Listen Software’s How To: The Listener Server

Configuration Files

Listener.ora

Includes the service names and addresses of all listeners on a machine, the
SIDs for the databases they listen for, and various control parameters used by the listener.

Oracle Name Server

Using the Oracle Name server, the clients do not need to know where the database
is located. The only requirement is for the client to know the address
of the name server. When the user wants a connection, Net 8 connects to
the name server, resolves the address, and connects to the address
given by the name server.

Connecting to the Server

The client uses both the tnsnames.ora file and the sqlnet.ora file
to make a connection with the server. TNSNames contains the names
of services on the network; whereas, sqlnet.ora contains client
profile information and Oracle Name Servers if used.

The server uses the listener.ora file
to create services that listen
for connection requests. The listener
service responds to incoming
requests by routing them to
the appropriate instance. The listener
server uses the listener.ora file to
boot and configure one or more listeners.
A listener service after routing
the connection is ready to respond to
the next request for information
(service name to connection descriptor).

The listener spawns a new process
or redirects the connection to
an existing process. Now the
listener is no longer involved.

LSNRCTL

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