ALTERING GDG DEFINITION 5. DELETING GDG 6. IMPORTANT PRACTICAL QUESTIONS 1. INTRODUCTION Generation Data Groups or GDGs are a group. This facility is called Generation Data Groups (GDG). . There are two types of mainframe processes: Batch Processing Online Transaction Processing. JCL & VSAM: Hi all, I want to know the major difference between the dataset and GDG. reagrds akshatha.

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The individual files within a group have a generation number added to the end of the name to make each file name unique.

Subsequent files are then named by incrementing the generation number resulting in filenames ending in GV00 through GV Once the GV00 is reached the numbering will start again from GV 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.

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. We have made a significant effort to ensure the documents and software technologies are correct and accurate. We reserve the right to make changes without notice at any time.

The function delivered in this version is based upon the enhancement requests from a specific group of users. The intent is to provide changes as the need arises and in a timeframe that is dependent upon the availability of resources.

The input used by this suite of programs is generated within the programs. 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. A typical sequence of events is to submit the jobs described in Steps to Enterprise Server and then review the results.

JCL Defining Datasets

The Gnnnn is a generation number from to and the Vnn is a volume number from 00 to 99, this is typically Notice the appended segment of GV00 on the data set name.

Next, run the jobs described in Steps to create additional data sets. The following shows the catalog list from Enterprise Server. The preceding job that is described in Step 6 created an output file.

JCL referenced the GDG as a group the output file should have all six records each of ydg individual data sets associated with the GDG mainftame two 2 records.

Submit the jobs described in steps and review the results. The GV00 has been deleted. The preceding job that is described in Step 8 created an output file. The maximum number of generations that you can associate with mainfrxme base is The remaining generation data sets will be retained. An EMPTY parameter specifies that when the limit is reached the three 3 current files will be deleted and the process will start again with the new file.

Mainvrame SCRATCH parameter specifies that the oldest generation data set will be uncatalogued and deleted maibframe the generation limit is mainfraem. Before you create the files that attach to a GDG base you may want to create a model dataset that contains the DCB information for the files.


The model data only needs to be a VTOC entry and does not require disk space to be used. 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.

What is a GDG?

The preceding job should be used with caution. The program was tested using Micro Focus Net Express, version 5. The purpose of this suite of programs is to provide examples for creating and processing Generation Data Groups GDG’s.

The document may be used assist as a tutorial for new programmers or as a quick reference for experienced programmers. In the world of programming there are many ways to solve a problem.

This document and the links to other documents are intended to provide a greater awareness of the Data Management and Application Processing alternatives. 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. Therefore, adjustments may be needed to execute the jobs and programs when transferred to a system of a different architecture or configuration.

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These tables are provided for individuals that need to better understand the bit structures and differences of the encoding formats. This suite mainfraame programs and documentation is available to download for review and evaluation purposes. Other uses will require a SimoTime Software License.

A good place to start is The SimoTime Home Page for access to white papers, program examples and product information. This link requires an Internet Connection. Explore the Glossary of Terms for a list of terms tdg definitions used in this suite of documents and white papers. If you have any questions, suggestions, comments or feedback please call or send an e-mail to: SimoTime Technologies was founded in and is a privately owned company.

We specialize in the creation and deployment of business applications using new or existing technologies and services. We have a team of individuals that understand the gsg range of technologies being used in today’s environments. Our customers include small businesses using Internet technologies to corporations using very large mainframe systems.

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JCL, Execute the Jobs.

Define a GDG Base. Define a GDG Model. Process a Generation Data Group. Delete Functions, Use with Caution. Delete a Generation Data Group. Software Agreement and Disclaimer. Current Server or Internet Access.

JCL – Defining Datasets

The SimoTime Home Page. Demonstrate how to access generations individual files within a group. 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. When technology complements business.