oracle data guard 12.2 - 18c - doag.org · • in oracle database 12c release 2, a storage failure...

OracleDataGuard12.2-18c

UweKirchhoffTechnicalArchitectACSGlobalDelivery

SafeHarborStatementThefollowingisintendedtooutlineourgeneralproductdirection.Itisintendedforinformationpurposesonly,andmaynotbeincorporatedintoanycontract.Itisnotacommitmenttodeliveranymaterial,code,orfunctionality,andshouldnotberelieduponinmakingpurchasingdecisions.Thedevelopment,release,andtimingofanyfeaturesorfunctionalitydescribedforOracle’sproductsremainsatthesolediscretionofOracle.

OracleDataGuardProposedEnhancements

Manageability

Protection

Performance

PlannedMaintenance

ClientFailover

ManageabilityEnhancements12candBeyond

OracleDataGuard-Manageability

• CreateDataGuardStandbyswithDatabaseCreationAssistant(DBCA)• RMANDUPLICATEforFarSync•  EnterpriseManagersupportforFarSynccreation•  EMCLIstandbydatabasecreation

StandbyCreation

DBCAStandbyCreation

• AttheStandbyserverinstalltheOracleSoftwareandstartalistener•  Executeasinglelinecommand

• ConfigureyournetworkTNSNAMESforDataGuard• BuildyourBrokerconfiguration.– OrjustaddthisnewstandbytoyourexistingBrokerconfiguration

Simpleandscriptable!

dbca -silent -createDuplicateDB –gdbName PROD.de.oracle.com –sid STBY -sysPassword oracle -primaryDBConnectionString linbar01:1521/PROD.de.oracle.com -createAsStandby –dbUniquename SPROD -customScripts $ORACLE_HOME/PostCR.sql

RMANandFarSync

• RMANwillbeabletocreateaFARSYNCInstanceusingDUPLICATE–  duplicate target database for farsync from active database; –  duplicate target database for farsync backup …

•  Samebasicsetupasthestandbyactiveduplicateprocessthen…

connect target sys@PROD; connect auxiliary sys@PROD1FS; run {allocate channel prmy1 type disk; allocate auxiliary channel stby1 type disk; duplicate target database for farsync from active database spfile parameter_value_convert (’PROD',’SPROD') set 'db_unique_name'=’SPROD';}

EnterpriseManagerCloudControl

•  YouwillalsobeabletocreateFarSyncInstancesusinganew,butfamiliarEMCCcreationWizard

FarSyncCreationandManagement

FarSyncCreationandManagementEnterpriseManagerCloudControl

EnterpriseManagerCloudControl

•  EnterpriseManagerhashadaStandbyCreationWizardformanyversions•  ItalsohasacommandlineinterfacecalledEMCLI– Today(<12.2)youcannotscriptstandbycreationthroughit.– Butnotforlong!

– NoticehowthetargetcanbeaRACorSingleInstancedatabase– RMANduplicatefromactivedatabaseisalsothedefault

Commandlinestandbycreation

emcli create_standby -source_db_target_name=“PROD” -source_db_target_type=“rac_database” -dest_oracle_sid=“PROD1_1” -spname=“PROD1” -use_broker

• RESTfulServicesInterface– Creating,MonitoringandManagingaDataGuardBrokerConfiguration

• OracleDataGuardforDataWarehouses-NoLoggingsupport•  SubsetStandbys• AutomaticallySynchronizePasswordFiles•  TDETablespaceOfflineConversion

EaseofUse

DataGuardandNoForceLogging

• No-Loggingoperationsonlygenerateenoughredototellthestandbythatsomeblocksarenowunrecoverable.– Repairingthemmeantrestoringthecompleteaffecteddatafiles.

• No-LoggingblockswillbetrackedbythePrimarydatabase•  StandbyscanthenbeeasilyrepairedusingRMAN– Validationandrepaironlyofblocksonstandbythatwereinvalidatedbynon-loggedoperations(suchasdirectloads)ontheprimary

– ThiswillquerythePrimaryforblocklocationsthatcontainnon-loggedblocksandrepairthestandbydatabase.

rman validate/recover .. nonlogged block

RemovingtheheadacheofPasswordfilemanagement

•  Today(<12.2)whenyouchangethepasswordofanyelevatedprivilegeuser– YoumustcopythepasswordfiletoallothernodesofthePrimaryANDallstandbys– Madealittlesimplerin12.1.0.1byasharedpasswordfileforRAC

•  InOracleDatabase12cRelease2– Changingelevatedprivilegedpasswordsontheprimaryautomaticallyupdatesallthestandbys’passwordfiles.

