13.oracle dba视频9.57g附赠经典辅助学习

1、Oracle Shared ServersObjectivesAfter completing this lesson you should be able to do the following:Identify when to use Oracle Shared ServersConfigure Oracle Shared ServersMonitor Shared ServersListenerEstablishing a Connection ing connection requestDedicated Server ProcessListenerServerprocessUser

2、processServerprocessUser SessionsPGAListenerUser SessionUser processUser Sessions: Dedicated ServerUser sessionsServer processServer processServer processUser sessionUser Sessions: Shared ServerListenerDispatcherServerprocessResponse queue for D001Response queue for D002InstanceSGAShared serverproce

3、ssesDatabase serverClient or middle tierS001S002UserprocessDispatcherD001DispatcherD002S000DispatcherD000Response queue for D000Processing a RequestUserprocess123465Common request queuefor alldispatchersSGAOracle Shared Server: User session data is held in the SGA.SGAShared pool and other memory str

4、ucturesCursor stateShared pool and other memory structuresStackspacePGADedicated server: User session data is kept in the PGA.StackspaceUser session dataCursor statePGAThe SGA and PGAUser session dataConfiguring Oracle Shared ServerRequired parameterDISPATCHERSOptional parametersSHARED_SERVERSMAX_SH

5、ARED_SERVERSCIRCUITSSHARED_SERVER_SESSIONSDISPATCHERS = “(PROTOCOL=TCP)(DISPATCHERS=2) (PROTOCOL=IPC)(DISPATCHERS=1)” DispatcherD001TCP/IPDispatcherD002IPCDispatcherD000TCP/IPDISPATCHERSSpecifies the number of dispatchers that are initially started for a given protocol.DISPATCHERSFull Notes PageSHAR

6、ED_SERVERS = 6 S000S001S002S003S004S005SHARED_SERVERSSpecifies the number of shared server processes created when an instance is started up, and retained during instance operation.MAX_SHARED_SERVERS = 10S000S001S002S003S004S005S006S007S008S009MAX_SHARED_SERVERSSpecifies the maximum number of shared

7、servers that can be startedAllows shared servers to be allocated dynamically based on the length of the request queueCIRCUITS = 100CIRCUITSSpecifies the total number of virtual circuits that are available for inbound and outbound network sessionsContributes to total SGA sizeSHARED_SERVER_SESSIONS =

8、100SHARED_SERVER_SESSIONSSpecifies the total number of Oracle Shared Server user sessions to allowEnables you to reserve user sessions for dedicated serversRelated ParametersOther initialization parameters affected by Oracle Shared Server that may require adjustment:LARGE_POOL_SIZE SESSIONSPROCESSES

9、LOCAL_LISTENERVerify that the dispatcher has registered with the listener when the database was started by issuing:Verify that you are connected using shared servers by making a connection and then query V$CIRCUIT view to show one entry per shared server connection.$ lsnrctl SERVICESVerifying Shared

10、 Server SetupVerifying Shared Server SetupFull Notes PageData Dictionary ViewsV$CIRCUITV$SHARED_SERVERV$DISPATCHERV$SHARED_SERVER_MONITORV$QUEUEV$SESSIONChoosing a Connection TypeUnless otherwise configured, Oracle Net connections will use:Shared server if one is availableDedicated server if a share

11、d server connection is not availableUsing local or directory naming, the connection type can be specified as part of the Net service alias.When Not to Use Shared ServerCertain types of database work should not be performed using shared servers:Database administrationBackup and recovery operationsBat

12、ch processing and bulk load operationsData warehouse operationsDispatcherServer processSummaryIn this lesson you should have learned how to:Identify when to use Oracle Shared ServersConfigure Oracle Shared ServersMonitor Shared ServersPractice 13 Overview: Oracle Shared ServersThis practice covers the following topics:Investigati