oracle网络服务及管理工具

《oracle网络服务及管理工具》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、2021/7/9第三讲Oracle网络服务及管理工具本章目标2021/7/9Listener2021/7/9ListenerContinue2021/7/9AlistenerprocesscanlistenformorethanonedatabaseMultiplelistenerscanlistenonbehalfofasingledatabasetoperformloadbalancingThelistenercanlistenformultipleprotocolsThedefaultnameofthelistenerinOracleNet

2、isLISTENERThenameofthelistenermustbeuniqueperlistener.orafileConnectionMethods2021/7/9SpawnandBequeathConnections2021/7/9SpawnandBequeathConnections2021/7/91.Thelistenerreceivesaclientconnectionrequest.2.Thelistenerstartsadedicatedserverprocess,andthededicatedserverinheritsth

3、econnectionrequestfromthelistener.3.Theclientisnowconnecteddirectlytothededicatedserver.If,becauseoftheoperatingsystemorprotocol,aconnectioncannotbepassedbetweentwodifferentprocessesonthesamemachine,aredirectmusttakeplaceinstead.Note:Whenaclientdisconnects,theclients’dedicate

4、dserverprocesscloses.DirectHand-OffConnections2021/7/9DirectHand-OffConnections2021/7/91.Thelistenerreceivesaclientconnectionrequest.2.Thelistenerhandstheconnectrequestdirectlytothedispatcher.3.Theclientisnowconnectedtothedispatcher.RedirectedSession2021/7/9RedirectedSession2

5、021/7/91.Theclientestablishesaconnectiontothelistenerbyusingtheconfiguredprotocolandsendsthelisteneraconnectpacket.2.ThelistenerchecksthattheSIDisdefined.Ifitis,thelistenerwillspawnanewthreadorprocesstoservicethenewconnection.AnIPCconnectionisthenestablishedbetweenthelistener

6、andthenewprocessorthread.3.ThenewprocessorthreadselectsanewTCP/IPportfromthelistoffreeuser-definedportsandpassesthisinformationbacktothelistener.4.ThelistenerinsertsthisnewportintoaredirectpacketandsendsitbacktotheclientandtheoriginalTCPsocketbetweentheclientandthelistenerist

7、henreset.5.AnewTCPconnectionisestablishedtotheredirectaddressspecifiedintheredirectpacketandaconnectpacketisthenforwardedtothededicatedserverprocess.6.ThededicatedserverprocesscannowfinallyaccepttheincomingconnectionandforwardsanACCEPTmessagebacktotheclient.Listener服务配置及注册202

8、1/7/9StaticServiceRegistration:Thelistener.oraFile2021/7/92021/7/9C