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 jainframe system is able to keep the generations in chronological order. Temporary datasets need storage only for the job duration and are deleted at job completion. The operating system’s catalog management routines use the absolute generation name.

What is a GDG?

The Gnnnn is a generation number from to and the Vnn is a volume number from 00 to 99, this is typically What is GDG Model? SimoTime Technologies was founded in and is a privately owned company.

It is provided “AS IS” without any expressed or implied warranty, including the implied warranties of merchantability, fitness for a particular purpose and non-infringement.

GDG 0previous versions are referred as -1-2 and so on.

Quite often, to reach larger markets or provide a higher level of service to existing iin it requires the newer Internet technologies to work in a complementary manner with existing corporate mainframe systems. Delete Functions, Use with Caution. In a nutshell, we’ll de-mystify the mainframe. When technology complements business. 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: Therefore, adjustments may be needed to execute the jobs and programs when transferred to a system of a different architecture or configuration.

This section includes links to documents with additional information that are beyond the scope and iin of this document. Once the fee is received by SimoTime the latest version of the software, documentation or mainframd 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. The two gddg on the end of the name are used to represent a volume number that is used when the file is stored on tdg requiring the use of multiple volumes.


We reserve the right to make changes without notice at any time. The purpose of this suite of programs is to provide examples for creating and processing Generation Data Groups GDG’s. We’ll introduce you to the hardware and peripherals. The preceding job should be used with caution.

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

The following is a summary of the jobs or JCL members included in this suite of programs and a ggdg process of execution and review. 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.

The current generation is called Generation 0. The document may be used assist as a tutorial for new programmers or as a quick reference for experienced programmers. If we update this dataset, to create the next generation, the generation number becomes GV Software Agreement and Disclaimer. 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.

Maknframe there is more than one dataset of the same format, they can be concatenated and passed as an input to the program in a single DD name.

Generation Data Groups (GDG’s), an Introduction with Examples

The SimoTime name or Logo may mainframf be used in any advertising or publicity pertaining to the use of the software without the written permission of SimoTime Technologies. Usually, for testing purposes or for an incident fix, there might be a need to use different datasets other than bdg ones specified in the cataloged procedure. Kainframe 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 first group of maniframe may be available from a local system or via an internet connection, the second group of documents will require an internet connection. Thus, we can access datasets within a GDG in 2 ways: Older data sets have smaller absolute numbers. The SCRATCH parameter specifies that the oldest generation data set will be uncatalogued and deleted when the generation limit is exceeded.

The intent is to provide changes as the need arises and in a timeframe that is dependent upon the availability of resources. GV00 and so on. Here, we have kept limit as 3.

The program was tested using Micro Focus Net Express, version 5. Maknframe other words, we need to preserve the past historical data. Permission to use, copy, modify and distribute gddg software, documentation or training material for any purpose requires a fee to be paid to SimoTime Technologies. A SimoTime License is required for the items to be made ib on a local system or server. If the attributes and organizations of all generations in a group are identical, the generations can be retrieved together as a single data set.

These tables are provided for individuals that need to better understand the bit structures and differences of the encoding formats. What is a VTOC? Copyright IBM Corporation In that case, the dataset in the procedure can be overridden in the JCL.

We’ll talk about the operating system, the software installed on a mainframe.

Rest all remains the same, just like we create an ordinary dataset. Define a GDG Model. What if the customer mainframee a report which shows him, his Bank Account Statement of the last 6 months?