DB2 12 for zOS Technical Overview Part 2 - Ningapi.ning.com/.../DB212forzOSTechnicalOverviewPart2.pdf · • Support DELETE operation ... • table expression with union all ... DB2

DB212forz/OSTechnicalOverviewPart2

JohnCampbellDistinguishedEngineerIBMDB2forz/OSDevelopment

LogisticsandQuestions

• Thepresentationisavailablefordownloadfromtheresourceslist

• Thewebcastswillbeavailableonreplay

• Youcansubmitquestionsbytypingintothequestionsareaofyourwebcastcontrolpanelatleast15minutesbeforetheendofthewebcast.

• Questionswillbeansweredastimepermits

• Anyquestionsnotansweredduetotimeconstraintswillbeansweredafterthewebcastandaddedtothe“Resourceslist”

2

Disclaimer/Trademarks

3

© 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

4

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

5

APPLICATIONENABLEMENT

6

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

7

DB2RESTful

JSON

DB2

GettingRESTandJSONintoyourmainframeenvironmentinawaythatenablesyoutobesttakeadvantageoftheassetsthatexistthere:

• LibertyProfileServer

Providesacommonandconsistententrypointformobileaccesstooneormanybackendsystems

Simplifiesfront-endfunctionsbyallowingthemtopassRESTful andJSONratherthanbeawareoforinvolvedindatatransformation

IBMBlueMix

8

EnterpriseApps

EnterpriseData

EnterpriseTransactionProcessing

CICS,IMS

Batch,WAS

SystemsofRecord

On-PremiseEnterpriseAPIs

CloudAPIs

Mobile-OptimizedAPIs

Cloud-basedServices

EnterpriseSystems

Integrationz/OS

Connect

Cloud/MobileintegrationwithDB2andz/OSConnect

8

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

9

MotivationforIntegratedSolutioninDB2• DB2integratedRESTAPIfunctionalitymaintainingz/OSConnectexternalsasapplicablefor

• ReuseofDDFfunctionalitythatprovidesahighlyavailable,highlyscalableandhighlyserviceablenetworkinterface

• SupportofclientInfofields• DDFprovidessecurity,auditing,anddatatransformationasbeingprovidedusingz/OSConnect

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

• Newcatalogtable• Staticexecutionpattern– authorisationchecking,objectdependencytracking

10

RESTfulJSON

DB2z/OSDDF

DRDA DRDAparsing

Authcheck

ThreadCreation

SQLexecution

RESTAPI

httpsandJSONparsing

DataServerClient

Application

z/OSConnectEERESTAPI

RESTAPI

RESTfulServiceSupportinDB2

11

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

12

ApplicationRelatedEnhancements• DRDAFastLoad– callablecommandforfaststreamingofdataintoDB2• Systemprofilingenhancements

• Autostartofsystemprofiles• Setglobalvariablesbasedonprofiles(e.g.transparentarchiving)

• NewMODIFYDDFPKGREL(BNDPOOL)option• PoolhighperformanceDBATsatconnectiontermination

• DSNULIsupportforIMSAttach• LonglistofSQLandXMLimprovements

13

DRDAFastLoad• Problem:

• DB2providestheDSNUTILUstoredproceduretoloaddatafromaclient• Butthisisdifficulttouse,applicationmusttransferdatatoz/OSfile

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

• PlanstousethisfeatureforfastwritefromSpark

14

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

• TIMESTAMPwithTIMEZONEsupport• MulticontextsupportusingASSOCIATE/DISSOCIATETHREAD• Abilitytopreservedynamicstatementcacheafterrollback

• SQLPaginationsyntaxsupport– OFFSETnandLIMIT• SupportprepareAttribute literalreplacementasBINDPACKAGEoption

15

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)

16

EnhancedMergeSupport• DB2z/OSinitialsupportforMERGEstatementwithlimitedfunctionalitywasdeliveredwithVersion9:

• LimitedtoUPDATEandINSERTandonlyoneofeach• Focusedonuseofhostvariablecolumnarraystoprovidemultiplerowsofinputdata

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

17

SQLPagination• Withthegrowthofwebandmobileapplications,applicationdevelopersarelookingformoreefficient

waystodevelopgoodperformingapplications

• Numeric-basedpagination• SELECT*FROMtabOFFSET10ROWSFETCHFIRST10ROWSONLY

• Data-dependentpagination• Existingsyntax:

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

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

18

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

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

19

Piece-wiseModificationofData• Mitigatetheeffectsoflockingandloggingwhenpotentiallymillionsofrowscouldbeaffectedbya

simplestatementlike:"DELETEFROMT1WHEREC1>7“

• Solution• Supportfullselect asthetargetofaDELETEstatementswherethefullselect allowsfortheFETCHFIRSTNROWS

ONLYtobespecified.

