job (all definitions available to all steps). OS/390 operation does not perform this

²carry-over² (unique to VSE).

4.5.1Sample VSE JCL

This example shows one POWER job containing three VSE jobs.

*$$ JOB JNM=MYJOB,CLASS=F,USER=′ ITSO SAMPLE′

*$$ LST LST=SYSLST,JSEP=0,CLASS=W,COPIES=3

//

JOB JOB1

extract records from tape

//

ASSGN SYS005,480

input tape

//TLBL TAPEIN,′ INPUT-TAPE′

//DLBL DISKOUT,′ WORK-DISK′ , O,SD

//EXTENT DISK01,1,0,100,500

//EXEC PROGRAM1,SIZE=AUTO

// MTC SYS005,RUN

unload tape

/*

 

*check previous job

//PAUSE in case it abended

/*

/&

// JOB JOB2

SORT WORK FILE BY PLANT NUMBER

*$$ LST LST=SYSLST,JSEP=0,CLASS=A // DLBL SORTIN,′ WORK-DISK′ , 0 , SD

// EXTENT DISKO1,0

// DLBL SORTOUT,′ WORK-DISK 2′ , 0 , SD // EXTENT DISK14,0,600,500

/ DLBL SORTWK1,′%%SORT.WORK1′ , 0 , VSAM,RECSIZE=100,RECORDS=50000,

C

 

DISP=(NEW,DELETE)

 

// DLBL SORTWK2,′%%SORT.WORK2′ , 0 , VSAM,RECSIZE=100,RECORDS=50000,

C

 

DISP=(NEW,DELETE)

 

// EXEC SORT,SIZE=200K

 

 

SORT FIELDS=(1,32,CH,A),WORK=2

 

 

RECORD TYPE=F,LENGTH=87

 

 

INPFIL BLKSIZE=4350

 

 

OUTFIL BLKSIZE=4350

 

/*

 

*

SORT ENDED

 

/&

 

// JOB JOB3

PRINT REPORT

//DLBL DISKIN,′ WORK-DISK 2′ , 0 , SD

//EXTENT DISK14,0

//DLBL PRODCAT,′ PROD.USER.CATALOG′ , , VSAM

//DLBL MASTER,′ PLANT.MASTER.FILE′ , , VSAM,CAT=PRODCAT

//EXEC PROGRAM2,SIZE=300K

*$$ LST LST=SYS010,DEST=KCJONES 01 ENDICOTT

*$$ LST LST=SYS010,DEST=HERBERT

02 BOEBLINGEN /* /&

*$$ EOJ

92VSE to OS/390 Migration Workbook

Page 116
Image 116
IBM OS/390 manual Sample VSE JCL

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.