– Noneedtomanuallycopypasswordfiles!

• NewDGredoauthenticationprotocolthatusesSSLcertificatefor‘redo_transport_user’

Password,Password,who’sgottherightpassword?

TDETablespaceConversion

• RequiresanExportandImporttoencrypt• Cannotbedoneonlinesodataisunavailableduringtheprocess• OutageforthedatacanbemitigatedbyusingaTransientLogicalStandby– ConvertaPhysicalStandbytoaTransientLogicalStandby•  Exportthedata,Createtheencryptedtablespace,Importthedataatthetransientlogicalstandby

– Switchover– Athttp://www.oracle.com/goto/maaseethesetwopapers•  ConvertingtoTransparentDataEncryptionUsingActiveDataGuard12c(DBMS_ROLLING)•  ConvertingtoTransparentDataEncryptionUsingDataGuardTransientLogicalStandbywithOracleDatabase11g

TDETablespaceConversion

• Offlinedatafilemethodstillavailable– CompletewithPhysicalStandbymethod

• AnewSQLcommandwillarriveonthescene!

•  Encryptsalldatafilesinthetablespaceonline.– Primaryonly&Requiresauxiliarydiskspace

• CanalsobedoneOFFLINEforbetterperformance– NoExtrastorage,butrequiresdataoutageonPrimary.– OfflinecanbedoneonaPhysicalStandbyfirstaswiththepreviousexample

(>=12.2)

alter tablespace users encryption encrypt

• DGMGRLCommandImprovements• BrokerConfiguration-WideServiceName•  SimplifiedObserverManagementformultipleFast-StartFailoverconfigurations

BrokerGeneralEnhancements

NewDGMGRLcommands

•  EnhancedScriptingandExecution– Scriptexecutionvia‘@’– RepeatpreviousDGMGRLcommandwith‘/’– Executeoperatingsystemcommandwith‘HOST’or‘!’– Storeoutputinafilewith‘SPOOL’– Displaytimestampinpromptvia‘SETTIMEON/OFF’

Configuration-WideServiceName

• Providesasingleautomaticallystartedservicetoconnecttoanydatabase,PrimaryorStandby,inaDataGuardBrokerconfiguration.– DefaultstoPrimaryDBUniquenamewith‘_CFG’appended.– RequiredtoimplementtheSimplifiedObservermanagement(Nextslide)

• Canbesetbytheuserwith:

• Andseenwith:

edit configuration set property ConfigurationWideServiceName = ‘PROD_CFG’;

show configuration verbose ConfigurationWideServiceName; ConfigurationWideServiceName = ’PROD_CFG'

SimplifiedObserverManagement

•  Today(<12.2)whenyouhavemultipleBrokerconfigurationsusingFast-StartFailoveryoumustmanagetheObserversseparatelyeveniftheyallrunonthesame‘Observer’system.•  TheObserveralsorunsintheforeground•  Let’sfixthatlastonefirst

•  Thatsettlesthat• ButwhataboutmultipleFast-StartFailoverconfigurations?

start observer PRODObserver logfile is ‘/tmp/PRODObserver’ in background connect identifier is PROD;

• CreateanObserverConfigurationfile(herewehave4Observers,2groups)

•  TheCONNECT_IDmustpointtothePrimaryandallpotentialFSFOTargets

OneCommandtoRunandManageMultipleObservers

BROKER_CONFIGS = ( (CONFIG = (NAME=SALES) (CONNECT_ID=SALES_P)(FILES=/home)) (CONFIG = (NAME=HR) (CONNECT_ID=HR_P)(FILES=/home)) (CONFIG = (NAME=CUSTOMER) (CONNECT_ID=CUSTOMER_P)(FILES=/home)) (CONFIG = (NAME=ORDERS) (CONNECT_ID=ORDERS_P)(FILES=/home))) CONFIG_GROUPS = ( (GROUP =(NAME=GRP_A ) (CONFIG_LIST = (NAME=SALES)(NAME=ORDERS))) (GROUP= (NAME=GRP_B) (CONFIG_LIST = (NAME=HR)(NAME=CUSTOMER))))

