The act of connecting creates a communication pathway between a user process and an Oracle Server. As is shown in the figure above, the User Process communicates with the Oracle Server through a Server Process. The User Process executes on the client computer. The Server Process executes on the server computer, and actually executes SQL statements submitted by the system user.
The figure shows a one-to-one correspondence between the User and Server Processes. This is called a Dedicated Server connection. An alternative configuration is to use a Shared Server where more than one User Process shares a Server Process.
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