In order for the listener to accept client requests to an Oracle8 or Oracle7 database, the listener.ora file must be configured with information about the database.
If the database is an Oracle8I database, static service information is not required in the listener.ora file. Service information is registered with the listener automatically through service registration. However, if you are using Oracle Enterprise Manager, static information for an Oracle8i database is required.
To configure database service information for a listener: