Usage and Configuration of the Oracle Shared Server pptx

5 Copyright © Oracle Corporation, 2002. All rights reserved. Usage and Configuration of the Oracle Shared Server 5-2 Copyright © Oracle Corporation, 2002. All rights reserved. Objectives After completing this lesson, you should be able to do the following: • Identify the components of the Oracle Shared Server • Describe the Oracle Shared Server architecture • Configure the Oracle Shared Server • Identify and explain usefulness of related data dictionary views 5-3 Copyright © Oracle Corporation, 2002. All rights reserved. Server Configurations • Dedicated server process • Shared server process 5-4 Copyright © Oracle Corporation, 2002. All rights reserved. Dedicated Server Processes Client Server User process Server process PMON DBWnSMON LGWRCKPT ARCn Instance SGA 5-5 Copyright © Oracle Corporation, 2002. All rights reserved. Oracle Shared Server Shared server processes Database server Client Snnn Snnn User process User process Snnn Instance SGA Dispatcher D003 Dispatcher D001 Dispatcher D002 5-7 Copyright © Oracle Corporation, 2002. All rights reserved. Benefits of Oracle Shared Server • Reduces the number of processes against an instance • Increases the number of possible users • Achieves load balancing • Reduces the number of idle server processes • Reduces memory usage and system overhead 5-8 Copyright © Oracle Corporation, 2002. All rights reserved. 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) ) ) 5-9 Copyright © Oracle Corporation, 2002. All rights reserved. 2 1 Database server Client Connecting User process User process Listener Dispatcher process D001 Dispatcher process D002 3 5-10 Copyright © Oracle Corporation, 2002. All rights reserved. PMON DBWn SMON LGWRCKPT ARCn Request Queue Response queue for (D002) Response queue for (D003) Instance SGA Processing a Request Shared server processes Database server client Snnn Snnn User process Listener Dispatcher D002 Dispatcher D003 Snnn Response queue for (D001) 4 5 3 2 1 6 Dispatcher D001 User process 5-12 Copyright © Oracle Corporation, 2002. All rights reserved. Oracle Shared Server: User session data is held in the SGA SGA User session data Cursor state Shared pool and other memory structures Stack space PGA Dedicated Server: User session data is kept in the PGA The SGA and PGA SGA Shared pool and other memory structures Stack space User session data Cursor state PGA [...]... SHARED_ SERVERS Specifies the number of server processes created when an instance is started up SHARED_ SERVERS = 6 S001 S005 S002 5-18 S003 S004 S006 Copyright © Oracle Corporation, 2002 All rights reserved MAX _SHARED_ SERVERS • • 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... learned how to: • Identify the components of the Oracle Shared Server • Describe the Oracle Shared Server architecture • Configure the Oracle Shared Server • Identify and explain usefulness of related data dictionary views 5-28 Copyright © Oracle Corporation, 2002 All rights reserved Practice 5 Overview This practice covers the following topics: • Configuring Oracle Shared Server • Defining LOCAL_LISTENER... S006 S008 S010 Copyright © Oracle Corporation, 2002 All rights reserved CIRCUITS • • Specifies the total number of virtual circuits that are available for inbound and outbound network sessions Contributes to total SGA size CIRCUITS = 100 5-21 Copyright © Oracle Corporation, 2002 All rights reserved SHARED_ SERVER_ SESSIONS • • Specifies the total number of Oracle Shared Server user sessions to allow... dedicated servers SHARED_ SERVER_ SESSIONS = 100 5-22 Copyright © Oracle Corporation, 2002 All rights reserved Related Parameters Other initialization parameters affected by Oracle Shared Server that may require adjustment: • LARGE_POOL_SIZE • SESSIONS 5-23 Copyright © Oracle Corporation, 2002 All rights reserved Verifying Setup • Verify that the dispatcher has registered with the listener when the instance...Configuring Oracle Shared Server • Required initialization parameters – DISPATCHERS – SHARED_ SERVERS • Optional initialization parameters – – – – 5-13 MAX_DISPATCHERS MAX _SHARED_ SERVERS CIRCUITS SHARED_ SERVER_ SESSIONS Copyright © Oracle Corporation, 2002 All rights reserved DISPATCHERS Specifies the number of dispatchers initially started for a given protocol... lsnrctl services • Verify that you are connected using shared servers by making a single connection then query V$CIRCUIT view to show one entry per shared server connection 5-25 Copyright © Oracle Corporation, 2002 All rights reserved Dynamic Views • • • • • • 5-27 V$CIRCUIT V $SHARED_ SERVER V$DISPATCHER V $SHARED_ SERVER_ MONITOR V$QUEUE V$SESSION Copyright © Oracle Corporation, 2002 All rights reserved Summary... TCP/IP IPC Copyright © Oracle Corporation, 2002 All rights reserved MAX_DISPATCHERS • • Specifies the maximum number of dispatcher processes that can run simultaneously Issues the ALTER SYSTEM command to add more dispatchers than initially started MAX_DISPATCHERS = 5 Dispatcher D004 Dispatcher D001 TCP/IP 5-16 Dispatcher D002 TCP/IP Dispatcher D003 IPC Dispatcher D005 Copyright © Oracle Corporation,... the following topics: • Configuring Oracle Shared Server • Defining LOCAL_LISTENER for instance registration • Using the Listener Control utility to verify services • Verifying shared server configuration and performance using V$ views • Verifying instance registration 5-29 Copyright © Oracle Corporation, 2002 All rights reserved . the following: • Identify the components of the Oracle Shared Server • Describe the Oracle Shared Server architecture • Configure the Oracle Shared Server • Identify. 5 Copyright © Oracle Corporation, 2002. All rights reserved. Usage and Configuration of the Oracle Shared Server 5-2 Copyright © Oracle Corporation,