is like a brain for your entire WordPress site because every single information is stored in there thus making it hacker’s favourite target. Spammers and hackers run automated codes for SQL injections. Well, unfortunately, many people forget to change the database prefix while they install WordPress. This makes it easier for hackers to plan a mass attack by targeting the default prefix wp_. The smartest way you can protect your database is by changing the database prefix which is really easy to do on a site that you are setting up. But it takes a few steps to change the WordPress database prefix properly for your established site without completely messing it up.
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We recommend that you backup your WordPress Database before you perform anything suggested in this tutorial. It is important to keep daily backups of your site, we recommend BackupBuddy plugin for doing that. Next thing we recommend is that you redirect your visitors to a temporary maintenance page.
Change Table Prefix in wp-config.php
Open your wp-config.php file which is located in your WordPress root directory. Change the table prefix line from wp_ to something else like this wp_a123456_
So the line would look like this:
$table_prefix = 'wp_a123456_';
Note: You can only change it to numbers, letters, and underscores.
Change all Database Tables Name
You need to access your database (most likely through phpMyAdmin), and then change the table names to the one we specified in wp-config.php file. If you are using the cPanel WordPress hosting, then you can find the phpMyAdmin link in your cPanel. Look at the image below:
There are a total of 11 default WordPress tables, so changing them manually would be pain.
That’s why to make things faster, we have a SQL query that you can use.
RENAME table `wp_commentmeta` TO `wp_a123456_commentmeta`; RENAME table `wp_comments` TO `wp_a123456_comments`; RENAME table `wp_links` TO `wp_a123456_links`; RENAME table `wp_options` TO `wp_a123456_options`; RENAME table `wp_postmeta` TO `wp_a123456_postmeta`; RENAME table `wp_posts` TO `wp_a123456_posts`; RENAME table `wp_terms` TO `wp_a123456_terms`; RENAME table `wp_termmeta` TO `wp_a123456_termmeta`; RENAME table `wp_term_relationships` TO `wp_a123456_term_relationships`; RENAME table `wp_term_taxonomy` TO `wp_a123456_term_taxonomy`; RENAME table `wp_usermeta` TO `wp_a123456_usermeta`; RENAME table `wp_users` TO `wp_a123456_users`;
You may have to add lines for other plugins that may add their own tables in the WordPress database. The idea is that you change all tables prefix to the one that you want.
The Options Table
WordPress stores all the global options in the Options table. In this table, there are some entries which also need to have their prefix changed. To retrieve a list of all the entries that are using the wp_ prefix and needs changing, use the following SQL query:
SELECT * FROM `wp_a123456_options` WHERE `option_name` LIKE '%wp_%'
The WordPress UserMeta table contains all the information about registered users, such as personalised settings. In this table there are also a number of entries that need to have their prefix changed. To retrieve a list of all entries that are using the wp_ prefix, use the following SQL query:
SELECT * FROM `wp_a123456_usermeta` WHERE `meta_key` LIKE '%wp_%'
Number of entries may vary on how many plugins you are using and such. Just change everything that has wp_ to the new prefix.
Backup and Done
You are now ready to test the site. If you followed the above steps, then everything should be working fine. Now, you should make a new backup of your database just to be on the safe side.