6.10.3 Net Service Names Created by DBCA

DBCA creates net service names for connections.

• Net Service Names for Database Connections
  Clients that connect to any instance of Oracle RAC use the SCAN in the connect descriptor. You can also use net service names to connect to Oracle RAC.
• Net Service Names for Instance Connections
  Clients that connect to a particular instance of the database use the net service name for the instance.