DB212forz/OSTechnicalOverviewPart2

JohnCampbellDistinguishedEngineerIBMDB2forz/OSDevelopment

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Disclaimer/Trademarks

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© Copyright IBM Corporation 2017. All rights reserved.U.S. Government Users Restricted Rights - Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp.

THE INFORMATION CONTAINED IN THIS DOCUMENT HAS NOT BEEN SUBMITTED TO ANY FORMAL IBM TEST AND IS DISTRIBUTED AS IS. THE USE OF THIS INFORMATION OR THE IMPLEMENTATION OF ANY OF THESE TECHNIQUES IS A CUSTOMER RESPONSIBILITY AND DEPENDS ON THE CUSTOMER’S ABILITY TO EVALUATE AND INTEGRATE THEM INTO THE CUSTOMER’S OPERATIONAL ENVIRONMENT. WHILE IBM MAY HAVE REVIEWED EACH ITEM FOR ACCURACY IN ASPECIFIC SITUATION, THERE IS NO GUARANTEE THAT THE SAME OR SIMILAR RESULTS WILL BE OBTAINED ELSEWHERE. ANYONE ATTEMPTING TO ADAPT THESE TECHNIQUES TO THEIR OWN ENVIRONMENTS DO SO AT THEIR OWN RISK.

ANY PERFORMANCE DATA CONTAINED IN THIS DOCUMENT WERE DETERMINED IN VARIOUS CONTROLLED LABORATORY ENVIRONMENTS AND ARE FOR REFERENCE PURPOSES ONLY. CUSTOMERS SHOULD NOT ADAPT THESE PERFORMANCE NUMBERS TO THEIR OWN ENVIRONMENTS AS SYSTEM PERFORMANCESTANDARDS. THE RESULTS THAT MAY BE OBTAINED IN OTHER OPERATING ENVIRONMENTS MAY VARY SIGNIFICANTLY. USERS OF THIS DOCUMENT SHOULD VERIFY THE APPLICABLE DATA FOR THEIR SPECIFIC ENVIRONMENT.

TrademarksIBM, the IBM logo, ibm.com, DB2, System z and z/OS are trademarks of International Business Machines Corp., registered in many jurisdictions worldwide. Other product and service names might be trademarks of IBM or other companies. A current list of IBM trademarks is available on the Web at “Copyright and trademark information” at www.ibm.com/legal/copytrade.shtml.

Objectives• IntroduceanddiscussthenewfeaturesofDB212forz/OS• Provideplanninginformationformigration• Understandthenewperformancefeatures

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Agenda• Introduction• Performancefocus– traditionalworkloads• Performancefocus– enablingmodernapplications• Migration• Applicationenablement• Reliability,availability,scalability,security

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APPLICATIONENABLEMENT

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DB2forz/OSadaptingtomodernApplicationDevelopmentparadigms• ManymodernapplicationdevelopersworkwithRESTservicesandJSONdataformats• DB2Adaptorforz/OSConnectprovidesthemeanstodothis• Betainprogress,plannedforDB210and11aswellasDB212

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DB2RESTful

JSON

DB2

GettingRESTandJSONintoyourmainframeenvironmentinawaythatenablesyoutobesttakeadvantageoftheassetsthatexistthere:

• LibertyProfileServer

Providesacommonandconsistententrypointformobileaccesstooneormanybackendsystems

Simplifiesfront-endfunctionsbyallowingthemtopassRESTful andJSONratherthanbeawareoforinvolvedindatatransformation

IBMBlueMix

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EnterpriseApps

EnterpriseData

EnterpriseTransactionProcessing

CICS,IMS

Batch,WAS

SystemsofRecord

On-PremiseEnterpriseAPIs

CloudAPIs

Mobile-OptimizedAPIs

Cloud-basedServices

EnterpriseSystems

Integrationz/OS

Connect

Cloud/MobileintegrationwithDB2andz/OSConnect

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Latest News• Native DB2 REST API with DB2 11 APARs PI66828 & PI70477

