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The client contacts the Listener over the network.
2. The Listener detects an incoming request and introduces the requesting client to
an Oracle server process.
3. The Listener introduces the server to the client by letting each know the other??™s
network address.
4. The Listener steps out of the way and lets the client and server communicate
directly.
Figure 3-5. Accessing a database
Datafiles
Application
Server
NETWORK
Client
Client
NETWORK
SGA
Database Buffer
Cache Shared Pool Redo Log
Buffer
Local
IPC
Server
Local
Client Server Server
Accessing a Database | 73
Once the client and the server know how to find each other, they communicate
directly. The Listener is no longer required.
Figure 3-6 illustrates the steps outlined above for establishing a networked connection.
Network traffic appears as dotted lines.
The Shared Server/Multi-Threaded Server
The server processes shown in the diagram are dedicated; they serve only one client
process. So, if an application has 1,000 clients, the Oracle instance will have 1,000
corresponding server processes.


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