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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International readers based in the US and other countries can click here to purchase the e-book. Mainframe people seem to speak a completely different language and that doesn’t make life easy.

The SimoTime Home Page. This document and the links to other documents are intended to provide a greater awareness of the Data Management and Application Processing alternatives.

The Credit-card holders dataset, stores their name, billing address, total credit limit, available balance, minimum amount due etc. SimoTime Technologies shall not be liable for any direct, indirect, special or consequential damages resulting from the loss of use, 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.

The document may be used assist as a tutorial for new gdf or as a quick reference for experienced programmers. Please note that the dataset is referred as STEP1. Permission to use, copy, modify and distribute this software, documentation or training material for any purpose requires gg fee to be paid to SimoTime Technologies.

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

We appreciate hearing from you. The latest versions of the SimoTime Documents and Program Suites are available on the Internet and may be accessed using the icon.


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. In a standardised JCL, the program to be executed and mainfrake related datasets are placed within a cataloged procedure, which is called in the JCL. When we want to maintain not i the current version of the file, but also previous versions, this calls for Generation Data Group GDG.

What is a GDG?

This link requires an Internet Connection. All of the data sets in the group can be referred to by a common name. Following is the syntax:. Hence, the dataset is deleted when the job completes execution.

This means, all the generations within the GDG follow, the same record format, the same record length, the same block size etc. Submit the jobs described in steps and 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.

Rest all remains the same, just like we create an ordinary dataset. Mainnframe how to access generations individual files within a group. The GV00 has been deleted. 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. Explore the Glossary of Terms for a list of terms and definitions used in this suite of documents and white papers.

We reserve the right to make changes without notice at any time. When technology complements business. Delete a Generation Data Group.

What is a generation data 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. 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. Readers based in Indiacan buy the e-book for Rs. Thus, we can access datasets within a GDG in 2 ways: 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.


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.

We have a team of individuals that understand the broad range of technologies being used in today’s environments. What is GDG Model? Preparing the application programs will require the transfer of source members that will be compiled and deployed on the target platform. Copyright IBM Corporation The SCRATCH parameter specifies that the oldest generation data set will be uncatalogued and deleted when the generation limit is exceeded. Outdated or obsolete generations can be automatically deleted by the operating system.

Suppose we have stored a large amount of data of all credit-card holders in a Sequential Dataset. The individual files within a group have a generation number added to the end of the name to make each file name unique. How to access a particular generation? In the world of programming there are many ways to solve a problem.

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. In other words, we need to preserve the past historical data.

A good place to start is The SimoTime Home Page for access to white papers, program examples and product information. We specialize in the creation and deployment of business applications using new or existing technologies and services. A typical sequence of events is gdf submit the jobs described in Steps to Enterprise Server and then review the results.