IBM OS manual Benets of dynamic routing, What does dynamic routing cost?, Transaction affinities

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The bene®ts of dynamic routing

 

Being able to route transactions to target regions dynamically offers many bene®ts

 

in an online transaction processing (OLTP) system. The user can achieve:

 

v

Improved performance

 

v

Improved availability

 

v

Simpli®ed systems management

 

What does dynamic routing cost?

 

Of course, the CICS-supplied code cannot determine where to send a transaction,

 

this depends on your CICS environment and routing policies. It needs a facility for

 

you to specify your routing policies in a form that CICS can use. This can be a

user-written dynamic routing program used to supply the name of a suitable target

region, or you can use the dynamic routing program EYU9XLOP provided with

CICSPlex SM.. You can de®ne the name of a dynamic routing program on either

the DTRPGM system initialization (SIT) parameter, for terminal-related START and

dynamic program link (DPL) requests, or the DSRTPRG SIT parameter for

non-terminal-related START requests and CICS BTS processes.

 

At the basic level, a dynamic routing program simply contains tables of user

transaction identi®ers, with the matching system identi®ers (SYSIDs) of the target

regions that can process the transactions. At the highest and most sophisticated

 

level, the dynamic routing program would also be capable of detecting and

 

managing any special factors that might affect transaction routing.

One factor that can affect the otherwise free choice of target region is the use of

 

particular CICS programming techniques that transactions use to pass data from

 

one to another.

Transaction affinities

CICS transactions use many different techniques to pass data from one to another. Some techniques require that the transactions exchanging data must execute in the same CICS region, and therefore impose restrictions on the dynamic routing of transactions. If transactions exchange data in ways that impose such restrictions, there is said to be an affinity between them.

There are two categories of affinity:

vInter-transaction affinity; see ªInter-transaction affinityº on page 4

vTransaction-system affinity; see ªTransaction-system affinityº on page 4

The restrictions on dynamic routing caused by transaction affinities depend on the duration and scope of the affinities. Clearly, the ideal situation for a dynamic routing program is for there to be no transaction affinity at all, which means there is no

restriction in the choice of available target regions for dynamic routing. However, even when transaction affinities do exist, there are limits to the scope of these affinities determined by the:

vAffinity relations; see ªAffinity relationsº on page 4

vAffinity lifetime; see ªAffinity lifetimesº on page 5

Chapter 1. Introducing transaction affinities 3

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Contents IBM Page IBM Third edition March Contents Appendix A. Details of what is detected Reporter output Scanner output Examples Vi Cics Transaction Affinities Utility Guide Vii Trademarks Preface Argument zero Cics Transaction Server for OS/390 BibliographyCics books for Cics Transaction Server for OS/390 Other Cics books CICSPlex SM books for Cics Transaction Server for OS/390Summary of changes Xiv Cics Transaction Affinities Utility Guide Affinities, see the Cics Application Programming Guide Introducing transaction affinitiesRouting region Requesting regionTarget region What does dynamic routing cost? Benets of dynamic routingTransaction affinities Global Inter-transaction affinityTransaction-system affinity Affinity relationsCics programming techniques for transaction affinity Affinity lifetimesAvoiding the effects of transaction affinity Safe programming techniquesUnsafe programming techniques Suspect programming techniquesProtecting applications from one another What next? Important note Introducing the Transaction Affinities UtilityAffinity utility program components Commands detected by the Transaction Affinities Utility Detector component Scanner componentDetector components What is detectedWorsening of transaction affinities relations What is not detectedHow the affinity data is collected Controlling the DetectorSaving affinity data Control record Vsam le Affinity data Vsam lesReport presenting the affinity data in a readable form Detector performanceReporter component Builder componentIntroducing the Transaction Affinities Utility Cics Transaction Affinities Utility Guide Creating the Vsam les Preparing to use the affinity utility programEstimating the size of the MVS data space and Vsam les #termids Dening the Vsam les to CicsPreparing to use the affinity utility program Cics Transaction Affinities Utility Guide Creating a summary report Running the ScannerAffmod DD statement Cics Transaction Affinities Utility Creating a detailed reportContents of a detailed report Is an example of a detailed report produced by the Scanner Cics Transaction Affinities Utility Guide Changing the state Running the DetectorChanging the options CAFF01 Displaying the Detector control screenStarting the collection of affinity data When you can start collecting affinity dataResuming the collection of affinity data Pausing the collection of affinity dataWhen you can pause affinity data collection When you can resume collecting affinity dataStopping the collection of affinity data When you can stop collecting affinity dataCAFF02 Changing the Detector options„1… The control options Perform periodic saves Restore data on start„2… Detect affinity types „4… Last update by useridSize of dataspace Transid prexDetector errors Cics Transaction Affinities Utility Guide Caucntl DD statements Running the ReporterRequesting a report from the Reporter CAUAFF1, CAUAFF2, and CAUAFF3 DD statementsCmdgrps DD statement Output from the ReporterTrangrps DD statement System Affinity reportTrangroup „1… Incorrect affinity types„2… Affinity types reported „3… Affinities reportsLifetime RecoverableCommand AffinityTotal Transactions Producing affinity transaction group denitionsTerminal BTS TaskAfflifesystem Descaddress CWA Using the affinity reportRemove affinity relation worsening Understanding the affinitiesModifying affinity transaction groups Remove false affinitiesCompressing affinity data Shared storage Using the IBM Cross System ProductSPI commands ENQUEUEs/DEQUEUEsENQUEUE/DEQUEUE Detailed affinity analysisGetmain Shared SPI commands Cics Transaction Affinities Utility Guide DSPSIZE=16number Running the BuilderCONTEXT=plexname Repgrps DD statement Syntax for input to the BuilderAffgrps DD statement Builder input syntax Output from the Builder Header statementsCombined affinity transaction group denitions Combining basic affinity transaction groups Relation a Relation B Resultant relation C Empty transaction groups report Data sets processed reportGroup merge report Sample group merge report Error reportSample error report Cics Transaction Affinities Utility Guide ENQ/DEQ Appendix A. Details of what is detectedLoad HOLD/RELEASE TS commandsAddress CWA CANCEL/DELAY/POST/START Wait commands SPI commandsCics Transaction Affinities Utility Guide Scanner output Reporter outputExamples Example 2±VS Cobol Which occurs for the rst Move Move Cobol affinities Logon or System when Pconv expectedUnrecognized Transids Cics Transaction Affinities Utility Guide Detector table manager diagnostics Appendix D. DiagnosticsFunction code values Table identier values Reason code values This section Detector Cafb request queue manager diagnosticsDate formatter diagnostics Reason code valuesIndex Bappl Vsam Cics Transaction Affinities Utility Guide Sending your comments to IBM Ibmr IBM

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