To unregister a database server from Plesk:
1. Go to Tools & Settings > Database Servers.
2. Select the checkbox to the right of the database server’s hostname.
3. Click Remove.
4. Confirm the operation and click OK.
To unregister a database server that has databases or is assigned as default for hosting customers' databases:
- Delete databases from the database server:
- Go to Tools & Settings > Database Servers.
- Click the host name of the database server that you wish to unregister from Plesk.
- Select the checkbox in the upper left corner of the list to select all databases.
- Click Remove.
- Confirm removal and click OK.
- Make another database server default:
- Click the Database servers shortcut in the path bar at the top of the screen.
- Click the host name of a database server that you wish to make default. This should be of the same database server type (MySQL or SQL Server) as the one you are going to delete.
- Click Preferences and select the Use this server as default for MySQL checkbox. If you have a SQL Server, select the Use this server as default for MS SQL checkbox.
- Click OK.
- Return to the list of database servers (Tools & Settings > Database Servers)
- Select a check box corresponding to the database server that you no longer need.
- Click Remove.
- Confirm the operation and click OK.