Axxana NoCOUG 11-2017nocoug.org/download/2017-11/Azagury_Squeezing_the... · 12c Disaster Recovery...

Title

©AllRightsReserved.Axxana2017©AllRightsReserved.Axxana2017

SqueezingtheMaxoutof12cDisasterRecovery

AlainAzagury,VPR&DYossiNixon,OracleACEAssociate&ChiefDBANovember2017

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AlainAzagury,VPR&DØ 30-yearsofexperiencein

Storage,Virtualization,Cloud,Systems,MemoryManagement,etc.

Ø IBMMasterInventor,withover15patents

Ø Avidcyclist

Speakers

Confidential

YossiNixon,ChiefDBAØ OracleACEAssociate,

DatabaseArchitectandOracleDBAwith20yearsofexperience.Specialties:DBA&InfrastructureArchitect;DisasterRecoveryStrategyDevelopment; Monitoringandtroubleshooting;DesigningandWritingcode....

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DataGuardOverviewDataGuardTermsActiveDataGuardFarSyncDataGuardDRenhancementsinOracle12cLessonsLearnedTheRisk-DistanceConundrumAxxana’s PhoenixTechnologyPuttingitalltogether

Agenda

©AllRightsReserved.Axxana2007-2017CONFIDENTIAL

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DataGuardOverview

Primary RemoteStandby

SYNC/ASYNC


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©AllRightsReserved.Axxana2017©AllRightsReserved.Axxana2017©AllRightsReserved.Axxana2007-2017CONFIDENTIAL

DataGuardTerms

RedoCompression

SYSDGRole

FlashbackDatabaseonDG

FastStartFailoverFSFOOnline

StandbyDatabase

FileRename

Switchover/Failover

SnapshotStandby

CascadedRedoRMAN

DuplicatefromActive

Database

AutomaticGap

ResolutionActiveDataGuard

Read-OnlyPhysicalStandby

FarSyncStandbyRedoLogs

Real-timeapply

ManagedRecovery

FastSync

DataGuardBroker

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ActiveDataGuardFarSync

Confidential

FarSync


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FarSync:light-weightOracleinstance:standbycontrolfile,standbyredologs,archivedredologs,nodatafilesReceivesredosynchronouslyfromprimary,forwardsredoasynchronouslyinreal-timetostandbyUponFailover:Async standbytransparentlyobtainslastcommittedredofromFarSyncandapplies:zerodatalossfailoverMinimalCPU,memory,orI/O– Norecovery,nodatafiles,productionneverrunsontheFarSyncinstance

ActiveDataGuardFarSync

Confidential

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FarSyncsummary

• Verypromisingforlongdistancereplicationifdatalossisnotacceptable

• Upto60%performancegain(DMLonlyworkloads)with25msnetworklatency

• Lightweightandeasytodeploy(virtualmachine)• Iflatency<5msmostlikelyyoudon’tneedFarSync• Therearestillbugsthatneedfixing

RedoTransport

25ms

Redo

Far Sync

sync async


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FarSyncSyntax


SQL > ALTER DATABASE CREATE FAR SYNC INSTANCE CONTROLFILE AS ‘/tmp/farsync.ctl’;SQL > create pfile=‘/tmp/initfs.ora' from spfile;

SQL > ALTER DATABASE ADD STANDBY LOGFILE THREAD 2 SIZE 52428800;SQL > create spfile from pfile=‘/tmp/initfs.ora';

DGMGRL> ADD FAR_SYNC fs AS CONNECT IDENTIFIER IS fs;

DGMGRL> EDIT DATABASE pdb SET PROPERTY RedoRoutes = '(LOCAL : fs SYNC ALT =(sdb ASYNC FALLBACK))';

https://oracledba.blogspot.com/2017/08/creating-far-sync-instance-step-by-step.html

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LabEnvironmentSetup

Oracle12.1EnterpriseEditionActiveDataguard withFarSyncASMRequestedtailoredpatchesforFarSyncOracleLinux7.2

ServerenvironmentPrimary– 2xLenovo X3550M5(2xXeonE5-2620V32.4Ghz,32GBmemory,4SSDs)Secondary – Identical toPrimaryFarSync – Two configurations

i7/16GB/dual SSDor,Quad Xeon/32GB/4SSDs

Neutralizednetworklatencyissues10GbEconnectivityAllsystemsarecollocated

1to16instancesUpto8instancesoneachprimary/secondaryserverUpto16instancesonFarSyncserver

Primary StandbyFarSync

10

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SetupObservations

FarSync


AlternateAlternateOppositedirection

MaximumAvailability

Nomultiplex

RMANdeletionpolicy


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✅ MemoryConsumption

✅ Networking

✅ LatencyreductionthroughFastSync

✅ CPUConsumption

✅ FarSyncIOpatterns

LessonsLearned

Confidential

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ConfigurationUsedtherecommendedSGAallocation

300MBSGA

TheFarSyncinstancerequiresaverysmallSGAfootprint(muchlessthanproduction)

NodatabasefilesNomediarecovery

Considerallocatingmemoryforstoragecache(later…)

