Usage and Configuration of the Oracle Shared Server pptx

Usage and Configurationof the Oracle Shared Server

Server Configurations

• Dedicated server process• Shared server process

Dedicated Server Processes

Oracle Shared ServerShared server

Database serverClient

D001 DispatcherD002

Benefits of Oracle Shared Server

• Reduces the number of processes against an

Using a Dedicated Server with Oracle Shared Server

TEST.world =

(DESCRIPTION = (ADDRESS =

(PROTOCOL = TCP) (HOST = stc-sun02) (PORT = 1521)

)

(CONNECT_DATA=(SERVICE_NAME=TEST.us.oracle.com) (SERVER=DEDICATED)

) )

Database serverClient

3

Processing a RequestShared server

Database serverclient

UserprocessListener

Oracle Shared Server: User session data is held in the SGA SGA

Usersession

Cursor state

Shared pool and other

memory structures

Stackspace PGA

Dedicated Server: User session data is kept in the PGA

The SGA and PGA

SGA

Shared pool and other memory structures

User session

Cursor state PGA

Configuring Oracle Shared Server

• Required initialization parameters

Specifies the number of dispatchers initially started for a given protocol

DISPATCHERS = "(PROTOCOL=TCP)(DISPATCHERS=2)\(PROTOCOL=IPC)(DISPATCHERS=1)"

TCP/IP

• Specifies the maximum number of dispatcher

processes that can run simultaneously

• Issues the ALTER SYSTEM command to add more dispatchers than initially started

S005S006

• Specifies the maximum number of shared servers

that can be started

• Allows shared servers to be allocated dynamically

based on the length of the request queue

MAX_SHARED_SERVERS = 10

S009S010

• Specifies the total number of virtual circuits that

are available for inbound and outbound network sessions

• Contributes to total SGA size

CIRCUITS = 100

• Specifies the total number of Oracle Shared Server

user sessions to allow

• Setting this parameter enables you to reserve user

sessions for dedicated servers

SHARED_SERVER_SESSIONS = 100

Related Parameters

Other initialization parameters affected by Oracle Shared Server that may require adjustment:

• LARGE_POOL_SIZE • SESSIONS

• Verify that the dispatcher has registered with the

listener when the instance was started by issuing:

• Verify that you are connected using shared servers

by making a single connection then query

V$CIRCUIT view to show one entry per shared server connection.

Verifying Setup

$ lsnrctl services

Dynamic Views

• V$CIRCUIT

• V$SHARED_SERVER• V$DISPATCHER

• V$SHARED_SERVER_MONITOR• V$QUEUE

• V$SESSION

In this lesson, you should have learned how to:

• Identify the components of the Oracle Shared

• Describe the Oracle Shared Server architecture

• Configure the Oracle Shared Server

• Identify and explain usefulness of related data

dictionary views

Practice 5 Overview

This practice covers the following topics:

• Configuring Oracle Shared Server

• Defining LOCAL_LISTENER for instance registration

• Using the Listener Control utility to verify services• Verifying shared server configuration and

performance using V$ views

• Verifying instance registration