Review this information to understand the Oracle Net Services configuration files and parameters for an Oracle RAC database.

Networking elements for the Oracle Database server and clients are preconfigured for most environments. The Easy Connect naming method is enabled by default and does not require a repository.

• Database Initialization Parameters for Database Service Registration
  An Oracle Database service automatically registers with the listeners specified in the LOCAL_LISTENER and REMOTE_LISTENER parameters.
• Net Service Names and the tnsnames.ora File
  The Oracle RAC database installation process creates a tnsnames.ora file on each node. This file acts as a repository of net service names.
• Net Service Names Created by Oracle DBCA
  Oracle Database Configuration Assistant (Oracle DBCA) creates net service names for database connections and instance connections.
• Listener Configuration and the listener.ora File
  Oracle recommends that you let the Oracle Agent manage Oracle listeners for Oracle Databases in an Oracle RAC environment.
• Net Services Profile File (sqlnet.ora)
  Use Oracle NETCA to create the Oracle Net Services profile, or the sqlnet.ora file.