•  SetthePropertytopointtoyourfileontheObserversystem

• Noticethatthereisnoneedtoconnecttoanydatabasetosetthisup

Oracle12c > dgmgrl DGMGRL for Linux: Release 12.2.0.0.0 Copyright (c) 1982, 2015, Oracle and/or its affiliates. All rights reserved. Welcome to DGMGRL, type "help" for information. DGMGRL> set observerconfigfile='/home/myobservers.ora'; DGMGRL> show observerconfigfile; ObserverConfigFile=/home/myobservers.ora

• OncethefileissetupinstructtheBrokertoruntheObservergroups

•  Therearenopasswordsintheconfigurationfile•  YoumustusetheWalletforauthenticationonalldatabasesinvolved.

DGMGRL> start observing grp_a ; ObserverConfigFile=/home/myobservers.ora Observer configuration file parsing succeeded Submitted command "START OBSERVER" using connect identifier “SALES_P" Submitted command "START OBSERVER" using connect identifier “HR_P“ Check superobserver.log and individual observer logs

ProtectionEnhancements12candBeyond

OracleDataGuard-Protection

•  EnhancedAutomaticBlockRecovery•  Zero-datalossFast-startFailoveruponstoragefailureeveninasyncmode– Ifinstancefails,shipsallredodataaccumulatedinlogbuffertostandby

• OracleDataGuardDatabaseCompare•  EnhancedAlternateDestinations• BrokerProtectionEnhancements• DisasterRecoveryintheCloud

EnhancedProtection

EnhancedAutomaticBlockRecovery

• ActiveDataGuardAutomaticBlockRepairintroducedin11gRelease2

• Blockslikefileheadersetcwerenotrepaired.•  InOracleDatabase12cRelease2thetypesofcorruptedblocksthatcanberepairedincreases!

ActiveStandbyDatabase

PrimaryDatabase

Read/WriteWorkload

Continuousredoshipping,validation&apply

Real-timeReporting

Zero-DataLoss(ZDL)Fast-StartFailover

•  Today,ZDLFast-StartFailoversareonlypossibleinSynchronousconfigurationsrunninginMaximumAvailability– Manytimesthough,failuresarestoragerelatedandnotcompletesystemfailures

•  InOracleDatabase12cRelease2,astoragefailureattheprimarydatabasewillbehandledbytheOracleDataGuardAsynchronousprocess.– Iftheinstancefails,itwillshipallredodataaccumulatedinlogbuffertostandby– ThiswillallowFast-StartFailovertoperformaZeroDataLossfailover•  EventhoughtheconfigurationwasinMaximumPerformance

– SimilartoanAutomaticIn-Memory‘ALTERDATABASEFLUSHREDO;’atfailuretime

Enhancedforasynchronousconfigurations

OracleDataGuardDatabaseCompare

• Highspeeddatabasecomparebetweenprimaryandstandby– DetectslatentcorruptionsonblocksthathavenotbeentouchedbyOracle•  Usefulindetectinglatentcorruptions,lostwrites•  Fastcompareatphysicallevel,accountsforblocksbeingmodified•  Network&computeefficiency– Send&compareblocksin“batches”– Optimizesforblockswhereversionsarethesame–  Ignoresemptyblocks

DGMGRL> validate database PROD1 datafile 10 output=checkPROD1; Operation requires a connection to database ”PROD1" Connecting ... Output files are created in /…/PROD1/trace on host “GRONAU1"

OracleDataGuardDatabaseCompareSummary: *************************************************************************** ID: Block Type Id TOTAL: Total number of blocks found DIFFV: Number of block pairs with different version LWLOC: Lost Writes at Local LWRMT: Lost Writes at Remote SAMEV: Number of block pairs with same version SAMEV&C: Number of block pairs with same version and checksum DIFFPAIR: Number of block pairs with same version but different contents ENCERR: Undecided blocks related to encryption/decrytion error. e.g. Wallet is not open. SKIPPED: Skipped blocks due to data corruption, etc ID TOTAL DIFFV LWLOC LWRMT SAMEV SAMEV&C DIFFPAIR ENCERR SKIPPED 29 0000001 0000000 0000000 0000000 0000001 0000001 0000000 0000000 0000000 30 0000125 0000000 0000000 0000000 0000125 0000125 0000000 0000000 0000000 58 0000512 0000512 0000000 0000000 0000000 0000000 0000000 0000000 0000000

