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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A SimoTime License is required for the items to be made available on a local system or server. Before you create the files that attach to a GDG base you may gddg to create a model dataset that contains the DCB information for the files.

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

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Delete Functions, Use with Caution. SimoTime has the technology, services and experience to assist in the application and data management tasks involved with doing business in a multi-system environment.

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JCL Defining Datasets

SimoTime Technologies makes no warranty or representations about the suitability of the software, documentation or learning material for any purpose. New system-managed data sets are always cataloged when allocated, with the volume assigned from a storage group. Once the GV00 is reached the numbering will start again from GV Next, run the jobs described in Steps to create additional data sets.


The DSN parameter refers to the physical dataset name of a newly created or existing dataset. We specialize in the creation and deployment of business applications using new or existing technologies and services. Temporary datasets need storage only for the job duration and are maimframe at job completion.

These tables are provided for individuals that need to better understand the bit structures and differences of the encoding formats. Demonstrate how to access generations individual files within a group. The operating system is able to majnframe the generations in chronological order. A generation data group GDG base is allocated in a catalog before the generation data sets are cataloged. 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.

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.

What is a GDG?

The operating system’s catalog management routines use the absolute generation name. In the maindrame of programming there are many ways to solve a problem. GV00 and so on.

The intent is to provide changes as the need arises and in a timeframe that is dependent upon the availability of resources.

The individual files within a group have a generation number added to the end of the name to make each file name unique.

JCL – Defining Datasets

The SimoTime name or Logo may not mainfrme used in any advertising or publicity pertaining to the use of the software without the written permission of SimoTime Technologies. We reserve the right to make changes without maainframe at any time. Explore the Glossary of Terms for a list of terms and definitions used in this suite of documents and white papers.


A typical sequence of events is to submit the jobs described in Steps to Enterprise Server and then review the results. 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.

Generation data sets have sequentially ordered absolute and relative names that represent their age. Subsequent files are then named by incrementing the generation number resulting in filenames ending in GV00 through GV The GV00 has been mainfrake.

The model data only needs to be a VTOC entry and does not require disk space to be used.

Hence, the dataset is deleted when the job completes execution. This suite of programs and documentation is available to download for review and evaluation purposes. We have made a significant effort to ensure the documents and software technologies are correct and accurate.

We appreciate hearing from you. Delete a Generation Data Group. This document and the links to other documents are intended to provide a greater awareness of the Data Management and Application Processing alternatives.

This link requires an Internet Connection. What is a VTOC? GDG is created as the output.