No special considerations apply to the compile and link step under VSE/ESA except that the product library which contains MQSeries for VSE/ESA has to be in the library chain during compilation.

You have to set up jobs to compile and link the program under OS/390. General considerations how to do this for a CICS COBOL application are described in the respective chapters in this book. In addition the following applies to MSQeries applications:

include in the SYSLIB statement of the compilation statements that make the product data definition files available to the compiler. For COBOL the data definitions are supplied in the library thlqual.SCSQCOBC.

in your link-edit JCL, the MQSeries for MVS/ESA CICS stub program (CSQCSTUB) must be included. The stub is language independent and is supplied in library thlqual.SCSQLOAD.

For details please refer to MQSeries Application Programming Guide,

SC33-0807.

9.5.5 Bibliography

For MQSeries for VSE/ESA:

MQSeries for VSE/ESA Version 1 Release 4 Users Guide, SC33-1142

For MQSeries for MVS/ESA:

MQSeries Application Programming Guide, SC33-0807

MQSeries Planning Guide, GC33-1349

MQSeries Application Programming Reference Summary, SX33-6095

MQSeries Intercommunication, SC33-1872

MQSeries Command Reference, SC33-1369

MQSeries Programmable System Management, SC33-1482

MQSeries Application Programming Reference, SC33-1673

MQSeries for MVS/ESA Licensed Program Specifications, GC33-1350

MQSeries for MVS/ESA System Management Guide, SC33-0806

MQSeries for MVS/ESA Problem Determination Guide, GC33-0808

MQSeries for MVS/ESA Messages and Codes, GC33-0819

MQSeries Clients, GC33-1632

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IBM OS/390 manual SC33-0807

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.