ALTERING GDG DEFINITION 5. DELETING GDG 6. IMPORTANT PRACTICAL QUESTIONS 1. INTRODUCTION Generation Data Groups or GDGs are a group. This facility is called Generation Data Groups (GDG). . There are two types of mainframe processes: Batch Processing Online Transaction Processing. JCL & VSAM: Hi all, I want to know the major difference between the dataset and GDG. reagrds akshatha.

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Demonstrate how to access generations individual files within a group.

If you have any questions, suggestions, mainnframe or feedback please call or send an e-mail to: Since the DSN name is the GDG name without an appended GnnnnVnn segment each of the individual data sets or files will be processed as a contiguous file starting with the last created data set.

Older data sets have smaller absolute numbers.

An EMPTY parameter specifies that when the limit is reached the three 3 current files will be deleted and the process will start again with the new file.

New system-managed data sets are always cataloged when allocated, with the volume assigned from a storage group. 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. The preceding job that is described in Step 6 created an output file. This document and the links to other documents are intended to provide a greater awareness of the Data Management and Application Processing alternatives.


Outdated or obsolete generations can be automatically deleted by the operating system. For example, the data set name LAB. Please note that the dataset is referred as STEP1. The remaining generation data sets will be retained.

What is a GDG?

The function delivered in this version is based upon the enhancement requests from a specific group of users. We reserve the right to make changes without notice at any time. The operating system’s catalog management routines use the absolute generation name.

The purpose of this suite of programs is to provide examples for creating and processing Aminframe Data Groups GDG’s. The individual files within a group have a generation number added to the end of the name to make each file name unique.

IBM MAINFRAME: Diff between a GDG and a dataset

GDG 0previous versions are referred as -1-2 and so on. The Gnnnn is a generation number from to and the Vnn is a volume number from 00 to mainfdame, this is typically These tables are provided for individuals that need to better understand the bit structures and differences of the encoding formats.

All of the data sets in the group can be referred to by a common mwinframe. Once the fee is received by SimoTime the latest version of the software, documentation or training material will be delivered and a license will be granted for use within an enterprise, provided the SimoTime copyright notice appear on all copies of the software.


This is called Backward Referencing.

Generation Data Groups (GDG’s), an Introduction with Examples

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 single DD name. The SCRATCH parameter specifies that the oldest generation data set will be uncatalogued and deleted when the generation limit is exceeded.

GDG is created as the output. The GV00 has been deleted. In the world of programming there are fdg ways to solve a problem.

This link requires an Internet Connection. For new non-system-managed data sets, if you do not specify a volume and the data set is not opened, the system does not catalog the data set. 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 on the Mainframe System were copied and deployed in a Microsoft Windows environment with Micro Focus Enterprise Server.

JCL – Defining Datasets

JCL, Execute the Jobs. The DSN mxinframe refers to the physical dataset name of a newly created or existing dataset. A SimoTime License is required for the items to be made available on a local system or server.