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OracleDatabase12c最大化应用程序的可用性课件MaximumApplicationAvailabilitywithOracleDatabase12cKuassiMensah
DirectorProductManagementMaximumApplicationAvailabiliThefollowingisintendedtooutlineourgeneralproductdirection.Itisintendedforinformationpurposesonly,andmaynotbeincorporatedintoanycontract.Itisnotacommitmenttodeliveranymaterial,code,orfunctionality,andshouldnotberelieduponinmakingpurchasingdecisions.Thedevelopment,release,andtimingofanyfeaturesorfunctionalitydescribedforOracle’sproductsremainsatthesolediscretionofOracle.ThefollowingisintendedtooMyNextSessionOracleIn-DatabaseMapReduce:WhenHadoopMeetsExadata7/25/13,12:00–13:00,Room431MyNextSessionOracleIn-DatabProgramAgendaProblemstoSolveNewConceptsTransactionGuardApplicationContinuityApplicationDesignConsiderationsProgramAgendaProblemstoSolvProblemstoSolveUponDatabaseOutageFourProblemsConfrontApplicationsHangErrorsOutcomeofIn-FlightWorkResubmissionofIn-FlightWorkProblemstoSolveUponDatabaseHang->FastApplicationNotification(FAN)
ErrorsHandling?Notformalized
In-FlightWork?Lost!ResubmissionofIn-FlightWork?N/A!CurrentSituationHangCurrentSituationProgramAgendaProblemstoSolveNewConceptsTransactionGuardApplicationContinuityApplicationDesignConsiderationsProgramAgendaProblemstoSolvRecoverableErrorFormalizedOracleException.IsRecoverablepropertyApplicationsNolongerneedtomaintainownlistoferrorcodes
(e.g.,ora-1033,ora-1034,ora-xxx)
JDBCthrows
SQLRecoverableException
RecoverableErrorFormalizedDatabaseRequest
UnitofWorkPoolDataSourcepds=GetPoolDataSource();Connectionconn=getConnection(pds);PreparedStatementpstmt=……SQL,PL/SQL,localcalls,RPC …mit();conn.close();RequestBeginsRequestBody
UsuallyendswithCOMMITRequestEndsDatabaseRequest
UnitofWorkProgramAgendaProblemstoSolveNewConceptsTransactionGuardApplicationContinuityApplicationDesignConsiderationsProgramAgendaProblemstoSolvTransactionGuardToolthatsupportsknownoutcomeforeverytransactionWithoutTransactionGuard,retrycancauselogicalcorruptionUsedbyApplicationContinuityCanbeusedindependentlyofApplicationContinuity4.EnforceOutcomeWorkRequest2.DBCalls12cORACLEDatabase3.Errors4.ReliableCommitOutcomeTransactionGuardToolthatsupTransactionGuard–TypicalUsageUpondatabaseinstancecrashFANabortsdeadsessionApplicationgetsanerrorPoolremovesorphanconnectionfrompoolIf“recoverableerror”thenGetlastLTXIDfromdeadsessionObtainnewdatabasesessionGettransactionstatusTransactionGuard–TypicalUsTransactionGuardInActiongetConnection()Txn.Commit();getLastLTXID<newsession>Commitoutcome?COMMIT/ROLLBACKstarttransactionassignLTXIDCOMMIT?Return&PreserveCOMMITOUTCOMEClient/Mid-tierDatabaseTimeRecoverableErrorCOMMITGetLogicalTXIDSQL,PL/SQL,RPCResultsTGinActionTransactionGuardInActiongetOnServiceCOMMIT_OUTCOMEValues–TRUEandFALSEDefault–FALSEAppliestonewsessionsRETENTION_TIMEOUTUnits–secondsDefault–24hours(86400)Maximumvalue–30days(2592000)TransactionGuard