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MotivationforIntegratedSolutioninDB2• DB2integratedRESTAPIfunctionalitymaintainingz/OSConnectexternalsasapplicablefor

• ReuseofDDFfunctionalitythatprovidesahighlyavailable,highlyscalableandhighlyserviceablenetworkinterface

• SupportofclientInfofields• DDFprovidessecurity,auditing,anddatatransformationasbeingprovidedusingz/OSConnect

• PERMITDSN.RESTCLASS(DSNR)ID(DB2USER)ACCESS(READ)• DDFRestAPIwouldbereadyoutofthebox• Allowsadatabaseadministratortomanageservices

• Newcatalogtable• Staticexecutionpattern– authorisationchecking,objectdependencytracking

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RESTfulJSON

DB2z/OSDDF

DRDA DRDAparsing

Authcheck

ThreadCreation

SQLexecution

RESTAPI

httpsandJSONparsing

DataServerClient

Application

z/OSConnectEERESTAPI

RESTAPI

RESTfulServiceSupportinDB2

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NativeDB2RESTAPISupport• CREATE|DROP|START|STOPServiceusingeitherDataStudioV1support,ordirectDB2DDFRESTAPI

• SamplePOSThttps://<host>:<port>/services/DB2ServiceManager{"requestType":"createService«....}

• DiscoverallservicesanddiscoverdetailsforaspecificserviceusingdirectDB2DDFRESTAPI• POSThttps://<host>:<port>/services/DB2ServiceDiscover• {["collectionID":"<collectionID>"]

• DB2RESTServiceinvocation• DB2Adapterforz/OSConnectV1invocationAPIsyntax• NewdirectDB2DDFRESTinvokeAPI

• SupportedINSERT,UPDATE,DELETEandcursorbasedSELECT• CALLsupportwithIN/OUT/INOUTparametersundresultsets• AllofthevariousDB2baseSQLtypes

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ApplicationRelatedEnhancements• DRDAFastLoad– callablecommandforfaststreamingofdataintoDB2• Systemprofilingenhancements

• Autostartofsystemprofiles• Setglobalvariablesbasedonprofiles(e.g.transparentarchiving)

• NewMODIFYDDFPKGREL(BNDPOOL)option• PoolhighperformanceDBATsatconnectiontermination

• DSNULIsupportforIMSAttach• LonglistofSQLandXMLimprovements

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DRDAFastLoad• Problem:

• DB2providestheDSNUTILUstoredproceduretoloaddatafromaclient• Butthisisdifficulttouse,applicationmusttransferdatatoz/OSfile

• Solution:• DB2ClientAPI(CLIandCLP)forremoteloadintoDB2• Easyandfastloadingofdatafromfilethatresidesonclient• Internalformat(SAP),aswellasdelimitedandspanned(LOBdata)• Applicableforsome“cloud”usecases• OverlapnetworkoperationswithdataingestontheDB2server• MeasuredresultsshowasfastorfasterthanDB2LOADutility

• PlanstousethisfeatureforfastwritefromSpark

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SQLEnhancements• SimpleVALUESusingdynamicSQL– V10,V11• JDBC/ODBCType2performanceEnhancements• ODBCdriverimprovements:

• TIMESTAMPwithTIMEZONEsupport• MulticontextsupportusingASSOCIATE/DISSOCIATETHREAD• Abilitytopreservedynamicstatementcacheafterrollback

• SQLPaginationsyntaxsupport– OFFSETnandLIMIT• SupportprepareAttribute literalreplacementasBINDPACKAGEoption

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SQLEnhancements…• Keepviews,UDFsintactonDDLforunderlyingtables• Increasemaximumnumberoftablesreferencedinview,UDF,statement• EnhancedMERGEsupport(seenextslide)• SQLpaginationimprovements• Newbuiltinfunctions

• HEX2BIN(V11)• MEDIAN,PERCENTILE_CONT,PERCENTILE_DISC• COUNT(DISTINCTx)• GENERATE_UNIQUE– newoptionallengthparm• HASHfunctions(CRC32,MD5,SHA1,SHA256)

