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Contents
Notices ........................... vii
Trademarks..........................viii
Preface ........................... ix
What this book is about ..................... ix
Who this book is for...................... ix
What you need to know to understand this book ........... ix
How to use this book ..................... ix
Determining if a publication is current ............... ix
Notes on terminology ..................... x
Bibliography ......................... xi
CICS Transaction Server for OS/390 ................ xi
CICS books for CICS Transaction Server for OS/390 ......... xi
CICSPlex SM books for CICS Transaction Server for OS/390 ...... xii
Other CICS books ...................... xii
Summary of changes......................xiii
Changes for the CICS Transaction Server for OS/390 Release 3 edition . . . xiii
Changes for the CICS Transaction Server for OS/390 Release 2 edition . . . xiii
Changes for the CICS Transaction Server for OS/390 Release 1 edition . . . xiii
Chapter 1. Introducing transaction affinities ............. 1
The benefits of dynamic routing .................. 3
What does dynamic routing cost?................. 3
Transaction affinities ...................... 3
Inter-transaction affinity .................... 4
Transaction-system affinity ................... 4
Affinity relations ....................... 4
Affinity lifetimes ....................... 5
CICS programming techniques for transaction affinity .......... 5
Safe programming techniques .................. 6
Unsafe programming techniques ................. 6
Suspect programming techniques................. 6
Avoiding the effects of transaction affinity ............... 6
Protecting applications from one another ............... 7
Chapter 2. Introducing the Transaction Affinities Utility ........ 9
Commands detected by the Transaction Affinities Utility .........11
The Scanner component .....................12
The Detector component .....................12
What is detected .......................13
What is not detected .....................14
Controlling the Detector ....................15
How the affinity data is collected .................15
Saving affinity data ......................16
The affinity data VSAM files ...................17
The control record VSAM file ..................17
Detector performance .....................18
The Reporter component .....................18
The Builder component .....................18
Chapter 3. Preparing to use the affinity utility program ........21
© Copyright IBM Corp. 1994, 1999 iii