EnhancedAlternateDestinations• Alternatedestinationsgotmuchbetterin12.1– Butfailbacktothefirstdestinationhappenedwhetherornotyouwantedit– Andyoulostfailbackifyouconfiguredmorethanonealternate.

•  Soin12.2wethrewawaytheALTERNATEattributeofredotransport– Replacingitwith2newattributes-GROUPandPRIORITY•  GROUPsaysweareallpotentialalternatesofeachotherinthesamegroup•  PRIORITYtellsDataGuardwhentofailbacktotheoriginaltargetbetweengroups

• Didyougetallthat?– Ididn’tthinkso,thisismygiveyouaheadachefeature.– Let’slookatanexample

ImprovedAlternateDestinations• Ourconfiguration– WehaveaPrimarywithtwoStandbys(TS1andTS2)•  Theycouldbeonelocalandoneremoteorbothremoteorbothlocal– ButwithFarSyncweshiponcefromthePrimaryandgetZDLatbothifnecessary

– Wealsohave2FarSyncinstancesthatcanservicethetwoStandbys(FS1,FS2)•  FarSync1&2areofequalconfigurationandbothlocal(withinSYNClatency)– SowecanloseoneandtheotherwilltakeoverandmaintainMaximumAvailability

•  ButifbothFarSyncInstancesaredownwestillwantredotobeshippedtoTS1&TS2•  Sowesetour4“LOG_ARCHIVE_DEST_n”parametersasfollows(allvalidforthePrimaryrole/logfile)

• Allclear?

2:SERVICE=FS1 SYNC GROUP=1 PRIORITY=1 3:SERVICE=FS2 SYNC GROUP=1 PRIORITY=1 4:SERVICE=TS1 ASYNC GROUP=1 PRIORITY=8 5:SERVICE=TS2 ASYNC GROUP=1 PRIORITY=8

ImprovedAlternateDestinations• OK,someEnglishtogowiththeparameters,theseareallthesamegroup

• ButthePrioritysays– SendRedotoFS1first,itforwardstheredotoTS1&TS2.– IfFS1failsstartsendingtoFS2whoforwardstheredotoTS1&TS2•  IfFS1comesbackdonothing,staywithFS2•  HoweverifFS2failsandFS1isback,reverttoFS1

– IfbothFS1andFS2failthensenddirectlytoTS1andTS2.•  SincetheyareconfiguredasASYNCtheProtectionLeveldropstoRESYNCHRONIZATION•  AfterthatifeitherFS1orFS2becomeavailablerevertbacktothem– ProtectionLevelgoesbacktoMaximumAvailability

2:SERVICE=FS1 SYNC GROUP=1 PRIORITY=1 3:SERVICE=FS2 SYNC GROUP=1 PRIORITY=1 4:SERVICE=TS1 ASYNC GROUP=1 PRIORITY=8 5:SERVICE=TS2 ASYNC GROUP=1 PRIORITY=8

ImprovedAlternateDestinations

• NormalSteadyState

Howaboutapicture?

PrimaryTS1FS1

SYNCASYNC

•  FarSyncFS1Fails(StayinPriority1)

Howaboutapicture?

PrimaryTS1FS1

SYNCASYNC

•  FarSyncFS1comesback(StayinPriority1,Nofailback)

Howaboutapicture?

PrimaryTS1FS1

SYNCASYNC

•  FarSyncFS2FailsandFS1isstillnotavailable(MovetoPriority8)

Howaboutapicture?

PrimaryTS1FS1

SYNCASYNC

•  FarSyncFS1comesback(MovebacktoPriority1)

Howaboutapicture?

