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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Other uses will require a SimoTime Software License. Hence, the dataset is deleted when the job completes execution.

Temporary datasets need storage only for the job duration and are deleted at job completion. Bdg Input and Output. Process a Generation Data Group. 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.

What is a GDG?

A typical sequence of events is to submit the jobs described in Steps to Enterprise Maniframe and then review the results.

We have a team of individuals that understand the broad range of technologies being used in today’s environments. This document and the links to other documents are intended to provide a greater awareness of the Data Management and Application Processing alternatives.

This suite of programs and documentation is available to download for review and evaluation purposes. GV00, then it leads to changing the JCL every time before execution. A SimoTime License is required for the items to be made available on a local system or server. If 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. Submit the jobs described in steps and review the results. Maibframe good place to start is The SimoTime Home Page minframe access to white papers, program examples and product information.

Advantages to grouping related data sets include: We have made a significant effort to ensure the documents and software technologies are correct and accurate. GDG 0previous versions are referred as mainframee-2 and so on.

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

The Gnnnn is a generation number from to and the Vnn is a volume number from 00 to 99, this is typically 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.

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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 following is a summary of the jobs or JCL members included in this suite of programs and a typical process of execution and review. For example, the data set name LAB.

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.

The function delivered in this version is based upon the enhancement requests from a maijframe group of users. This section includes links to documents with additional information that are beyond the scope and purpose of this document.

The program was tested using Micro Focus Net Express, version 5. A generation data group GDG base is allocated in a catalog before the generation data sets are cataloged. For new non-system-managed data sets, if you do mainfdame specify a volume and the data set is not opened, the system does not catalog the data set.


The model data only needs to be a VTOC entry and does not require disk space to be used. Current Server or Internet Access. In a standardised JCL, the program to be executed and its related datasets are placed within a mainfframe procedure, which is called in the JCL.

Therefore, adjustments may be needed to execute the jobs and programs when transferred to a system of a different architecture or configuration. All of the data sets in the group can be referred to by a common name. The document may be used assist as a tutorial for new programmers or as a quick reference for experienced programmers.

If the attributes and organizations of all generations in a group are identical, the generations can be retrieved together as a single data set. We specialize in the creation and deployment of business applications using new or existing technologies and services. Explore the Glossary of Terms for a list of terms and definitions used in this suite of documents and white papers. Define a GDG Base. 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.


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. The remaining generation data sets will be retained. The SCRATCH parameter specifies that the oldest generation data set will be uncatalogued and deleted when the generation limit is exceeded. The SimoTime Home Page. Preparing the application programs gdh require the transfer of source members that will be compiled and deployed on the target platform.

Generation data sets have sequentially ordered absolute and mainrrame names that represent their age. 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. 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 mainfeame call or check the web site at http: Our customers include small businesses using Internet technologies to corporations using very large mainframe systems.

When technology complements business. In that case, the dataset in the procedure can be overridden in the JCL.

The following shows the catalog list from Enterprise Server. Copyright IBM Corporation GV00 and so on. SimoTime Technologies makes no warranty or representations about the suitability of the software, documentation or learning material for any purpose. The input used maunframe this suite of programs is generated within the programs. The latest versions of the SimoTime Documents and Program Suites are available on the Internet and may be accessed using the icon.