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 current generation is called Generation 0. This is called Backward Referencing. Explore the Glossary of Terms for a list of terms and malnframe used in this suite of documents and white papers. Hence, the dataset is deleted when the job completes execution. 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.

What is a VTOC? 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. We have made a significant effort to ensure the documents and software technologies are correct and accurate. The SimoTime Home Page. A good place to start is The SimoTime Home Page for access to white papers, program examples and product information.

There are two ways to do this. New system-managed data sets are always cataloged when allocated, with the volume assigned from a storage group. SimoTime Mainfgame makes no warranty or representations about the suitability of the software, documentation or learning material for any purpose.

That is, each data set is historically related to the others in the group.


The preceding job that is described in Step 6 created an output file. Advantages to grouping related data sets include: The function delivered in gd version is based upon the enhancement requests from a specific group of mqinframe. GDG 0previous versions are referred as -1-2 and so on.

The maximum number of generations that you can associate with a base is The operating system’s catalog management routines use the absolute generation name. The GV00 has been deleted.

What is a GDG?

GV00 and so on. We’ll introduce you to the hardware and peripherals. 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: 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.

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 means, all the generations within the GDG follow, the same record format, the same record length, the same block size etc.

A generation data group GDG base is allocated in a catalog before the generation data sets are cataloged. The DSN value can be made up of sub-names each of 1 to 8 characters length, separated by periods and of total length of 44 characters alphanumeric. The preceding job that is described maunframe Step 8 created an output file.

JCL – Defining Datasets

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. The following JCL shows how: Suppose, the Credit Card Accounts have been updated till the month of July. The latest versions of the SimoTime Documents and Program Suites are available on the Internet and may be accessed using the icon. Therefore, adjustments may be mxinframe to execute the jobs and programs when transferred to a system of a different architecture or configuration.


This document and the links to other documents are intended to provide a greater awareness of the Data Management and Application Processing alternatives. What is GDG Model? Temporary datasets need storage only for the job duration and are deleted at job completion. We specialize in preparing applications and the associated data that are currently residing on a single platform to be distributed across a variety of platforms.

This means, a maximum of 3 generations will be stored in the GDG. What’s more, the books and manuals are incredibly hard to comprehend. International readers based in the US and other countries can click here to purchase the e-book.

IBM Utilities Tutorial – 04 : Generation Data Group – GDG – Mainframes

In a nutshell, we’ll de-mystify the mainframe. Following is the syntax:.

Thus, we can access datasets within a GDG in 2 ways: The input used by this suite of programs is generated within the programs. Next, run the jobs described in Steps to create additional data sets. Copyright IBM Corporation This section includes links to documents with additional information that are beyond the scope and purpose of this document.