Deregistration of an instance from LDAP also removes all the node, or alias, objects, and the database objects referring to the instance.
Deregistration of the DB2® server on either a local or a remote computer requires the LDAP node name be specified for the server.
To deregister the DB2 server from LDAP:
When the DB2 server is deregistered, any LDAP node entry and LDAP database entries referring to the same instance of the DB2 server are also uncataloged.