Listener Overview
Services coordinate their sessions with the help of a listener, a process on the server that receives connection requests on behalf of a client application. Listeners are configured to "listen on" protocol addresses for a database service or non-database service.
Protocol addresses are configured in the listener configuration file, listener.ora, for a database service or a non-database service. An Oracle9i or Oracle8i database service automatically registers its information with the listener, such as its service names, instance names, and load information. This feature, called service registration, does not require service configuration in the listener.ora file. Other services, including Oracle8 and Oracle7 database services, and the Oracle Enterprise Manager management tools, require service configuration in the listener.ora file.
Once the listener is configured, the listener may be managed with the Listener Control utility.
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