Server Configurations:

• Dedicated server PROCESS
• Shared server process

The server process created on BEHALF of each USER process is CALLED a dedicated server process (or shadow process).Shared server architecture removes the need for a dedicated server process for each connection.
A dispatcher routes multiple incoming network session requests to a pool of shared server processes. 
An idle shared server process from a pool of shared server processes picks up a request from a common queue, which does mean a small number of shared servers can do the same AMOUNT of processing as many dedicated servers.

Server Configurations:

The server process created on behalf of each user process is called a dedicated server process (or shadow process).Shared server architecture removes the need for a dedicated server process for each connection.
A dispatcher routes multiple incoming network session requests to a pool of shared server processes. 
An idle shared server process from a pool of shared server processes picks up a request from a common queue, which does mean a small number of shared servers can do the same amount of processing as many dedicated servers.