ConfigurationOnServiceTransactionGuard
TransactionGuardinOracledatabase12cJDBC-thin,ODP.NET,OCI,OCCICommitModels
LocalTXNAuto-commit,CommitonSuccessCommitembeddedinPL/SQLDDL,DCL,ParallelDDLRemote,DistributedExclusionsXAR/WDBLinksfromActiveDataGuardorReadOnlyTransactionGuardinOracledaProgramAgendaProblemstoSolveNewConceptsTransactionGuardApplicationContinuityDesignConsiderationsProgramAgendaProblemstoSolvApplicationContinuityMaskDatabaseOutageWhenSuccessfulReplaysin-flightworkonrecoverableerrorsMasksmanyhardware,software,network,storageerrorsandoutageswhensuccessfulImprovesenduserexperience5.ResponseWorkRequest2.DBCalls12cORACLEDatabase4.Replay3.ErrorsApplicationContinuityMaskDatPhasesinApplicationContinuity1-Capture2-Reconnect3-ReplayDemarcatesdatabaserequestHoldsoriginalcallswithbinds&validationManagesqueuesChecksrequesthasreplayenabledHandlestimeoutsCreatesanewconnectionValidatestargetdatabaseUsesTransactionGuardtoenforcelastcommitReplaysheldcallsContinuesreplay,ifuservisibleresultsmatch,basedonvalidationsContinuesrequestPhasesinApplicationContinuiApplicationContinuityInAction
Call1
Application
Proxy1
Proxy2RACDatabaseInstance1Instance2Instance3
Call2
Connection
ReplayContextOracleJDBCDriverApplicationContinuityInActiDEMODEMOSolutionCoverage
ApplicationContinuityforJavaClient
JDBC-ThindriverUCP,WebLogicServerDatabaseSQL,PL/SQL,RPCSelect,ALTERSESSION,DML,DDL,COMMIT/ROLLBACK/SAVEPOINTTransactionmodels:Local,Parallel,Remote,DistributedMutablefunctionsupportHardwareaccelerationoncurrentIntel&SPARCchipsSolutionCoverage
ApplicationExclusions
GlobalRequestTargetDatabaseDonotusedefaultdatabaseserviceExcludesXAForJava,deprecatedconcreteclassesRestrictedcallsAlterSystemAlterDatabaseNotsupportedforActiveDataGuardwithread/writedatabaselinksDoesnotsupport:LogicalStandbyGoldenGateExclusions
GlobalRequestTargRestrictions
WhenDoesReplayNotOccur?
NormalRuntimeReconnectReplayAnycallinsamerequestaftersuccessfulcommitindynamicmode
(default)arestrictedcalldisableReplayAPIErrorisnotrecoverableReconnectionfailureReplayinitiationtimeoutMaxconnectionretriesMaxretriesperincidentTargetdatabasenotvalidforreplayLastcallcommitted
indynamicmodeValidationdetectsdifferentresultsRestrictions
WhenDoesReplayProgramAgendaProblemstoSolveNewConceptsTransactionGuardApplicationContinuityApplicationDesignConsiderationsProgramAgendaProblemstoSolvApplicationAssessment
DecideWhattodoRequestBoundariesMarkRequestBoundaries,ifyouarenotusingOraclePoolsJDBCConcreteClassesReplacedeprecatedconcreteclasseswithJavainterfacesSideEffectsUsedisableAPIifadatabaserequesthasanexternalcallthatshouldnotbereplayedCallbacksEnsureacallbackisregisteredifstatechangesoutsideanyrequest(WLS/UCPlabelingincludedbydefault)MutableFunctionsGrantkeepingmutablevaluesifthesearecompatiblewithyourapplicationApplicationAssessment
DecideWSideEffectsWhenReplayisenabled,somecallsmayberepeated.
