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OtherConsiderationsfor
OracleDataGuardObjectivesAftercompletingthislesson,youshouldbeabletodothefollowing:BackuptheprimarydatabasewithaphysicalstandbydatabaseBackupalogicalstandbydatabaseUseFlashbackDatabasefeaturesinaDataGuardconfigurationEncryptredoinformationConfigurecascadedredologdestinationsOffloadingBackupstoaPhysicalStandbyBackupsofdatafilesandarchivedredologsarefullyinterchangeable.Controlfilebackupsarenotinterchangeable.Primaryandstandbydatabasesmustusethesamerecoverycatalog.Itisnotnecessarytoregisterthestandbydatabase.UsingRMANtoBackUp
aPhysicalStandbyDatabaseInvokeRMAN.Allocatechannelsifneeded.IssuetheBACKUPcommand.UsetheLISTcommandtoverifythebackup.RestrictionsandUsageNotesThedatabaseyouarebackingupmustbeaphysicalstandbydatabase.Youmustbeconnectedtotherecoverycatalogwhenbackingup.Youcannotbackupthestandbycontrolfile.YoumustconnecttothephysicalstandbydatabasewiththeTARGETkeyword.BackupandRecoveryofa
LogicalStandbyDatabaseBackupconsiderations:Usethesamebackupmethodthatyouuseforyourprimarydatabase.Filesarenotinterchangeablewiththeprimarydatabase.Recoveryconsiderations:CanrecoverlikeanyotherdatabaseforlossofindividualfilesNeedtore-createifyouloseentiredatabaseMustuseabinarycopyofcontrolfileforcontrol-filerecoveryFlashbackAcrossDatabaseChangesFlashbackDatabaserestoresthedatabasetoapoint-in-timebeforethefollowingglobaldatabasechanges:DatabaseRESETLOGSoperationDatabaseswitchoverorfailovertoaphysicalorlogicalstandbydatabasePhysicalstandbydatabaseactivationUsingFlashbackDatabaseand
Real-TimeApplyRFSStandbyredologMRPARC0ArchivedredologsPrimarydatabaseStandbydatabaseUsingFlashbackDatabaseAfterRESETLOGSRedoRedoFlashbackPrimarydatabaseStandbydatabaseRESETLOGS
afterpoint-in-timerecoveryPrimarydatabaseStandbydatabaseEnablingRedoEncryptionPrimarydatabaseStandbydatabaseRedoinformationencryptedActivatingaPhysicalStandbyDatabaseforReportingPhysicalstandbydatabaseFlashbackRedoapplyRedostreamRedotransportGuaranteedrestorepointPrimarydatabaseActivateforreportingActivatingaPhysicalStandbyDatabaseforReportingOnthephysicalstandbydatabase,performthefollowingsteps:Specifyinitializationparameterstodefinetheflashrecoveryareaifnotalreadyconfigured.CancelRedoApply.Createaguaranteedrestorepoint.Ontheprimarydatabase,performthefollowingstepstoensurethatthephysicalstandbydatabasecanberevertedtotherestorepoint:Archivethecurrentlog.Deferthelogarchivedestinationforthephysicalstandbydatabase.ActivatingaPhysicalStandbyDatabaseforReportingActivatethephysicalstandbydatabaseandsetprotectionmodetomaximumperformance.Performreportingortestingontheactivateddatabase.Reverttheactivateddatabasetoaphysicalstandbydatabase:Flashbacktotherestorepoint.Convertitbackintoaphysicalstandbydatabase.Ontheprimarydatabase,reenablearchivingtothephysicalstandbydatabasedestination.AllowDataGuardtoautomaticallyresynchronizethephysicalstandbydatabaseoruseRMANincrementalbackupsfromtheprimarydatabasetoresynchronizethephysicalstandbydatabase.CascadedRedoLogDestinationsPrimarydatabaseStandbydatabaseStandbydatabaseRedoRedoConfiguringCascadedRedoLogDestinations:PhysicalStandbyOntheprimarydatabase,usetheLGWRtransport.Onthereceivingstandbydatabase:Configurestandbyredologs.ConfigureLOG_ARCHIVE_DEST_ntosendredotothenextstandby.PhysicalstandbyPrimarydatabasePhysicalor
logicalstandbyRoleTransitionswith
CascadedRedoLogDestinationsStandbydatabasesthatreceiveredodatafromaphysicalstandbydatabase:Nochange:Switchoverandfailoverareexactlythesame.MaytakelongerStandbydatabasesthatreceiveredodatafromalogicalstandbydatabasecannotparticipateinaswitchoverinvolvingtheprimarydatabase.SummaryInthislesson,youshouldhavelearnedhowto:Back
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