You can configure listener to register database service information
automatically with Oracle
Names servers. This prevents you from having to manually register
a database service with the Oracle
Names Control utility REGISTER
command.
To set a password for the listener:
In the navigator pane, expand Oracle Net Configuration > Local > Listeners.
Select a listener.
From the list in the right pane, select General Parameters.
Select the General tab.
Choose Register Services with Oracle Names.
Choose File > Save Network Configuration.