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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What is a GDG?

The document may be used assist as a tutorial for new programmers or as a quick reference for experienced programmers. Older data sets have smaller absolute numbers. 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 Credit-card holders dataset, stores their name, billing address, total credit limit, available balance, minimum amount due etc.

To create a GDG Model, we simply need to create an empty dataset, no space allocation, and bearing the DCB of the generations, you want to create.

If we update this dataset, to create the next generation, the generation number becomes GV The following is a summary of the jobs or JCL members included in this suite of programs and a typical process of execution and review. In that case, the dataset in the procedure can be overridden in the JCL. All of the data sets in the group can be referred to by a common name.

This suite of programs and documentation is available to download for review and evaluation purposes. The model data only needs to be a VTOC entry and does not require disk space to be used.

The GV00 has been deleted. What is GDG Model? A typical sequence of events is to submit the jobs described in Steps to Enterprise Server and then review the results.

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

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. The preceding job uses the IEFBR14 program a system supplied program that simply does a return to caller with a return code of zero in conjunction with a DD statement to create the model.


The DSN parameter refers to the physical dataset name of a newly created or existing dataset. To many people who are thrown to work at a mainframe computer on their first job, they feel lost.

The SimoTime name or Logo may not be used in gdv advertising or publicity pertaining to the use of the software without the written permission of SimoTime Technologies.

An EMPTY parameter specifies that when the limit is reached the three 3 current files will be deleted and the mainframme will start again with the new file. SimoTime Technologies shall not be liable for any direct, indirect, special or consequential damages resulting from the loss of mainfrrame, data or projects, whether in an action of contract or tort, arising out of or in connection with the use or performance of this software, documentation or training material.

Please note that the dataset is referred as STEP1.

JCL – Defining Datasets

Whether you want to use the Internet to expand into new market segments or as a delivery vehicle for existing business functions simply give us a call or check the web site at http: JCL, Execute the Jobs. New system-managed data sets are gg cataloged when allocated, with the volume assigned from a storage group.

What’s more, the books and manuals mainfrane incredibly hard to comprehend. This link requires an Internet Connection. The purpose of this suite of programs is to provide examples for creating and processing Generation Data Groups GDG’s.

Hence, the dataset is deleted when the job mainframs execution. Other uses will require a SimoTime Software License. Advantages to grouping related data sets include: The SimoTime Home Page. GDG 0previous versions are referred as -1-2 and so on.



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. This is called Backward Referencing. We’ll also talk about the different people who work on a mainframe. Following is the syntax:. There are two ways to do this. If the attributes and organizations of all generations in a group are identical, the generations or individual data sets may be retrieved together as a single data set.

Our customers include small businesses using Internet technologies to corporations using very large mainframe systems. International readers based in the US and other countries can click here to purchase the e-book.

When we want to maintain not only the current version of the file, but also previous versions, this calls for Generation Data Group GDG. That is, each data set is historically related to the others in the group. We have made a significant effort to ensure the documents and software technologies are correct and accurate.

Copyright IBM Corporation Rest all remains the same, just like we create an ordinary dataset. The Gnnnn is a generation number from to and the Vnn is a volume number from 00 to 99, this is typically Thus, we can access datasets within a GDG in 2 ways: Explore the Glossary of Terms for inn list of terms and definitions used in this suite of documents and white papers.

The input used by this suite of programs is generated within the programs. Delete a Generation Data Group. If you have any questions, suggestions, comments or feedback please call or send an e-mail to: Temporary datasets need storage only for the job duration and are deleted at job completion.