PrimaryTS1FS1

SYNCASYNC

OracleDataGuard-Protection

• BlockComparisonToolSupportinDGMGRL– Shownintheearlierexample

• MultipleAutomaticFailoverTargets• MultipleObservers•  Fast-StartFailoverinMaximumProtectionMode•  SupportforEnhancedAlternateDestination•  SupportforTransportDestinationsofDifferentEndianess– Cross-endianDataGuard:AIXtoRecoveryAppliance

BrokerProtectionImprovements

PerformanceEnhancements12candBeyond

OracleDataGuard-Performance

• Multi-InstanceRedoApply– OracleDataGuardBrokerSupport• DatabaseIn-MemoryonanOracleActiveDataGuardStandbyDatabase• ActiveDataGuardsupportforDiagnosticPackfeatures• ActiveDataGuardSupportforSQLTuningAdvisor

PerformanceandTuningEnhancements

Single-InstanceRedoApply

MRPProcesses

StandbyInstance1

RFSProcess

CoordinatorProcess

MRPProcesses

StandbyInstance2

RFSProcess

CoordinatorProcess

MRPProcesses

StandbyInstance3

RFSProcess

PrimaryInstance1

ASYNC/SYNCProcess

PrimaryInstance2

ASYNC/SYNCProcess

PrimaryInstance3

ASYNC/SYNCProcess

Thread1Redo

Thread2Redo

Thread3Redo

Multi-InstanceRedoApply

CoordinatorProcess

MRPProcesses

StandbyInstance1

RFSProcess

CoordinatorProcess

MRPProcesses

StandbyInstance2

RFSProcess

CoordinatorProcess

MRPProcesses

StandbyInstance3

RFSProcess

PrimaryInstance1

ASYNC/SYNCProcess

PrimaryInstance2

ASYNC/SYNCProcess

PrimaryInstance3

ASYNC/SYNCProcess

Thread1Redo

Thread2Redo

Thread3Redo

Multi-InstanceRedoApply

• Parallel,multi-instancerecovery:standbywillkeepup– Standbyrecovery-utilizesCPUandIOacrossallnodesofRACstandby

– Haveseen3500MB+/secapplyrateonan8nodeRAC

• Multi-InstanceApplyrunsonallMOUNTEDinstancesorallOPENInstances•  ExposedintheBrokerwiththe‘ApplyInstances’propertyonastandbydatabase

recover managed standby database disconnect using instances 4;

DatabaseIn-MemoryandActiveDataGuard

•  In-memoryDBonActiveDataGuard– CreateIMCtablesandcolumnsforanalyticsonActiveDataGuard– Canpopulatewithdifferentdatathanproductiondatabase• Offloadevenmoretoyourstandby!

MonthIn-Memory

YearIn-Memory

StandbyPrimary

DiagnosticsandTuningforActiveDataGuard

•  SupportforDiagnosticPack(AWR)

•  SupportforTuningPackfeaturesandSQLPlanAnalyzer

AWRSupportforRemoteSnapshots

•  InOracleDatabase12cRelease2,theAWRframeworkisenhancedtosupportcaptureofremotesnapshotsfromanygenericdatabaseincludingActiveDataGuard(ADG)databases.– Atargetcatalogdatabasecollectssnapshotsfromtheremotedatabases(sources)– Snapshotscanbecollectedautomaticallyormanually– AWRtablesonthecatalogdatabaseaccumulatesnapshotdatafromallsourcesviadatabaselinks

– SourcedatabasesmustberegisteredonthecatalogvianewDBMS_WORKLOAD_REPOSITORY.REGISTER_REMOTE_DATABASEAPI

OnanActiveDataGuardStandby

SQLTuningAdvisorSupportforActiveDataGuard

• AllSQLTuningAdvisortasksissuedatthestandby– Createtuningtask,executetuningtaskandimplementSQLTuningAdvisorrecommendations

– Testexecution(heavylifting)happensonstandby•  Onlyminimalwriterelatedactivityonprimary

• Requireddatafetchedfromprimaryoveradatabaselinkfromstandby•  Taskdetailsandtuningresultsarestoredatprimaryandtheessentialdatarequiredtoconstructthereportisaccessedremotelyfromprimary•  Thereportisconstructedlocallyatthestandby,withnoCPUoverheadinprimary