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EnhancedMergeSupport• DB2z/OSinitialsupportforMERGEstatementwithlimitedfunctionalitywasdeliveredwithVersion9:

• LimitedtoUPDATEandINSERTandonlyoneofeach• Focusedonuseofhostvariablecolumnarraystoprovidemultiplerowsofinputdata

• InDB212,DB2z/OSMERGEstatementwillbealignedwithbehaviordefinedinSQLStandardandDB2family• Sourcedataasatable-reference• MultipleMATCHEDclauses• AdditionalPredicateswith[NOT]MATCHED• SupportDELETEoperation• AllowIGNOREandSIGNAL

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SQLPagination• Withthegrowthofwebandmobileapplications,applicationdevelopersarelookingformoreefficient

waystodevelopgoodperformingapplications

• Numeric-basedpagination• SELECT*FROMtabOFFSET10ROWSFETCHFIRST10ROWSONLY

• Data-dependentpagination• Existingsyntax:

WHERE(LASTNAME=:lname ANDFIRSTNAME>=:fname)OR(LASTNAME>:lname)

• NewequivalentsyntaxWHERE(LASTNAME,FIRSTNAME)>=(:lname,:fname)

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SQLEnhancements…• UnicodecolumnsinEBCDICtables• PiecemealDELETE– allowforinterimcommits• MQUDFenhancements:allowMQmessageheadertobepassed• BiTemporal enhancements

• Auditingenhancements– V11• Inclusive/inclusiveforbusinesstime• Logicaltransactionforsystemtime• TemporalRI

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Piece-wiseModificationofData• Mitigatetheeffectsoflockingandloggingwhenpotentiallymillionsofrowscouldbeaffectedbya

simplestatementlike:"DELETEFROMT1WHEREC1>7“

• Solution• Supportfullselect asthetargetofaDELETEstatementswherethefullselect allowsfortheFETCHFIRSTNROWS

ONLYtobespecified.

• DELETEFROM(SELECT*FROMT1WHEREC1>7FETCHFIRST5000ROWSONLY)

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SQLEnhancements…• APPLCOMPATsupportforDB212:V12R1Mnnnwhere nnn >=500• Globalvariableenhancements

• ArrayGlobalVariables• LOBGlobalVariable• FETCHstatementandglobalvariablesasatarget• EXECUTEstatementandglobalvariables• OPENstatementandGlobalVariables

• SQLPL• SQLPLintriggers,includingtriggerversioninganddebuggingsupport• Supportforconstants• SQLPLobfuscation• DynamicSQLinSQLPLUDFsandstoredprocedures• DBMS_OUTPUTforUDFtracing– V11

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DB212SQLPLTriggers• Richcapabilityintriggerbody

• AllowSQLPLcontrolstatements• IF-THEN-ELSE,LOOP,REPEAT,…

• AllowmoreSQLstatements,dynamicSQL,variables,handlers• EasierportingoftriggersfromotherDBMSes• DEBUGGERsupport• VERSIONssupport

• ProvidesabetterwaytochangeatriggerwithoutDROP,CREATE• Canchangetriggeronlineandmaintaintriggeractivationorder

• Richercapabilitymeanssomeperformanceoverheadcomparedtoanequivalenttraditionaltrigger

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XMLImprovements

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ImprovetheperformanceoftheXMLqueriesbychoosingoptimalaccess:

76%/77%reductionintheClass1/Class2timerespectively.

