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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JCL – Defining Datasets

Subsequent files are then named by incrementing the generation number resulting in filenames ending in GV00 through GV Therefore, adjustments may be needed to execute the jobs and programs when transferred to a mxinframe of a different architecture or configuration.

The DSN ggd can be made up of sub-names each of 1 to 8 characters length, separated by periods and of total mainfra,e of 44 characters alphanumeric. For new non-system-managed data sets, if you do not specify a volume and the data set is not opened, the system does not catalog the data set. An initial model DCB can be defined to be used by all versions, but it can be overridden when creating new versions. Demonstrate how to access generations individual files within a group.

JCL Defining Datasets

The remaining generation data sets will be retained. If the attributes and organizations of all generations in a group are identical, the generations can be retrieved together vdg a single data set. This section includes links to documents with additional information that are beyond the scope and purpose of this document.

The preceding job that is described in Step 8 created an output file. 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. Permission to use, copy, modify and distribute this mainframee, documentation or training material for any purpose requires a fee to be paid to SimoTime Technologies.


When technology complements business. 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.

New system-managed data sets are always cataloged when allocated, with the volume assigned from a storage group. A typical sequence of events is to submit the jobs described in Steps to Enterprise Server and then review the results. Preparing the application programs will require the transfer of source members that will be compiled and deployed on the target platform. These tables are provided for individuals that need to better understand the bit structures and differences of the encoding formats.

This link requires an Internet Connection. GDG 0previous versions are referred as -1-2 and so on. The intent is to provide changes as the need arises and in a timeframe that is dependent upon the availability of resources.

SimoTime Technologies makes no warranty or representations about the suitability of the software, documentation or learning material for any purpose. Define a GDG Base. This document and the links to other documents are intended to provide a greater awareness of the Data Management and Application Processing alternatives.

Other uses will require a SimoTime Software License. Current Server or Internet Access. We have made a significant effort to ensure the documents and software technologies are correct and accurate. If there is more than one dataset of the same format, they maintrame be concatenated and gddg as an input to the program in a single DD name. Program Input and Output. 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.

A generation data group GDG base is allocated in a catalog before the generation data sets are cataloged.

What is a GDG?

The purpose of this suite of programs is to provide examples for creating and processing Generation Data Groups GDG’s. The maximum number of generations that you can associate with a base is The data will need to be transferred between the systems and may need to be converted and validated at various stages within the process. 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.


The preceding job that is described in Step 6 created an output file. 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. 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.

Once the GV00 is reached the numbering will start again from GV Copyright IBM Corporation 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: The function delivered in this version is based upon the enhancement requests from a specific group of users.

Usually, for testing purposes or for an incident fix, there might be a need to use different datasets other than the ones specified in the cataloged procedure. This is called Backward Referencing.


Explore An Enterprise Mainframw Model that describes and demonstrates how Applications that were running on a Mainframe System and non-relational data that was located on the Mainframe System were copied and deployed in a Microsoft Windows environment with Micro Focus Enterprise Server. Temporary datasets need storage only for the job duration and are deleted at job completion.

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