AppsmayneedtousedisableReplay()APItopreventthis:AutonomoustransactionsUTL_HTTP,
UTL_URLUTL_FILE,UTL_FILE_TRANSFER-filesoperationsUTL_SMPT,UTL_TCP,UTL_MAIL-sendingmessagesDBMS_PIPE,RPCs-toexternalsourcesDBMS_ALERT-emailorothernotificationsSideEffectsWhenReplayisenaConfigureJDBCReplayDriver
Setreplaydatasourceinpropertyfile
datasource=oracle.jdbc.replay.OracleDataSourceImplEnableApplicationContinuityonService
SetFAILOVER_TYPE=TRANSACTIONReviewsettingsfor:
REPLAY_INITIATION_TIMEOUT=1800FAILOVER_DELAY=3secondsFAILOVER_RETRIES=60retriesSESSION_STATE_CONSISTENCY=DYNAMICCOMMIT_OUTCOME=TRUEConfiguration
ConfigureJDBCReplayDriverCoGRANT[KEEPDATETIME|KEEPSYSGUID]..[to
USER]REVOKE[KEEPDATETIME|KEEPSYSGUID][from
USER]GRANTKEEPSEQUENCE..[to
USER]on[sequenceobject];REVOKEKEEPSEQUENCE[from
USER]on[sequenceobject];Ifowned,ALTERSEQUENCE..[sequenceobject][KEEP|NOKEEP];CREATESEQUENCE..[sequenceobject][KEEP|NOKEEP];MutablesandGrantPrivileges
GRANT[KEEPDATETIME|KEEPSMaximumApplicationAvailabilitywithOracledatabase12c
HangErrors&ConnectionHandlingOutcomeofIn-FlightWorkResubmissionofIn-FlightWorkMaximumApplicationAvailabiliOracleDatabase12c最大化应用程序的可用性课件OracleDatabase12c最大化应用程序的可用性课件OracleDatabase12c最大化应用程序的可用性课件MaximumApplicationAvailabilitywithOracleDatabase12cKuassiMensah
DirectorProductManagementMaximumApplicationAvailabiliThefollowingisintendedtooutlineourgeneralproductdirection.Itisintendedforinformationpurposesonly,andmaynotbeincorporatedintoanycontract.Itisnotacommitmenttodeliveranymaterial,code,orfunctionality,andshouldnotberelieduponinmakingpurchasingdecisions.Thedevelopment,release,andtimingofanyfeaturesorfunctionalitydescribedforOracle’sproductsremainsatthesolediscretionofOracle.ThefollowingisintendedtooMyNextSessionOracleIn-DatabaseMapReduce:WhenHadoopMeetsExadata7/25/13,12:00–13:00,Room431MyNextSessionOracleIn-DatabProgramAgendaProblemstoSolveNewConceptsTransactionGuardApplicationContinuityApplicationDesignConsiderationsProgramAgendaProblemstoSolvProblemstoSolveUponDatabaseOutageFourProblemsConfrontApplicationsHangErrorsOutcomeofIn-FlightWorkResubmissionofIn-FlightWorkProblemstoSolveUponDatabaseHang->FastApplicationNotification(FAN)
ErrorsHandling?Notformalized
In-FlightWork?Lost!ResubmissionofIn-FlightWork?N/A!CurrentSituationHangCurrentSituationProgramAgendaProblemstoSolveNewConceptsTransactionGuardApplicationContinuityApplicationDesignConsiderationsProgramAgendaProblemstoSolvRecoverableErrorFormalizedOracleException.IsRecoverablepropertyApplicationsNolongerneedtomaintainownlistoferrorcodes
(e.g.,ora-1033,ora-1034,ora-xxx)
JDBCthrows
SQLRecoverableException
RecoverableErrorFormalizedDatabaseRequest
UnitofWorkPoolDataSourcepds=GetPoolDataSource();Connectionconn=getConnection(pds);PreparedStatementpstmt=……SQL,PL/SQL,localcalls,RPC …mit();conn.close();RequestBeginsRequestBody
UsuallyendswithCOMMITRequestEndsDatabaseRequest