ImprovetheperformanceofXMLTable thatconductsthepivot-likeoperationtoXMLdatawithname-valuepairpattern:

90%CL2CPUimprovementusingcustomer'sxmldata/queries

ImproveperformanceanddeveloperproductivitybyallowingmultipleupdateinsideXMLModify function:

Upto90%improvementinET;upto97%improvementinCPUtime(whencomparingtosemanticsequivalentsingleupdate)

XSLTRANSFORMfunctionforXMLextenderusers

AllowforeasymigrationtopureXML

DB2forz/OSexistingsupportforJSON• Storedatafromweb/mobileapplicationsinitsnativeform

• ManywebapplicationsuseJSONforstoringandexchanginginformation

• JSONisoftenthepreferreddataformatformobileapplicationback-ends

• Movefromdevelopmenttoproductioninnotime• AbilitytocreateanddeployflexibleJSONschemas• GivespowertodependencyonIT

• Noneedtopre-determineschemasandcreate/modifytables• Idealforagile,rapiddevelopmentandcontinuousintegration

• DB2providestwowaysforworkingwithJSON• JavadriverforJSONAPI• SQLextensions– DB211,withenhancementsinDB212

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JSON CLP

DB2

JSONEnhancement

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>>-JSON_VAL—(--json-value--,--search-string--,--result-type--)---------><ToextractandretrieveJSONdataintoSQLdatatypesfromBSON

Example(before):

JSON_VAL(column1,'PO.customer.@cid','i:na')

InDB212,weremovetherequirementthat1st parameterhastobeaBLOBcolumn(alreadyretrofittoV11inPI39003)

InV12,wesupportmoreoptionsas1st parameter:• viewcolumn• CASEexpression• tableexpressionwithunionall• triggertransitionvariable• SQLPLvariable/parameter

RELIABILITY,AVAILABILITY,SCALABILITY,SECURITY

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LiftingPartitionLimits– ProblemStatement• MaximumnumberofpartitionsisdependentonDSSIZEandpagesize

• e.g.,IfDSSIZE=256GBandpagesize=4Kthenmaximumnumberofpartsis64• Runningoutofspaceinapartitionisanapplicationoutage• WhenalteringDSSIZE,REORGmustrunonentiretablespace• DSSIZEisattablespaceLevelandnotatpartlevel

• AllpartsinheritthesameDSSIZEsetattablespacelevel• Noabilitytohavedifferingpartitionsizes• Rebalancemustrunagainstmultiplepartitions

• Maximumtablesizelimitedto16TB

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LiftingPartitionLimits– Solution• NewUTSPBRtablespacestructurecalled‘UTSPBRRPN’

• Userelativepagenumbers(RPN)insteadofabsolutepagenumbers• Simplicity,usability,availability,scalability• Removedependencybetweennumberofpartitionsandpartitionsize• 7-byteRIDs(2bytepartnumber,5bytepagenumber)

• Upto256trillionrowsinasingletable• NewREORGmappingtableformat,optionaluntilnewfunctionenabled

• Supportupto1TBpartitionsize• Maximumtablesizeincreasedfrom16TB(4Kpagesize)to4PB

• Architectedtogoevenlarger• IncreasingDSSIZEissupportedatpartition-level• NewDSSIZEsupportforindexes

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LiftingPartitionLimits– Considerations• Conversion/Exploitation:

• zparm tocontrolwhethercreationofrangepartitionedusesrelativepagenumbering• PAGENUMRELATIVE/ABSOLUTEoptiononCREATE&ALTERTABLESPACE• Conversionispendingalter- requirestablespace-levelonlineREORG• OnlinealtertoincreaseDSSIZE– immediate,non-disruptive• OnlinealtertodecreaseDSSIZE- pendingalterrequiringtablespace-levelREORG

• Logrecordformatschangedtosupport7byteRIDs• Improvedserviceability,DSN1LOGPnowformatspartitionnumberexplicitly• Newlogrecordformatwrittenin“CM”,requiringfallbacktolerationsupportinV11• NotjustforRPNpagesets!