MemoryConsumption

Confidential

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ConfigurationJumboframesmakeahugedifference

WeusedMTU9000Bondingtwo10GbEports

NetworkTrafficisConsistentwithLogFileWritethroughput

Byteswritten=BytesreceivedbyFarSyncInstance=BytesSentbyFarSyncInstance

TuneLOG_ARCHIVE_MAX_PROCESSEStomaximizethroughput

Transportcompressionwillreducetraffic… buttakesitstollonCPUcycles…

Networking

Confidential

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Standbyacknowledgestheprimaryassoonasitreceivesredoinmemory

WithoutwaitingfordiskI/Otoastandbyredologfile

Maingoalisshorteningthetotalround-triptimebetweenprimaryandstandbyWedidn’tseeyetsignificantbenefitfromFastSync(NOAFFIRM),needmoreexperimentation!

LatencyReduction– FastSync

Confidential

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FollowedOracle’srecommendationReducingtheCPU_COUNTduringtestinghadnoeffectontheperformanceoftheFarsyncinstance

VirtualKeeperofTimeProcess(es)(VKTM)arehighCPUconsumer

OneprocessperDatabaseandASMinstancesSeveral“solutions”havebeenrecommendedtoreduceitspriority✅SignificantimprovementachievedwhenFarSync

runsmultipleinstances!

TransportcompressiontakesitstollonCPUcycles…

CPUConsumption

Confidential

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RedoentriesstoredinStandbyRedoLogsandArchivesFarSyncdoesnottakeadvantageoflog_buffer memorytoreduceI/O

IOsmaybereducedthroughsmartcachingtechniques…

ReduceRedoLogmembers

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FarSyncIOPatterns

Confidential

StandbyRedoLogs

Archives

1 2

3 4

Cache

FarSync

RemoteStandbyPrimary

Read

Write

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AdditionalObservations

Confidential

FarSync


AlternateAlternateOppositedirection

MaximumAvailability

Nomultiplex

RMANdeletionpolicy

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UsingDataGuardBrokerisstronglyrecommended,especiallywhenusingFarSync

No“easy”waytocollect database statistics,sinceFarSyncisnotadatabase!

WhenusingFarSync,usethelatestpatchsets

RollingForwarda PhysicalStandbyDatabaseUsingtheRECOVERFROMSERVICEiscool(FirstintroducedinOracle12.1)

AdditionalObservations (cont.)

Confidential

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BlockComparisontoolinDGMGRLMultipleObserversSupportsAWRonActiveDGforthestandbyDataGuardStandbyCreationwithdbcaMulti-InstanceRedoApplyFastFailover- DataGuardtakesoversessiondrainingPasswordfileismanagedandtransportedviatheRedomechanismAlternateprioritization

Oracle12.2NewFeatures

Confidential

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InMemoryColumnstoreworkswithmulti-instanceredoapplyMulti-instanceredoapplysupportwithBlockChangeTracking(BCT).GlobalTemporaryTablesupportfromStandby.DMLoperationsonStandby– RedirectiontoPrimarywithoutACIDcompromise.Preservebuffercacheduringrole-change.Nologgingenhancement- PerformancemodeandAvailabilitymode.RMAN- Refreshastandbyfromprimary/backupusingsingleRECOVERcommand

Oracle18cNewFeatures


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DistanceBetweenPrimaryandFarSync

Distance-RiskConundrum

Confidential

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Axxana– TransparentLayeredProtection

Confidential

PhysicalProtection

MultipleNetworkConnectivityWAN,LAN,Wi-Fi,4G

BatteryPowered

DataSafe

PhoenixOSSmartDR

FarSyncVirtualMachine

ManagedbytheUser

TransparentlyManaged

byAxxana

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ActiveDataGuardFarSyncwithAxxana

Confidential


ASYNCover10GbE

ZeroDistanceSYNC Recoveryover

Cellular/1GbE/10GbE

AxxanaProtectedFarSync

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WhatisAxxanaallabout?

Averyresilientflashbasedstorageandserverina(black)boxDirectfireofupto1100°Cforanhour250°Cfor6hours5mdroponreinforcedconcrete2.3tonsofweight1mwaterpressurePierceforceof230kgrodwithcross-sectionof.25cm2 droppedfrom3mheightSelfsufficientpowersourceIndependentcellularandWiFicommunication

Inanutshell– abunkerinabox25

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WinningCombination

Confidential

AxxanaBlackBoxPhoenixOS

OracleActiveData

GuardFarSync

✅ ZeroDataLossatanydistance

✅ NoRTT(latency)Compromise

✅ TrueProtectionagainstLinkFailure

✅ ApplicationConsistencyGuarantee

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Seeforyourself…

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[email protected]

Axxana NoCOUG 11-2017nocoug.org/download/2017-11/Azagury_Squeezing_the... · 12c Disaster Recovery...

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Transcript of Axxana NoCOUG 11-2017nocoug.org/download/2017-11/Azagury_Squeezing_the... · 12c Disaster Recovery...