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IBM OS/390 manual Overview Cics Transaction Server, 133

Models: OS/390

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Chapter 6. CICS

6.1 Introduction

This section is directed to individuals with a working knowledge of both CICS for VSE/ESA and CICS Transaction Server. Without this knowledge, a reader may find this section less fulfilling. Also, you should understand that the scope of this section is to provide general migration tasks and considerations, and should not be considered a replacement for the manuals referenced in this section and/or an individual CICS migration experience.

In the context of this chapter, CICS for VSE/ESA 2.3 is the source subsystem, on which the subject migration activities and consideration are based, although some notes discuss parameters and/or illustrations of pre-CICS for VSE/ESA 2.3 subsystems. Also, references to CICS for VSE/ESA 2.3 may be used interchangeably with CICS/VSE or CICS/DOS/VS.

CICS Transaction Server for OS/390 1.2 is the resultant migrated subsystem, in which all activities/tasks should reside. Please note that references to CICS Transaction Server 1.2 may be used interchangeably with CICS/ESA, and/or CICS.

In the final section CICS with DL/I DOS/VS is discussed. References to DL/I

DOS/VS may be used interchangeably with DL/I.

6.1.1 Overview CICS Transaction Server

As an overview, the base CICS element of CICS Transaction Server is CICS 5.2. This element, the CICS successor to CICS/ESA 4.1, is exclusive and includes features and products available with prior CICS versions:

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CICS Web Interface

Open Network Computing Remote Procedure Call (ONC RPC) CICS Transaction Affinities Utility

CICS-DB2 attachment facility

The non-exclusive elements of the product, also available as separate products, are:

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REXX Development System for CICS/ESA REXX Runtime Facility for CICS/ESA CICS Distributed Data Management (DDM) CICS Application Migration Aid Version 1.1 CICSPlex SM Version 1.3

CICS Clients Version 2.0.2

Transaction Server for OS/2 Warp Version 4 (90-day evaluation copy)

New functions included in this release of the single package solution are:

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Support for single MVS (R) image systems using the DASD logging function of OS/390, provided in OS/390 Version 2 Release 4. Supports single image in sysplex configurations without a coupling facility (non-parallel sysplex) and stand-alone OS/390 systems (single-system sysplex).

New interface that allows 3270-based CICS transactions to run unchanged without a 3270 terminal.

© Copyright IBM Corp. 1998

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IBM OS/390 manual Overview Cics Transaction Server, 133
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OS/390 specifications

IBM OS/390, a versatile operating system, was a cornerstone in enterprise environments and played a pivotal role in mainframe computing. Released in the mid-1990s, OS/390 combined the strengths of IBM's MVS (Multiple Virtual Storage) with new features and enhancements, targeting scalability, reliability, and performance in demanding business applications.

One of the key features of OS/390 was its robust support for multiple users and processes. The system allowed thousands of concurrent users to access applications and data, ensuring high availability and minimizing downtime—a critical requirement for many large organizations. This scalability was supported through various enhancements in memory management and processor scheduling, enabling optimal resource allocation across diverse workloads.

OS/390 was known for its superior workload management capabilities. The Workload Manager (WLM) component allowed administrators to define service policies, specifying how system resources would be allocated according to the priority of tasks. This ensured that critical business processes received the necessary resources while less critical tasks were managed more flexibly.

Another significant characteristic of OS/390 was its commitment to security. The operating system provided comprehensive security features, including user authentication, data encryption, and auditing capabilities. This focus on security was vital for organizations handling sensitive data, ensuring compliance with regulations and safeguarding against unauthorized access.

OS/390 also supported advanced technologies that facilitated integration and development. The system included features like the IBM CICS (Customer Information Control System) for transaction processing and IMS (Information Management System) for database management. These technologies allowed organizations to build robust, high-performance applications tailored to specific business needs.

The ease of network integration was another strength of OS/390. With the advent of the Internet and global connectivity, OS/390 systems could easily interface with various network protocols, enabling businesses to operate in a connected world. This inclusion paved the way for many organizations to expand their capabilities and offer new services, driving digital transformation.

In conclusion, IBM OS/390 represented a significant advancement in mainframe technology, combining scalability, security, and robust workload management. Its rich feature set and support for critical enterprise applications solidified its role as a vital component of many organizations' IT infrastructures, ensuring they could meet their operational challenges head-on while supporting future growth. As technology continues to evolve, the legacy of OS/390 remains influential in the realm of computing.