Table 7 (Page 2 of 2). VSE Job Control Statements Summary

VSE

Function

MVS Equivalent

Statement

 

 

 

 

 

ON

Causes specified action to be done if

// EXEC COND= or

 

the specified condition is true after

//IF/ENDIF

 

any step in the following job stream.

 

 

 

 

OPTION

Sets one or more of the job control

// EXEC PARM=

 

options.

 

 

 

 

PAUSE

Causes a pause immediately after

No equivalent in OS/390.

 

processing this statement, or at the

 

 

end of the current job step.

 

 

 

 

PROC

Defines and initializes symbolic

// PROC

 

parameters in a procedure.

 

 

 

 

PWR

Passes a PRELEASE or PHOLD

/*$command

 

command to POWER.

 

 

 

 

QUERY

Displays information on data spaces

No equivalent in OS/390.

 

and standard options.

 

 

 

 

RESET

Resets I/O assignments to the

No equivalent in OS/390.

 

standard assignments.

 

 

 

 

RSTRT

Restarts a checkpointed program.

// JOB RESTART=

 

 

 

SETPARM

Assigns a character string or return

// SET

 

code to the specified parameter.

 

 

 

 

SETPFIX

Defines limits for PFIXing pages.

No equivalent in OS/390.

 

 

 

SETPRT

Loads the IBM 3800 buffers.

// DD or

 

 

// OUTPUT

 

 

 

STDOPT

Resets system defaults.

No equivalent in OS/390.

 

 

 

SYSDEF

Defines limits and defaults for data

No equivalent in OS/390.

 

spaces.

 

 

 

 

TLBL

Contains file label information for

// DD dsname= , LABEL=

 

tape label checking and writing.

 

 

 

 

UPSI

(User Program Switch Indicators)

No equivalent in OS/390.

 

Allows the user to set program

(Use // EXEC PARM=)

 

switches that can be tested.

 

 

 

 

VDISK

Defines the layout of a virtual disk.

No equivalent in OS/390.

 

 

 

ZONE

Initializes the zone field in the

No equivalent in OS/390.

 

communications region.

 

 

 

 

/.

Label statement.

No equivalent in OS/390.

 

 

 

/*

Indicates the end of a data file.

/*

 

 

 

/&

Indicates the end of a job.

//

 

 

 

*

Job control comments.

See JES2 control statements

 

 

below

 

 

 

/ +

Indicates the end of a procedure or

// PEND

 

librarian End-of-Data.

 

 

 

 

Chapter 4. Job Control Language (JCL) Differences and Considerations 87

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IBM OS/390 manual 2 of 2. VSE Job Control Statements Summary

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.