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Each server process uses system resources such as
the memory and the CPU. Scaling to large user populations can consume a lot of
system resources. To support the ever-increasing demand for scalability, Oracle
introduced the Multi-Threaded Server (MTS) in Oracle7, known as the shared server
since Oracle9i.
Shared servers allow the Oracle instance to share a set of server processes across a
larger group of users. Instead of each client connecting to and using a dedicated
server, the clients use shared servers, which can significantly reduce the overall
resource requirements for serving large numbers of users.
In many systems there are times when the clients aren??™t actively using their server
process, such as when users are reading and absorbing data retrieved from the database.
When a client is not using its server process in the dedicated model, that server
Figure 3-6. Connecting with the Oracle Net Listener
74 | Chapter 3: Installing and Running Oracle
process still has a hold on system resources even though it isn??™t doing any useful
work.


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