Resolve a disconnection between WordPress and MySQL

This guide is for users making changes around a hosting where WordPress is installed.

Following a change in your Web hosting offer (migration from the old hosting plan v1 60 GB to the current offers), you may need to update the connection between the MySQL/MariaDB database and your WordPress site (to avoid the "error establishing a database connection" error for example) and thus restore the link between WordPress and the MySQL/MariaDB database.

Elements to Modify

Here are the details to adapt in the wp-config.php file to make your WordPress site work (generally, a prefix has simply been added before the existing database name and username):

1. the name of the MySQL database (bddname before, abcd_bddname after, for example)
2. the MySQL database host server (mysql.domain.xyz before, abcd.myd.infomaniak.com after, for example)
3. the username accessing the MySQL database (userbdd before, abcd_userbdd after, for example)

Modify the wp-config.php file of WordPress

To do this:

1. retrieve and keep your current MySQL information according to the list above
2. create an FTP account
3. Connect via FTP
4. edit the wp-config.php file located in the root folder of your WordPress
5. find the relevant paragraph and update the 3 pieces of information (according to the list above)
6. save the file and that's it, your WordPress will now connect to the correct database