DISPATCHERS: Sets up dispatcher processes in a shared server architecture.  MAX _DISPATCHERS: The maximum number of dispatcher processes that can run concurrently is specified by this parameter.  SHARED_SERVERS: The server will only have a few shared server processes. The number of shared servers is determined during the starting process.  MAX_SHARED_SERVERS: This parameter specifies the maximum number of concurrent shared server processes.  SHARED_SERVER SESSIONS: This is the only option required for using shared servers and it specifies the maximum number of concurrent sessions for shared server connections.