You can delete database servers from the SDF. When you delete the database server from the SDF, all configuration information about the database server will be removed from the SDF.
If you are deleting a database server that hosts a QMF catalog that other database servers share, you will get a message that lists the additional database servers. When you delete the selected database server that hosts a shared QMF catalog, all of the database servers that share the QMF catalog will also be deleted.