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OnlineSchema• Insertpartition(seenextslide)• OnlinedeferredALTERINDEXCOMPRESSYES

• PreviouslyplacedindexesinRBDP• Optiontodefercolumn-levelALTERs

• Materialise throughonlineREORG• Avoidavailabilityconstraints&conflictwithotherdeferredalters

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InsertPartition• Problemstatement

• Largerange-partitionedtablesoftenhavehotspotsandrebalancingacrossentiresetofpartitionsisonerous• Partitioningschemechoseninthepastmaynolongerbeoptimal

• Solution• Abilitytoinsertanewpartitionwithspecifiedlimitkey value

• ALTERTABLEADDPARTITIONENDINGATxxx• Splitexistingpartition,distributedatabetweennewandold• Onlinechangethroughpendingalter• Onlyaffectedpartition(s)needtobeREORGed• NoPITrecoverypriortomaterializingREORG

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PendingColumnLevelAlter• Problemstatement

• Somecolumn-levelaltersresultinapplicationimpact• e.g.indexesplacedinRBDP

• Immediatealtersconflictwithpendingalters• AdditionalREORGsrequiredtomaterializependingalterstoavoidDDLfailures

• Solution• Allowexistingimmediatealterstobecomependingalters,UTSonly• AllpendingaltersaccumulatedandmaterializedthroughonlineREORG• Newzparm

• ALWAYSIMMEDIATE:Existingbehaviorforexistingalters• ALWAYSPENDING:Currentimmediatealtersareconvertedtopendingalters

• ALTERCOLUMNtypetoavoidRBDPonindexes

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Security&GeneralEnhancements• LOBcompression

• zEDC hardwarerequirement• ImprovedLOBhandlingforISO(UR)queriestoavoidSQLCODE+100• TRANSFEROWNERSHIP• Permitinstallation,migrationwithoutInstallSYSADMauthoritytolimitdataaccess• NewUNLOADprivilege• Supportlong,camel-casedDBRMnames• IFCID306logrecordsreturnedinthecorrectversion

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Utilities• REORG

• ImprovedFlashcopy management• REORGwithonlyaFLASHCOPYinlineimagecopy(notraditionalICs)nowcausesREORGtofail(RC=8)iftheflashcopy fails

• Improvedpart-levelUTSPBGREORGs• SupportscreationofnewPBGpartitionforoverflowrowsduringapartlevelreorg

• Preventcopy-pendingonLOBtablespaceduringREORGofUTSPBGs• AvoidleavingcopypendingonLOBtablespaceswhennewPBGpartitionsgrownduringlogphaseofREORG

• REORG-levelmanagementofdeleteofUTSPBGpartitions• Addanewkeyword,DROP_PART,forREORGemptyUTSPBGpartitionpruningwhenzparm alterationisnotfeasible

• SupportnewCOMPRESSRATIOcatalogcolumn• AddLOAD/REORG/RUNSTATSabilitytogatheraveragecompressratioattherecordlevelinsteadofthepagesavedlevel

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Utilities…• REORG…

• Upto17%additionaloffloadtozIIP• ThereloadphasecannowbezIIP offloaded

• Newmappingtableformatsupport• Thenewformatsupports7bytesRIDsneededwithUTSPBRRPNsupport

• PermitREORGagainstROpagesets• REORGwithanySHRLEVELcanberunagainstanyROtablespaceandindex• RetrofittedbacktoservicelevelwithAPARPI46774)

• Displayclaimerinformationoneachdrainfailure,notjustlastretry

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Utilities…• LOAD

• LOADPARTREPLACEwithdummyinputagainstemptyPBRpartition• NPIprocessingoptimizedtonotscanthewholeNPItofindkeystobedeletedforthepartitionbeingREPLACEd ifitwas

alreadyempty• ReduceselapsedtimeandCPUtimesignificantlyiftherewerealotofkeysfortheotherlogicalpartsoftheNPI• Upto99%CPU98%ElapsedTimereduction

• LOADSHRLEVELCHANGEPARALLELsupportforUTSPBG• ModifiedtoremovethesingleinputparallelismrestrictionforPBGtablespacesforLOADSHRLEVELCHANGE• Labmeasurementssawupto76%elapsedtimesavingswithsomeCPUoverhead• LOADSHRLEVELNONEPBGPARALLELisstillarestriction

