database service registation

For a listener to forward client connections to an instance, the listener must know the name of the instance and where the instance’s ORACLE_HOME is located. The listener can find this information in two ways:

1、Dynamic service registration: Oracle8i, Oracle9i, and Oracle Database 10g instances automatically register with the default listener on database startup. No additional listener configuration is required for the default listener.

2、Static service registration: The earlier releases of the Oracle database do not automatically register with the listener and, therefore, require that the listener configuration file contain a list of all database services that the listener will serve. You may still choose to use static service registration with newer releases if:
- Your listener is not on the default port of 1521, and you do not want to configure your instance to register with a nondefault port.
- Your application requires static service registration.

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