UnitofWorkProgramAgendaProblemstoSolveNewConceptsTransactionGuardApplicationContinuityApplicationDesignConsiderationsProgramAgendaProblemstoSolvTransactionGuardToolthatsupportsknownoutcomeforeverytransactionWithoutTransactionGuard,retrycancauselogicalcorruptionUsedbyApplicationContinuityCanbeusedindependentlyofApplicationContinuity4.EnforceOutcomeWorkRequest2.DBCalls12cORACLEDatabase3.Errors4.ReliableCommitOutcomeTransactionGuardToolthatsupTransactionGuard–TypicalUsageUpondatabaseinstancecrashFANabortsdeadsessionApplicationgetsanerrorPoolremovesorphanconnectionfrompoolIf“recoverableerror”thenGetlastLTXIDfromdeadsessionObtainnewdatabasesessionGettransactionstatusTransactionGuard–TypicalUsTransactionGuardInActiongetConnection()Txn.Commit();getLastLTXID<newsession>Commitoutcome?COMMIT/ROLLBACKstarttransactionassignLTXIDCOMMIT?Return&PreserveCOMMITOUTCOMEClient/Mid-tierDatabaseTimeRecoverableErrorCOMMITGetLogicalTXIDSQL,PL/SQL,RPCResultsTGinActionTransactionGuardInActiongetOnServiceCOMMIT_OUTCOMEValues–TRUEandFALSEDefault–FALSEAppliestonewsessionsRETENTION_TIMEOUTUnits–secondsDefault–24hours(86400)Maximumvalue–30days(2592000)TransactionGuard
ConfigurationOnServiceTransactionGuard
TransactionGuardinOracledatabase12cJDBC-thin,ODP.NET,OCI,OCCICommitModels
LocalTXNAuto-commit,CommitonSuccessCommitembeddedinPL/SQLDDL,DCL,ParallelDDLRemote,DistributedExclusionsXAR/WDBLinksfromActiveDataGuardorReadOnlyTransactionGuardinOracledaProgramAgendaProblemstoSolveNewConceptsTransactionGuardApplicationContinuityDesignConsiderationsProgramAgendaProblemstoSolvApplicationContinuityMaskDatabaseOutageWhenSuccessfulReplaysin-flightworkonrecoverableerrorsMasksmanyhardware,software,network,storageerrorsandoutageswhensuccessfulImprovesenduserexperience5.ResponseWorkRequest2.DBCalls12cORACLEDatabase4.Replay3.ErrorsApplicationContinuityMaskDatPhasesinApplicationContinuity1-Capture2-Reconnect3-ReplayDemarcatesdatabaserequestHoldsoriginalcallswithbinds&validationManagesqueuesChecksrequesthasreplayenabledHandlestimeoutsCreatesanewconnectionValidatestargetdatabaseUsesTransactionGuardtoenforcelastcommitReplaysheldcallsContinuesreplay,ifuservisibleresultsmatch,basedonvalidationsContinuesrequestPhasesinApplicationContinuiApplicationContinuityInAction
Call1
Application
Proxy1
Proxy2RACDatabaseInstance1Instance2Instance3
Call2
Connection
ReplayContextOracleJDBCDriverApplicationContinuityInActiDEMODEMOSolutionCoverage
ApplicationContinuityforJavaClient
JDBC-ThindriverUCP,WebLogicServerDatabaseSQL,PL/SQL,RPCSelect,ALTERSESSION,DML,DDL,COMMIT/ROLLBACK/SAVEPOINTTransactionmodels:Local,Parallel,Remote,DistributedMutablefunctionsupportHardwareaccelerationoncurrentIntel&SPARCchipsSolutionCoverage
ApplicationExclusions
GlobalRequestTargetDatabaseDonotusedefaultdatabaseserviceExcludesXAForJava,deprecatedconcreteclassesRestrictedcallsAlterSystemAlterDatabaseNotsupportedforActiveDataGuardwithread/writedatabaselinksDoesnotsupport:LogicalStandbyGoldenGateExclusions
GlobalRequestTargRestrictions
WhenDoesReplayNotOccur?
NormalRuntimeReconnectReplayAnycallinsamerequestaftersuccessfulcommitindynamicmode
(default)arestrictedcalldisableReplayAPIErrorisnotrecoverableReconnectionfailureReplayinitiationtimeoutMaxconnectionretriesMaxretriesperincidentTargetdatabasenotvalidforreplayLastcallcommitted
indynamicmodeValidationdetectsdifferentresultsRestrictions
WhenDoesReplayProgramAgendaProblemstoSolveNewConceptsTransactionGuardApplicationContinuityApplicationDesignConsiderationsProgramAgendaProblemstoSolvApplicationAssessment
DecideWhattodoRequestBoundariesMarkRequestBoundaries,ifyouarenotusingOraclePoolsJDBCConcreteClassesReplacedeprecatedconcreteclasseswithJavainterfacesSideEffectsUsedisableAPIifadatabaserequesthasanexternalcallthatshouldnotbereplayedCallbacksEnsureacallbackisregisteredifstatechange
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