Manager Oracle Process

Server Process
单一服务进程(Dedicated Server Processes)


共享服务进程(Shared Server Process)

To request a dedicated server connection when Oracle is configured for shared server, users must connect using a net service name that is configured to use a dedicated server. Specifically, the net service name value should include the SERVER=DEDICATED clause in the connect descriptor.

Configuring Oracle for the Shared Server

Parameter	Description
The following parameter is required by shared server:
DISPATCHERS	Configures dispatcher processes in the shared server architecture.
The following parameters are optional (if not specified, Oracle selects defaults):
MAX_DISPATCHERS	Specifies the maximum number of dispatcher processes that can run simultaneously.
SHARED_SERVERS	Specifies the number of shared server processes created when an instance is started up.
MAX_SHARED_SERVERS	Specifies the maximum number of shared server processes that can run simultaneously.
CIRCUITS	Specifies the total number of virtual circuits that are available for inbound and outbound network sessions.
SHARED_SERVER_SESSIONS	Specifies the total number of shared server user sessions to allow. Setting this parameter enables you to reserve user sessions for dedicated servers.
Other parameters affected by shared server that may require adjustment:
LARGE_POOL_SIZE	Specifies the size in bytes of the large pool allocation heap. Shared server may force the default value to be set too high, causing performance problems or problems starting the database.
SESSIONS	Specifies the maximum number of sessions that can be created in the system. May need to be adjusted for shared server.