Oracle in Action - Oracle 10g Database Administration Concepts and Implementation Made Simple - page 119

How Oracle works in Dedicated Server Mode?
After studying Shared Server Mode of Oracle System, Dedicated
Sever Mode is just piece a cake. In Dedicated Server mode there
is neither Request/Response Queues nor any Dispatcher process.
Whenever a user connects to Oracle Instance, one new Server
process gets created to serve him/her.
Figure 5-3: Background processes of Oracle Instance. Oracle Instance
running under Dedicated Server Mode is shown. Oracle running under
Dedicated Server mode works the same as Shared Server mode except
that a new server process gets created to serve the new logged in user.
Idle Time of Server process(es) will be more compared to Shared
Server environment. For unlimited resources, always go with Dedicated
Server Mode otherwise stick with Shared Server Mode.
To better visualize a Dedicated Server mode, think of a very
luxurious restaurant where they have one waiter dedicated for
each new customer entering the restaurant as shown in Figure 5-
4 and will stay with them all the time (waiting for their request)
unless they leave the restaurant or the husband say to him, “Can
you let me have some private discussion with my wife”. This is
called the restaurant running under Dedicated Waiter (Server)
environment.