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 bene®ts 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 ®les

17

The control record VSAM ®le

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

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IBM OS manual Contents

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.

One of the defining features of IBM OS is its robust multitasking capabilities. Both z/OS, predominantly used in IBM's mainframe environments, and AIX, the Unix-based system for IBM Power Systems, support multiple users and processes simultaneously. This ability allows organizations to run numerous applications in parallel efficiently, maximizing resource utilization and improving productivity.

In terms of security, IBM OS incorporates advanced features aimed at protecting data and maintaining integrity. z/OS offers multifactor authentication, data encryption, and a security model that adheres to the latest regulatory requirements. AIX provides Secure Virtualization, which enhances isolation and security in cloud environments, essential for enterprises handling sensitive information.

Another key characteristic is the adaptability of IBM OS to modern technologies. For instance, z/OS is designed to integrate with cloud computing, open source, and DevOps practices. This adaptability supports organizations in modernizing their infrastructure while retaining the stability associated with IBM solutions. AIX similarly supports containerization and virtualization, which are critical for optimizing resource usage in dynamic computing environments.

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.

The availability of development tools and environments is another noteworthy aspect of IBM OS. With robust IDEs and programming languages support, developers can create and deploy applications smoothly. This assists businesses in streamlining their development processes and improving time-to-market for innovative solutions.

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.