A server that is configured to allow many user processes to share very few server processes, so the number of users that can be supported is increased. With a shared server configuration, many user processes connect to a dispatcher. The dispatcher directs multiple incoming network session requests to a common queue. An idle shared server process from a shared pool of server processes picks up a request from the queue. This means a small pool of server processes can serve a large number of clients. Contrast with dedicated server.
Oracle Net Services Configuration Overview
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