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What is a listener in Oracle?
The Oracle listener is a service that runs on the database host and receives requests from Oracle clients. Sometimes the listener forwards requests to the database server (Figure 8.3), and sometimes it redirects the client somewhere else where the database server listens for dedicated connections (Figure 8.4).
What is a listener service?
A service listener is an object that contains a network address that accepts incoming client requests on behalf of services. A service can have multiple listeners, and a listener can accept client requests on behalf of multiple services.
What is the use of service name in Oracle?
SERVICE_NAMES specifies one or more names by which clients can connect to the instance. The instance registers its service names with the listener. When a client requests a service, the listener determines which instances offer the requested service and routes the client to the appropriate instance.
What is Oracle Net Services TNS listener?
The function of the TNS listener is to receive connection requests from local or remote clients and to provide the client with a server process to which the client can connect. The listener can service multiple instances. For each instance, the listener keeps a list of services that provide access to that instance.
What is the difference between service name and Sid?
A SID is a unique name that uniquely identifies the database instance where as a service name is the Database TNS Alias that is given when users remotely connect to the database. The Service name is recorded in the tnsnames.
What is difference between Service Name and SID in Oracle?
Oracle SID is the unique name that uniquely identifies your instance/database where as Service name is the TNS alias that you give when you remotely connect to your database and this Service name is recorded in Tnsnames.