code: public void unregister_server() {
  
  	Util.out4.println("Entering Tango::unregister_server method");
  
  	if (Util._UseDb == true) {
  
  	    //
  	    // Mark all the devices belonging to this server as unexported
  	    //
  
  	    try {
  		db.unexport_server(ds_name.toString());
  	    } catch (final SystemException e) {
  		Except.print_exception(e);
  		System.exit(-1);
  	    } catch (final DevFailed e) {
  		Except.print_exception(e);
  		System.exit(-1);
  	    } catch (final UserException e) {
  		Except.print_exception(e);
  		System.exit(-1);
  	    }
  	}
  	Util.out4.println("Leaving Tango::unregister_server method");
      }
docs: Unregister a device server process from the TANGO database.
  
  If the database call fails, a message is displayed on the screen and the
  process is aborted