• Upto90%additionalzIIP offload• RELOADphaseoftheLOADutilitycanbezIIP offloaded• Thisincludesthedataconversionandloadingoftherecordintothepageset

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Utilities…• LOAD…

• LOADRESUMESHRLEVELNONEBACKOUTYEStoavoidRECPforpagesetonfailure• Newoptiontoallowbackout ofrowsalreadyloadeduponencounteringanerror(suchasconversion,LOB/XML,duplicate

key,RIconstraint)withoutleavingthepagesetinRECP• PREFORMATsupportforauxtables

• Indicatestheremainingpagesarepreformatteduptothehigh-allocatedRBAinthetablespaceandindexspacesthatareassociatedwiththetablethatisspecifiedintable-name

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Utilities…• LOAD…

• MaintainMAXASSIGNEDVALforidentitycolumns• ThisenhancementmaintainstheMAXASSGINEDVALforuserprovidedinputandalsowillresetthevalueifaLOADREPLACE

onthetablespaceisrun• EliminatedatasharingoverheadwithUNLOADISO(UR)REGISTERNOoption

• NewoptiontobypasspageregistrationintheCouplingFacilityandavoidanydatasharingoverhead• LOADREPLACEsupportforCOMPRESSRATIOcolumn

• Gatherstheaveragecompressratioattherecordlevelinsteadofthepagesavedlevel

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Utilities…• Backup&Recovery

• PITrecoverysupportforUTSPBGtablespaces• AllowrecoveryofPBGUTStoaPITpriortoaREORGthatmaterializedthesephysicalpendingalters:pagesize(buffer

pool),DSSIZE,SEGSIZE,MEMBERCLUSTER• FLASHCOPY_PPRCP parameterforRESTOREandRECOVER

• Allowsuserstospecify/overridethepreservemirroroptionforPPRC(syncdiskmirroring)ontheutilitystatement• Previously:RESTORESYSTEMusedHSMdefault;RECOVERusedzparm FLASHCOPY_PPRC

• OptiontoskipPITrecoveryfornon-updatedpagesets• New*default*behaviorforPITRECOVERutility- objectswhichwerenotupdated*after*therecoverypointareskipped

andnotrecovered• Reasoning:thedataintheseobjectsstillreflectthatPIT,sononeedtorecover• SavesCPUresourceconsumptionandandelapsedtime• ThisdefaultbehaviorcanbeoverriddenwithSCOPE(ALL)

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Utilities…• Backup&Recovery…

• SystemLevelBackupsupportformultiplecopypools• BACKUPSYSTEMandRESTORESYSTEMnowsupportmultiplecopypools• Allowstheusertokeepdaily“goldencopy”orbackupforcriticalevents

• DFSMShsm messagesincludedinutilityjoboutputforBACKUP/RESTORESYSTEM• ImprovedmessagingforBACKUPSYSTEMandRESTORESYSTEM• HSMandDSSmessagesareincludedintheDB2utilityjoboutputsothattheuserdoesnothavetolookinthe(separate)

HSMjoblogsformessages• Availablewithz/OSV2.2

• COPYoptiontospecifyFASTREPLICATION(REQUIRED)• AnewCOPYutilityzparm COPY_FASTREPLICATIONREQ|PREF|NONEallowstheusercontrolofwhetherFlashCopy is

requiredduringcreationoftheFlashCopy imagecopy• WithFASTREPLICATIONREQUIRED,DSSwillallocatetargetdatasetwithinsameDASDbox,ensuringthatFlashCopy canbe

used• PreviouslyCOPYdefaultedtoFASTREPLICATIONPREFERRED

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Utilities…• RUNSTATS

• UsePROFILEsupportforinlinestatsinREORG&LOAD• COLGROUPinlinestatssupportforLOADPARALLEL• INVALIDATECACHEoptiontoavoiddynamicstatementcacheinvalidation