• DELETEFROM(SELECT*FROMT1WHEREC1>7FETCHFIRST5000ROWSONLY)

20

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

• ArrayGlobalVariables• LOBGlobalVariable• FETCHstatementandglobalvariablesasatarget• EXECUTEstatementandglobalvariables• OPENstatementandGlobalVariables

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

21

DB212SQLPLTriggers• Richcapabilityintriggerbody

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

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

• ProvidesabetterwaytochangeatriggerwithoutDROP,CREATE• Canchangetriggeronlineandmaintaintriggeractivationorder

• Richercapabilitymeanssomeperformanceoverheadcomparedtoanequivalenttraditionaltrigger

22

XMLImprovements

23

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

24

JSON CLP

DB2

JSONEnhancement

25

>>-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

26

LiftingPartitionLimits– ProblemStatement• MaximumnumberofpartitionsisdependentonDSSIZEandpagesize

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

• AllpartsinheritthesameDSSIZEsetattablespacelevel• Noabilitytohavedifferingpartitionsizes• Rebalancemustrunagainstmultiplepartitions

• Maximumtablesizelimitedto16TB

27

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

28

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!

29

OnlineSchema• Insertpartition(seenextslide)• OnlinedeferredALTERINDEXCOMPRESSYES

• PreviouslyplacedindexesinRBDP• Optiontodefercolumn-levelALTERs

• Materialise throughonlineREORG• Avoidavailabilityconstraints&conflictwithotherdeferredalters

30

InsertPartition• Problemstatement

• Largerange-partitionedtablesoftenhavehotspotsandrebalancingacrossentiresetofpartitionsisonerous• Partitioningschemechoseninthepastmaynolongerbeoptimal

• Solution• Abilitytoinsertanewpartitionwithspecifiedlimitkey value

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

31

PendingColumnLevelAlter• Problemstatement

• Somecolumn-levelaltersresultinapplicationimpact• e.g.indexesplacedinRBDP

• Immediatealtersconflictwithpendingalters• AdditionalREORGsrequiredtomaterializependingalterstoavoidDDLfailures

• Solution• Allowexistingimmediatealterstobecomependingalters,UTSonly• AllpendingaltersaccumulatedandmaterializedthroughonlineREORG• Newzparm

• ALWAYSIMMEDIATE:Existingbehaviorforexistingalters• ALWAYSPENDING:Currentimmediatealtersareconvertedtopendingalters

• ALTERCOLUMNtypetoavoidRBDPonindexes

32

Security&GeneralEnhancements• LOBcompression

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

33

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

34

Utilities…• REORG…

• Upto17%additionaloffloadtozIIP• ThereloadphasecannowbezIIP offloaded

• Newmappingtableformatsupport• Thenewformatsupports7bytesRIDsneededwithUTSPBRRPNsupport

• PermitREORGagainstROpagesets• REORGwithanySHRLEVELcanberunagainstanyROtablespaceandindex• RetrofittedbacktoservicelevelwithAPARPI46774)

• Displayclaimerinformationoneachdrainfailure,notjustlastretry

35

Utilities…• LOAD

• LOADPARTREPLACEwithdummyinputagainstemptyPBRpartition• NPIprocessingoptimizedtonotscanthewholeNPItofindkeystobedeletedforthepartitionbeingREPLACEd ifitwas

alreadyempty• ReduceselapsedtimeandCPUtimesignificantlyiftherewerealotofkeysfortheotherlogicalpartsoftheNPI• Upto99%CPU98%ElapsedTimereduction

• LOADSHRLEVELCHANGEPARALLELsupportforUTSPBG• ModifiedtoremovethesingleinputparallelismrestrictionforPBGtablespacesforLOADSHRLEVELCHANGE• Labmeasurementssawupto76%elapsedtimesavingswithsomeCPUoverhead• LOADSHRLEVELNONEPBGPARALLELisstillarestriction

• Upto90%additionalzIIP offload• RELOADphaseoftheLOADutilitycanbezIIP offloaded• Thisincludesthedataconversionandloadingoftherecordintothepageset

36

Utilities…• LOAD…

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

key,RIconstraint)withoutleavingthepagesetinRECP• PREFORMATsupportforauxtables

• Indicatestheremainingpagesarepreformatteduptothehigh-allocatedRBAinthetablespaceandindexspacesthatareassociatedwiththetablethatisspecifiedintable-name

