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

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

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In a dedicated server environment, a listener (the listener must be running on the same computer on which the server is running) starts a separate dedicated server process for each incoming client connection request. Based on the operating system and the transport protocol, the listener can use any one of the following methods to establish a client/server connection:

1. Bequeath connection: In this case, the following events occur in the sequence given below:



• The listener receives the client connection request.


• The listener starts a dedicated server process, and the dedicated server process inherits the connection request from the listener.


• The client is now connected directly to the dedicated server process.


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



• The listener receives the client connection request.


• The listener starts a dedicated server process.


• The dedicated server process informs the listener of its listening protocol address.


• The listener passes the protocol address to the client in a redirect message and terminates the connection.


• The client connects to the dedicated server process directly by using the protocol address provided in the redirect message.

However, if the client and the database server both exist on the same computer, the client connection can be passed directly to a dedicated server process without going through the listener. The dedicated server process is started by the application (not by the listener) that initiates the session.

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