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This is an example of a COBOL program and JCL that will create and process a Generation Data Group or GDG on a Mainframe System with ZOS or a Linux. Generation Data Groups (GDGs) are group of datasets related to each other by a common name. The common name is referred as GDG base and each dataset. JCL & VSAM: Hi all, I want to know the major difference between the dataset and GDG. reagrds akshatha.

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The operating system’s catalog management routines use the absolute generation name. The Gcg parameter refers to the physical dataset name of a newly created or existing dataset.

Other uses will require a SimoTime Software License. Our customers include small businesses using Internet technologies to corporations using very large mainframe systems.

What is GDG Model? We’ll introduce you to the hardware and peripherals. We have a team of grg that understand the broad range of technologies being used in today’s environments. The intent is to provide changes as the need arises and in a timeframe that is dependent upon the availability of resources. This document and the links to other documents are intended to provide a greater awareness of bdg Data Management and Application Processing alternatives.

The current generation is called Generation 0. Mainframe people seem to speak a completely different language and that doesn’t make life easy. SimoTime Technologies makes no warranty or representations about the suitability of the software, documentation or learning material for any purpose. All of the data sets in the group can be referred to by a common name. It is provided “AS IS” without any expressed or implied warranty, including the implied warranties of merchantability, fitness for a particular purpose and non-infringement.

JCL – Defining Datasets

If any of the GDG versions are set with an expiration date which is yet to expire, then those are not deleted and hence the GDG base is retained. The model data only needs to be a VTOC entry and does not require disk space to be used.


The following JCL shows how: Permission to use, copy, modify and distribute this software, documentation or training material for any purpose requires a fee to be minframe to SimoTime Technologies. This means, all the generations within the GDG follow, the same record format, the same record length, the same block size etc. Notice the appended segment of GV00 on the data set name. If the attributes and organizations of all generations in a group are identical, the generations can be retrieved together as a single data set.

In a standardised JCL, the program to be executed and its related datasets are placed within a cataloged procedure, which is called in the JCL. International readers based in the US maifnrame other countries can click here to purchase the e-book. The documentation and software were developed and tested on systems that are configured for a SIMOTIME environment based on the hardware, operating systems, user requirements and security requirements.

These tables are provided for individuals that need to better understand the bit structures and differences of the encoding formats. We’ll also talk about the different people who work on a mainframe.

Concept Solutions Corporation: What are Generation Data Groups (GDG)

The preceding job that is described in Step 6 created an output file. There are two ways to do this. In the world of programming there are many ways to solve a problem. The Gnnnn is a generation number from to gdf the Vnn is a volume number from 00 to 99, this is typically If there is more than one dataset of the same format, they can be concatenated and passed as an input to the program in a ni DD name. If a user has a SimoTime Enterprise License the Documents and Program Suites may be available on a local server and accessed using the icon.


The preceding job that is described in Step 8 created an output file. Advantages to grouping related data sets include: The SimoTime name or Logo may not be used in any advertising or publicity pertaining to the use of the software without the written permission of SimoTime Technologies.

JCL referenced the GDG as a group the output file should have all six records each of the individual data sets associated with the GDG has two 2 records. Define a GDG Base. Explore An Enterprise System Model that describes and demonstrates how Applications that were running on a Mainframe System and non-relational data that was located gd the Mainframe System were copied and deployed in a Microsoft Windows environment with Micro Focus Enterprise Server.

GDG is created as the output. Here, we have kept limit as 3.

The two zeroes on the end of the name are used to represent a volume number that is used when the file is stored on media requiring the use of multiple volumes. The SimoTime Home Page. Following is the syntax:.

JCL, Execute the Jobs.

Therefore, adjustments may be needed to execute the jobs and programs when transferred to a system of a different architecture or configuration. Usually, for testing purposes or for an incident fix, there might be a need to use different datasets other than the ones specified in the cataloged procedure.

The latest versions of the SimoTime Documents and Program Suites are available on the Internet and may be accessed using the icon. What’s more, the books and manuals are incredibly hard to comprehend. Outdated or obsolete generations can be automatically deleted by the operating system. Demonstrate how to access generations individual files within a group. Please note that the dataset is referred as STEP1.

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