Featurelist•  Fasterqueryresponsewithfasterredoapply– Multi-InstanceRedoApplyonADGnowsupportsIn-MemoryColumnar&Block-changetracking

•  ExtendADGenvironmentsforDataWarehousing– ADGsupportforNologgingworkloads•  FasterapplicationresponseafterADGroletransition– PreserveBufferCacheonADGafterroletransition• ProtectPrimarydatabasefromlostwritestoragefailures– NewLostwritedetectioncapabilityusingshadowtablespacesatPrimary

Multi-InstanceRedoApplyenhancements• Multi-InstanceRedoApplyallowsallstandbynodestoparticipateinrecovery•  In-memoryDB(IMC)onActiveDataGuardallows:*–  CreationofIMCtablesandcolumnsforanalyticsonActiveDataGuard–  Populationwithdifferentdatathanproductiondatabase–  Offloadingevenmoretoyourstandby!

• Multi-InstanceRedoapplyalsoworkswithBCT*AvailableonlyonExadataandOracleCloudOfferings

MonthIn-Memory

YearIn-Memory

StandbyPrimary

DataGuardandNoForceLogging*

•  ExtendedtoprovidebettersupportinanActiveDataGuardenvironmentwithoutsignificantlyincreasingtheamountofredogenerated.•  Twonewmodesareaddedasalternativestotheexistingnologgingmode– StandbyNologgingforLoadPerformance•  Ensuresthatstandbyswillreceivethenonloggeddatachangeswiththeminimumimpacttothespeedofloadingattheprimary– Thestandbycantransientlyhavenonloggedblocks.Thesenonloggedblockswillbeautomaticallyresolvedbymanagedstandbyrecovery.

– StandbyNologgingforDataavailability•  Ensuresallstandbyshavethedatawhentheprimaryloadcommitsbutatthecostofthrottlingthespeedofloadingdataattheprimary– Thestandbyswillneverhaveanynonloggedblocks.

*AvailableonEngineeredSystemsandOracleCloudonly

CreatingGTTsonActiveDataGuard• CreatingGTTstodaywillfailwhenexecutedonActiveDataGuard•  In18.1.0.0CREATE GLOBAL TEMPORARY TABLEonActiveDataGuardwill:– CreatetheGTTonthePrimary– WaitfortheGTTtobereplicatedandappliedtotheActiveDataGuardstandby– Returncontroltotheuser

ExecutingDMLonActiveDataGuard

• DMLRe-directionautomaticallyperformedfromActiveDataGuardstandbytothePrimarywithoutcompromisingACID– Enabledbysettingparameter“_enable_proxy_adg_redirect=TRUE”andappropriateconnectivityparameters•  StandbyADGsessionwaitsforupdatestoshowuponADGviaredoapply•  DMLdatare-directedbyanADGsessionisonlyvisibletothatsessionbeforecommit•  DMLdatare-directedisvisibletoallsessionsafterADGsessioncommits

– RespectsACIDpropertiesofadatabaseforADGsession– Targetedfor“ReadMostlyOccasionalUpdates”applications

RestrictedsupportforDMLRe-direction

NewBrokerDGMGRLcommands•  EnhancedScriptingandExecution– SETECHO|DEBUGON|OFF– SHOWALL•  ShowscurrentDGMGRLsettings

NewBrokerVALIDATEcommands• VALIDATEDATABASESPFILE– ValidateparameterssettingsbetweenthePrimaryandaStandbydatabase.

• VALIDATENETWORKCONFIG– Validatethenetworksetupbetweenalldatabasesintheconfiguration• VALIDATESTATICCONNECTIDENTIFIER– VerifythestaticconnectidentifiersetupinNon-CRSdatabases

SafeHarborStatementTheprecedingisintendedtooutlineourgeneralproductdirection.Itisintendedforinformationpurposesonly,andmaynotbeincorporatedintoanycontract.Itisnotacommitmenttodeliveranymaterial,code,orfunctionality,andshouldnotberelieduponinmakingpurchasingdecisions.Thedevelopment,release,andtimingofanyfeaturesorfunctionalitydescribedforOracle’sproductsremainsatthesolediscretionofOracle.

oracle data guard 12.2 - 18c - doag.org · • in oracle database 12c release 2, a storage failure...

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