The shared server architecture also enables existing applications to scale up without making any changes to the application itself. When using shared server, clients do not communicate directly with a database's server process—a database process that handles a client's requests on behalf of a database. Instead, client requests are routed to one or more dispatchers. The dispatchers place the client requests on a common queue. An idle shared server from the shared pool of server processes picks up and processes a request from the queue. This means a small pool of server processes can serve a large number of clients. The following two figures show the basic difference between the shared server connection model and the traditional dedicated server connection model.
Dedicated Server Processes
Oracle provides Oracle Net Services which is a suite of components that provides a connectivity solution. Oracle Net Service consist of. Databases logically appear as services, you identify each database in your system by its service name. The database instance name refers to the SGA and processes that make up the instance, this is commonly referred as the Oracle System Identifier SID , normally a database is only associated with one instance apart from when using a RAC environment. There are two ways to connect to oracle dedicated or Shared Server, both could be running at the same time on the same server. There are 4 connection types. Oracle listener only runs on the server and listens for incoming client connections, a utility called lsnrctl is used to manage the listener process.
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Oracle Database creates server processes to handle the requests of user processes connected to an instance. A server process can be either of the following:. Your database is always enabled to allow dedicated server processes, but you must specifically configure and enable shared server by setting one or more initialization parameters.
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