IBM OS Introducing transaction affinities, Affinities, see the Cics Application Programming Guide

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Chapter 1. Introducing transaction affinities

 

This chapter provides a brief introduction to the concept of transaction affinities and

 

the associated CICS programming techniques, and highlights the signi®cance of

transaction affinities in a dynamic routing (known in previous releases of CICS as

dynamic transaction routing) environment. For more information about transaction

 

affinities, see the CICS Application Programming Guide.

This chapter introduces the following topics:

vªThe bene®ts of dynamic routingº on page 3

vªTransaction affinitiesº on page 3

vªCICS programming techniques for transaction affinityº on page 5

vªAvoiding the effects of transaction affinityº on page 6

vªProtecting applications from one anotherº on page 7

CICS has been handling customers' online transaction processing requirements for over thirty years. In that time, it has been extensively enhanced to meet the ever-growing needs of business applications, and to exploit the capabilities of modern computer processors and communication systems. One of the most

signi®cant enhancements in recent times is the addition of the dynamic routing facility.

Originally, a full-function CICS ran in a single address space (region) within the MVS environment. Currently, most CICS users use some form of intercommunications to operate multiple, interconnected, CICS regions (a CICSplex). Using the CICS multiregion operation (MRO) facility, a CICSplex typically consists of one or more terminal-owning regions (TOR), and a number of application-owning regions to which the TORs route the incoming transactions for processing. The CICSPlex SM element of CICS Transaction Server for OS/390 Release 3 includes a workload management component that optimizes processor capacity by dynamically routing transactions to whichever CICS region is the most appropriate at the time, taking into account any transaction affinities that exist. For an introduction to CICSPlex SM, see CICSPlex SM Concepts and Planning; for information about CICSPlex SM workload management, see CICSPlex SM Managing Workloads.

CICS A

Terminal-Owning

Region (TOR)

End-user

 

 

 

 

MRO

 

terminal

 

 

 

 

CICS Relay

 

 

 

 

 

 

 

 

 

 

 

 

Transaction

 

 

links

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 1. The CICS transaction routing facility

CICS B

Application-Owning

Region (AOR)

User

Transaction

Before CICS Transaction Server for OS/390 Release 3, TORs routed transactions to the AORs prede®ned in transaction resource de®nitions by the system programmer. This static form of transaction routing adds to the system administration burden of the system programmer, because when transaction workloads have to be rebalanced across the AORs, transaction resource de®nitions have to be modi®ed accordingly.

© Copyright IBM Corp. 1994, 1999

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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 books for Cics Transaction Server for OS/390 BibliographyCics 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 affinitiesTarget region Requesting regionRouting region Transaction affinities Benets of dynamic routingWhat does dynamic routing cost? Transaction-system affinity Inter-transaction affinityAffinity relations GlobalCics programming techniques for transaction affinity Affinity lifetimesUnsafe programming techniques Safe programming techniquesSuspect programming techniques Avoiding the effects of transaction affinityProtecting 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 lesReporter component Detector performanceBuilder component Report presenting the affinity data in a readable formIntroducing the Transaction Affinities Utility Cics Transaction Affinities Utility Guide Estimating the size of the MVS data space and Vsam les Preparing to use the affinity utility programCreating the 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 options Running the DetectorChanging the state CAFF01 Displaying the Detector control screenStarting the collection of affinity data When you can start collecting affinity dataWhen you can pause affinity data collection Pausing the collection of affinity dataWhen you can resume collecting affinity data Resuming the collection of 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 startSize of dataspace „4… Last update by useridTransid prex „2… Detect affinity typesDetector errors Cics Transaction Affinities Utility Guide Requesting a report from the Reporter Running the ReporterCAUAFF1, CAUAFF2, and CAUAFF3 DD statements Caucntl DD statementsTrangrps DD statement Output from the ReporterCmdgrps DD statement System Affinity report„2… Affinity types reported „1… Incorrect affinity types„3… Affinities reports TrangroupCommand RecoverableAffinity LifetimeTerminal Producing affinity transaction group denitionsBTS Task Total TransactionsAfflifesystem Descaddress CWA Using the affinity reportModifying affinity transaction groups Understanding the affinitiesRemove false affinities Remove affinity relation worseningCompressing affinity data SPI commands Using the IBM Cross System ProductENQUEUEs/DEQUEUEs Shared storageENQUEUE/DEQUEUE Detailed affinity analysisGetmain Shared SPI commands Cics Transaction Affinities Utility Guide CONTEXT=plexname Running the BuilderDSPSIZE=16number Affgrps DD statement Syntax for input to the BuilderRepgrps DD statement Builder input syntax Combined affinity transaction group denitions Header statementsOutput from the Builder Combining basic affinity transaction groups Relation a Relation B Resultant relation C Group merge report Data sets processed reportEmpty transaction groups 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 Examples Reporter outputScanner output Example 2±VS Cobol Which occurs for the rst Move Move Unrecognized Transids Logon or System when Pconv expectedCobol affinities Cics Transaction Affinities Utility Guide Function code values Appendix D. DiagnosticsDetector table manager diagnostics Table identier values Reason code values Date formatter diagnostics Detector Cafb request queue manager diagnosticsReason code values This sectionIndex Bappl Vsam Cics Transaction Affinities Utility Guide Sending your comments to IBM Ibmr IBM

OS specifications

IBM OS, or IBM Operating System, refers to a family of operating systems developed by IBM to support its hardware architectures. IBM has produced a range of OS versions tailored for different computing needs, such as mainframes, servers, and personal computers. Among the most notable operating systems in IBM's portfolio are OS/2, z/OS, and AIX, representing a blend of innovation and reliability that has defined IBM's reputation in the computing world.

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IBM's commitment to scalability is evident across its OS offerings. Organizations leveraging z/OS can handle enormous workloads and transactional volumes, making it a preferred choice for industries like finance and telecommunications. AIX also supports scalability, allowing businesses to expand their computing resources as demands grow without significant downtime.

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In summary, IBM OS encompasses a suite of operating systems characterized by multitasking, security, adaptability to modern technologies, scalability, and comprehensive development support. These features have cemented IBM's position as a leader in enterprise solutions, allowing organizations across various industries to thrive in an increasingly digital world.
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