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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Preparing the application programs will require the transfer of source members that will be compiled and deployed on the target platform. Other uses will require a SimoTime Software License. In other words, we need to preserve the past historical data.

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

Readers based in Indiacan buy the e-book for Rs. Generation data sets have sequentially ordered absolute and relative names that represent their age. To many people who are thrown to work at a mainframe computer on their first job, mainframme feel lost. In a nutshell, we’ll de-mystify the mainframe. What’s more, the books and manuals are incredibly hard to comprehend.

Subsequent files are then named by incrementing the generation number resulting in filenames ending in GV00 through GV We specialize in the creation and deployment of business applications using new or existing technologies and services. The other way, we can access generations is by using relative referencing.


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

GV00, then it leads to changing the JCL every time before mainfram. This suite of programs and documentation is available to download for review and evaluation purposes. A generation data group GDG base is allocated in a catalog before the generation data sets are cataloged. Therefore, adjustments may be needed to execute the jobs and programs when transferred to a system of a different architecture or configuration.

If the attributes and organizations of all generations in a group are identical, the generations can be retrieved together as a single data set. 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.

What is a GDG?

The GV00 has been deleted. Software Agreement and Disclaimer.

The operating system’s catalog management routines use the absolute generation name. What if the customer wanted a report which shows him, his Bank Account Statement of the last 6 months? The DSN parameter refers to the physical dataset name of a newly created or existing dataset. 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 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. In a standardised JCL, the program to be executed and its related datasets are placed within a cataloged procedure, which is called in the JCL. GDG is created as the output.


For example, the data set name LAB. 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. Please note that the dataset is referred as STEP1.

JCL – Defining Datasets

The i is to provide changes as the need arises and in a timeframe that is dependent upon the availability of resources. A good place to start is The SimoTime Home Page for access to white papers, program examples and product information. We’ll also talk about the different people who work on a mainframe.

International readers based in the US and other countries can click here to purchase the e-book. Temporary datasets need storage only for the job duration and are deleted at job completion.

This is called Backward Referencing. Submit the jobs described in steps and review the results.

The preceding job that is described in Step 8 created an output file. 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.

New system-managed data sets are always cataloged when allocated, with the volume assigned from a storage group.