37

Utilities…• LOAD…

• MaintainMAXASSIGNEDVALforidentitycolumns• ThisenhancementmaintainstheMAXASSGINEDVALforuserprovidedinputandalsowillresetthevalueifaLOADREPLACE

onthetablespaceisrun• EliminatedatasharingoverheadwithUNLOADISO(UR)REGISTERNOoption

• NewoptiontobypasspageregistrationintheCouplingFacilityandavoidanydatasharingoverhead• LOADREPLACEsupportforCOMPRESSRATIOcolumn

• Gatherstheaveragecompressratioattherecordlevelinsteadofthepagesavedlevel

38

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)

39

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

40

Utilities…• RUNSTATS

• UsePROFILEsupportforinlinestatsinREORG&LOAD• COLGROUPinlinestatssupportforLOADPARALLEL• INVALIDATECACHEoptiontoavoiddynamicstatementcacheinvalidation

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

• WhenCOLGROUPcolumnspecificationsareredundantwithINDEXcolumns,theduplicateCOLGROUPisignoredinlieuoftheindexprocessing

41

Utilities…• RUNSTATS…

• NewDSNUTILVstoredproceduresupportCLOBinput>32MB• TheDSNUTILVUTSTMTutilitystatementparameterisnowaCLOBinsteadofaVARCHAR,soDB2nowsupportsa4byte

length(upto2GB)• ForexistingapplicationsstillpassingaVARCHAR,DB2willdotheconversionfromVARCHARtoCLOB

• DSNACCOXchangesforREORGavoidance• NumberofrecommendationsreducedbychangingthedefaultforrecommendingREORGbasedonthenumberofinserts

andpseudodeletessincethelastREORGtooff• RemovesthecriteriaofrecommendingaREORGbasedonREORGLASTTIME,LOADRLASTTIME,orREBUILDLASTTIMEbeing

NULL• ImprovedutilityconcurrencyforMODIFY,COPYTOCOPY,MERGCOPY

• AllowsMODIFYRECOVERY,COPYTOCOPY,MERGECOPY,andexclusiveutilitieslikeLOADandREORGtorunconcurrentlyonthesametargetobjects

42

DataSharingImprovements• Supportforglobaltransactions• DDFsharedsessiondataacrossgroup

• DDFtransactionre-routing,sessiontokenforclientfail-over• Datasharingperformanceimprovements:

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

43

DataSharingImprovements…• Newdatasharingpeerrecoveryoption• RetryofautomaticLPLandGRECPrecovery• AsynchronousCFLockduplexing(notyetenabled)

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

lockstructurebeforethecorrespondingundo/redorecordfortheupdateiswrittentoDB2theactivelogonDASD

• Increasesthepracticaldistanceformulti-sitesysplex operationswhilstduplexingofCFLOCK1andSCAstructures• Plannedas4Q2016deliverablewith

• z/OS2.2APAR• z13GA2CFCC21

44

DataSharingImprovements…• SynchronousCFlockstructureduplexing– howitworkstoday

45

CF1PrimaryLock

CF2Secondary

Lock

IRLMandDB2XES1.Requestin

2.Requestout

4.Response

5.Responseoutz/OS

3.Communication

4.Response2.Requestout

DataSharingImprovements…• Asynchronous CFlockstructureduplexing– howitwillnowwork

46

z/OS

CF1PrimaryLock

CF2Secondary

Lock

IRLMandDB2XES

1.Requestin

2.Requestout

3.Response

4.Responseoutz/OS

5.Communication

Query

6.Orderedexecution

TopDB2zSocialMediaChannels#DB2z

• JointheWorldofDB2 www.worldofdb2.com

• Follow @IBMDB2onTwitterhttps://twitter.com/IBMDB2

• JoinDB2zLinkedInGroup

• https://www.youtube.com/user/IBMDB2forzOS

• DB2zonFacebook• https://www.facebook.com/IBMDB2forzOS/

47

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

• DB2forz/OS RESTful APIenablingtheMobileEconomy - 11thApril

• DB212MigrationPlanningandVeryEarlyExperiencesPART1- 16thMay

• DB212MigrationPlanningandVeryEarlyExperiencesPART2- 17thMay

• DB212forz/OSDataSharingEnhancements6thJune

• DB2forz/OSandFlashCopy:PracticalUseCases- 13thJune

• UsingLargerRealMemorySizewithDB2forz/OStoreduceCPU- June27th

48

Now… LiveQ&AwithJohnCampbell