• Defaultbehaviorhaschangedtonotinvalidatepreparedstatements• COLGROUPperformance– 25%CPU,15%ElapsedTimereduction

• WhenCOLGROUPcolumnspecificationsareredundantwithINDEXcolumns,theduplicateCOLGROUPisignoredinlieuoftheindexprocessing

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Utilities…• RUNSTATS…

• NewDSNUTILVstoredproceduresupportCLOBinput>32MB• TheDSNUTILVUTSTMTutilitystatementparameterisnowaCLOBinsteadofaVARCHAR,soDB2nowsupportsa4byte

length(upto2GB)• ForexistingapplicationsstillpassingaVARCHAR,DB2willdotheconversionfromVARCHARtoCLOB

• DSNACCOXchangesforREORGavoidance• NumberofrecommendationsreducedbychangingthedefaultforrecommendingREORGbasedonthenumberofinserts

andpseudodeletessincethelastREORGtooff• RemovesthecriteriaofrecommendingaREORGbasedonREORGLASTTIME,LOADRLASTTIME,orREBUILDLASTTIMEbeing

NULL• ImprovedutilityconcurrencyforMODIFY,COPYTOCOPY,MERGCOPY

• AllowsMODIFYRECOVERY,COPYTOCOPY,MERGECOPY,andexclusiveutilitieslikeLOADandREORGtorunconcurrentlyonthesametargetobjects

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DataSharingImprovements• Supportforglobaltransactions• DDFsharedsessiondataacrossgroup

• DDFtransactionre-routing,sessiontokenforclientfail-over• Datasharingperformanceimprovements:

• ImprovedlockavoidancecheckingtoreduceCFlockrequests• In-memoryindexescanreduceGetPages andCFGBPrequests• ImprovedinsertspacesearchcanavoidP-lockcontentionandstreamlineinserts• RUNSTATSandUNLOADISOLATION(UR)toavoidCFpageregistration

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DataSharingImprovements…• Newdatasharingpeerrecoveryoption• RetryofautomaticLPLandGRECPrecovery• AsynchronousCFLockduplexing(notyetenabled)

• ReducesoverheadforsystemmanagedduplexingofCFLOCK1andSCAstructures• Secondarystructureupdatesareperformedasynchronously withrespecttoprimaryupdates• DB2willsyncupwithz/OStoensuredataintegrityi.e.,allmodifylockshavebeen“hardened”inthesecondary

lockstructurebeforethecorrespondingundo/redorecordfortheupdateiswrittentoDB2theactivelogonDASD

• Increasesthepracticaldistanceformulti-sitesysplex operationswhilstduplexingofCFLOCK1andSCAstructures• Plannedas4Q2016deliverablewith

• z/OS2.2APAR• z13GA2CFCC21

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DataSharingImprovements…• SynchronousCFlockstructureduplexing– howitworkstoday

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CF1PrimaryLock

CF2Secondary

Lock

IRLMandDB2XES1.Requestin

2.Requestout

4.Response

5.Responseoutz/OS

3.Communication

4.Response2.Requestout

DataSharingImprovements…• Asynchronous CFlockstructureduplexing– howitwillnowwork

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z/OS

CF1PrimaryLock

CF2Secondary

Lock

IRLMandDB2XES

1.Requestin

2.Requestout

3.Response

4.Responseoutz/OS

5.Communication

Query

6.Orderedexecution

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RegisterNowcomingDB2Webcasts#DB2z- http://ibm.biz/DB2z2017WebcastSeries

• DB2forz/OS RESTful APIenablingtheMobileEconomy - 11thApril

• DB212MigrationPlanningandVeryEarlyExperiencesPART1- 16thMay

• DB212MigrationPlanningandVeryEarlyExperiencesPART2- 17thMay

• DB212forz/OSDataSharingEnhancements6thJune

• DB2forz/OSandFlashCopy:PracticalUseCases- 13thJune

• UsingLargerRealMemorySizewithDB2forz/OStoreduceCPU- June27th

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Now… LiveQ&AwithJohnCampbell