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UsingDataGuardBroker
andEnterpriseManagerObjectivesAftercompletingthislesson,youshouldbeabletodothefollowing:DescribetheDataGuardbrokerarchitectureDescribetheDataGuardbrokercomponentsExplainthebenefitsoftheDataGuardbrokerExplainDataGuardbrokerconfigurationsUseEnterpriseManagertomanageyourDataGuardconfigurationInvokeDGMGRLtomanageyourDataGuardconfigurationFeaturesofDataGuardBrokerTheDataGuardbrokerisadistributedmanagementframework.Thebrokerautomatesandcentralizesthecreation,maintenance,andmonitoringofDataGuardconfigurations.Withthebroker,youcanperformallmanagementoperationslocallyorremotelythrougheasy-to-useinterfaces:OracleEnterpriseManager10gGridControlAcommand-lineinterface:DGMGRLDataGuardBroker:ComponentsClient-side:OracleEnterpriseManager10gGridControlDGMGRL(command-lineinterface)Server-side:DataGuardmonitorDMONprocessConfigurationfilesDataGuardBroker:ConfigurationsThemostcommonconfigurationisaprimarydatabaseatonelocationandastandbydatabaseatanotherlocation.ChicagoPrimarysiteBostonStandbysiteOracleNetDataGuardBroker:ManagementModelDataGuardBrokerConfigurationPrimarydatabaseBroker-controlleddatabasesStandbydatabaseStandbydatabaseStandbydatabaseStandbydatabaseStandbydatabaseStandbydatabaseStandbydatabaseStandbydatabaseStandbydatabaseInstancesInstancesPrimarysiteStandbysite9Standbysite2DataGuardBroker:ArchitectureGraphicaluserinterface
or
command-lineinterfaceDMONArchived
redologsOnline
redologsStandbysite1Oracle
NetStandby
redologsArchived
redologsLog
apply
servicesDataGuardConfigurationLog
transport
servicesPrimarydatabaseDMONConfigurationfilesConfigurationfilesStandbydatabaseLifeCycleofaBrokerConfigurationCreateconfigurationEnableconfigurationMakestateorrolechangesUpdatedatabasepropertiesMonitorandtuneconfigurationDataGuardBroker:RequirementsEnterpriseEditionofOracleDatabase10gSingle-instanceormulti-instanceenvironmentCOMPATIBLEmustbesetto.0orhigherforprimaryandstandbydatabases.OracleNetnetworkfilesmustbeconfiguredfordatabasesthatyouaddtotheconfiguration.LOCAL_LISTENERoneachinstancemustresolvetoanaddressthatisreachablebyallmembers.GLOBAL_DBNAMEattributemustbesettoaconcatenationof:db_unique_name_DGMGRL.db_domainDataGuardBroker:RequirementsDG_BROKER_START=TRUETheprimarydatabasemustbeinARCHIVELOGmode.AlldatabasesmustbeinMOUNTorOPENmode.ConfigureDG_BROKER_CONFIG_FILEnforanyRACdatabases.START_OPTIONSforanyRACdatabasesmustbesettoMOUNTintheOracleClusterRepository(OCR).DataGuardBrokerandtheSPFILEYoumustuseaserverparameterfile(SPFILE)forinitializationparameters.UsingtheSPFILEenablestheDataGuardbrokertokeepitsconfigurationfileandthedatabaseSPFILEconsistent.Ifyouusethebroker,useEnterpriseManagerorDGMGRLtoupdatedatabaseparametervalues.DataGuardMonitor:DMONProcessServer-sidebackgroundprocessPartofeachdatabaseinstanceintheconfigurationCreatedwhenyoustartthebrokerPerformsrequestedfunctionsandmonitorstheresourceCommunicateswithotherDMONprocessesintheconfigurationUpdatestheconfigurationfileDataGuardMonitor:ConfigurationFileAutomaticallycreatedandnamedusingadefaultpathnameandfilenamewhenthebrokerisstartedOverridedefaultpathnameandfilenamebysettingDG_BROKER_CONFIG_FILEn.TwofilesateachmanagedsiteManagedautomaticallybytheDMONprocessDefaultnamesaredr1<db_unique_name>.datanddr2<db_unique_name>.dat.Defaultlocationsareoperatingsystemspecific:DefaultlocationforUNIXandLinux:ORACLE_HOME/dbs
DefaultlocationforWindows:ORACLE_HOME\databaseBenefitsofUsingtheDataGuardBrokerEnhancesthehigh-availability,dataprotection,anddisasterprotectioncapabilitiesinherentinOracleDataGuardbyautomatingbothconfigurationandmonitoringtasksStreamlinestheprocessforanyoneofthestandbydatabasestoreplacetheprimarydatabaseandtakeoverproductionprocessingHelpsyoulogicallydefineandcreateaDataGuardconfigurationconsistingofaprimarydatabaseandastandbydatabaseEnableseasyconfigurationofadditionalstandbydatabasesBenefitsofUsingtheDataGuardBrokerProvidessimplified,centralized,andextendedmanagementAutomatesswitchoverandfailovertoaspecifiedstandbydatabaseinthebrokerconfigurationAutomaticallycommunicatesbetweenthedatabasesinaDataGuardconfigurationusingOracleNetServicesProvidesbuilt-invalidationthatmonitorsthehealthofallthedatabasesintheconfigurationDataGuardBrokerInterfacesOracleEnterpriseManager10gGridControl:ContainswizardstosimplifycreatingandmanagingstandbydatabasesCommand-lineinterface(CLI):StartedbyenteringDGMGRLatthecommandpromptwheretheOracleserverisinstalledEnablesyoutocontrolandmonitoraDataGuardconfigurationfromtheCLIpromptorinscriptsUsingOracleEnterpriseManager10g
GridControlClick“SetupandManage”toaccesstheDataGuardpages.DataGuardOverviewPageEnterpriseManagerMetricsandAlertsMetrics:UnitsofmeasurementusedtoassessthehealthofyoursystemThresholds:BoundaryvaluesagainstwhichmonitoredmetricvaluesarecomparedAlert:GeneratedwhenathresholdisreachedUsingDataGuardMetricsEnterpriseManagerincludesthefollowingDataGuardmetrics:DataGuardFast-StartFailoverDataGuardFast-StartFailover ObserverDataGuardPerformanceDataGuardStatusManagingDataGuardMetricsConfigurenotificationmethods.ViewtheAllMetricspage.SetorchangeDataGuardmetricthresholds.Viewtriggeredmetrics.BenefitsofUsingEnterpriseManagerEnablesyoutomanageyourconfigurationusingafamiliarinterfaceandevent-managementsystemAutomatesandsimplifiesthecomplexoperationsofcreatingandmanagingstandbydatabasesthroughtheuseofwizardsPerformsallOracleNetServicesconfigurationchangesthatarenecessarytosupportredotransportservicesandlogapplyservicesProvidesaverifyoperationtoensurethatredotransportservicesandlogapplyservicesareconfiguredandfunctioningproperlyEnablesyoutoselectanewprimarydatabasefromasetofviablestandbyda
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