How is a client/server connection established in a shared server environment?

Are you preparing for IT certification? With practice questions, study notes, interactive quizzes, tips and technical articles, uCertify PrepKits ensure that you get a solid grasp of core technical concepts to ace your certification exam in first attempt.

How is a client/server connection established in a shared server environment?

Rating:

In a shared server configuration, a fixed number of shared server processes are automatically started when an Oracle instance starts. However, clients are not directly connected to shared server processes. They are connected to their corresponding dispatcher processes instead. The dispatcher processes work as a mediator between the clients and the shared server processes. To establish a client/server connection in a shared server environment, the listener can use any one of the following methods:

1. Direct hand-off connection: In this case, the following events occur:



• First, the listener receives the client connection request.


• Then, the listener hands the connection request directly to a dispatcher.


• Finally, the client connects to the dispatcher.


2. Redirect connection: In this case, the following events occur:



• First, the listener receives the client connection request.


• Then, the listener issues a redirect message to the client, containing the protocol address of a dispatcher.


• Finally, the client terminates the network session to the listener and establishes a network session to the dispatcher by using the network address provided in the redirect message.

The listener uses the direct hand-off method whenever possible. Redirect method is used when dispatchers are remote to the listener.

Rating: