VSAM – KSDS
KSDS is known as Key Sequenced Data Set. A key-sequenced data set (KSDS) is more complex than ESDS and RRDS but is more useful and versatile. We must code INDEXED inside the…
VSAM – ESDS
ESDS is known as Entry Sequenced Data Set. An entry-sequenced data set behaves like sequential file organization with some more features included. We can access the records directly and for…
VSAM – Cluster
VSAM cluster is defined in JCL. JCL uses IDCAMS utility to create a cluster. IDCAMS is a utility, developed by IBM, for access method services. It is used to primarily define VSAM datasets.…
VSAM – Components
VSAM consists of following components − VSAM ClusterControl AreaControl Interval VSAM Cluster VSAM are the logical datasets for storing records and are known as clusters. A cluster is an association…
VSAM – Home
VSAM stands for Virtual Storage Access Method. VSAM is a file storage access method used in MVS, ZOS and OS/390 operating systems. It was introduced by IBM in 1970's. It…
JCL – Basic Sort Tricks
The day-to-day application requirements in a corporate world that can be achieved using Utility Programs are illustrated below: 1. A file has 100 records. The first 10 records need to…
JCL – Utility Programs
IBM Dataset Utilities Utility programs are pre-written programs, widely used in mainframes by system programmers and application developers to achieve day-to-day requirements, organising and maintaining data. A few of them…
Running COBOL Programs using JCL
Compiling COBOL Programs In order to execute a COBOL program in batch mode using JCL, the program needs to be compiled and a load module is created with all the…
Input-Output Methods
Any batch program executed through a JCL requires data input, which is processed and an output is created. There are different methods of feeding input to the program and writing…
JCL – Defining Datasets
A dataset name specifies the name of a file and it is denoted by DSN in JCL. The DSN parameter refers to the physical dataset name of a newly created…
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