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 relative name is a signed integer used to refer to the latest 0the next to the latest -1and so forth, generation. 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.

Explore the Glossary of Terms for a list of terms and definitions used in this suite of documents and white papers. Permission to use, copy, modify and distribute this software, documentation or training material for any purpose requires a fee to be paid to SimoTime Maunframe.

JCL – Defining Datasets

Please note that the dataset is referred as STEP1. Submit the jobs described in steps and review the results. 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.

Notice the appended segment of GV00 on the data set name.

Generation data sets have sequentially mqinframe absolute and relative names that represent their age. Delete Functions, Use with Caution. 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. Explore An Enterprise System 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.


For new non-system-managed tdg sets, if you mainframd not specify a volume and the data set is not opened, the system does not catalog the data set.

Software Agreement and Disclaimer. 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. This is called Backward Referencing. The remaining generation data sets will be retained. If you have any questions, suggestions, comments or feedback please call or send an e-mail to: Program Input and Output. Our customers include small businesses using Internet technologies to corporations using majnframe large mainframe systems.

IBM MAINFRAME: Diff between a GDG and a dataset

JCL, Execute the Jobs. Hence, the dataset is deleted when the job completes execution. Quite often, to reach larger markets or provide a higher level of service to existing customers it requires the newer Internet technologies to work in a complementary manner with existing corporate mainframe systems. Since the DSN name is the GDG nainframe 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.

For example, the data set name LAB.

What is a generation data group?

This suite of programs and documentation is available to download for review and evaluation purposes. A good place to start is Maincrame SimoTime Home Page for access to white papers, program examples and product information.

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

SimoTime Technologies makes no warranty or representations about the suitability of the software, documentation or learning material for any purpose. GV00, then it leads to changing the JCL every time before execution. 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. The operating system’s catalog management routines use the absolute generation name. 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 function delivered in this version is based upon the enhancement requests from a specific group of users. This section includes links to documents with additional information that are beyond the scope and purpose of this document.

What is a GDG?

These tables are provided for individuals that need to better understand the bit structures and differences of the encoding gvg. That is, each maintrame set is historically mainfeame to the others in the group. This document and the links to other documents are intended to provide a greater awareness of the Data Management and Application Processing alternatives. 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.

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. 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.