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

Other uses will require a SimoTime Software License. JCL, Execute the Jobs. We have a team of individuals that understand the broad range of technologies being used in today’s environments. The data will need to be transferred between the systems and may need to be converted and validated at various stages within the process.

The document may be used assist as a tutorial for new programmers or as a quick reference for experienced programmers.

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

Delete a Generation Data Group. The remaining generation data sets will be retained. Once the fee is received by SimoTime the latest version of the software, documentation or training material will be gxg 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 8 created an mmainframe file. For example, the data set name LAB.

Hence, the dataset is deleted when the job completes execution. 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. SimoTime Technologies makes no warranty or representations about the suitability of the software, documentation or learning material for any purpose.


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. 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. The SCRATCH parameter specifies that the oldest generation data set will be uncatalogued and deleted when the generation limit is exceeded.

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

What is a generation data group?

Permission to use, copy, modify and distribute this software, documentation or training material for any purpose requires maknframe fee to mainfrae paid to SimoTime Technologies. GDG 0previous versions are referred as -1-2 and so on. 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 Technologies was founded in and is a privately owned company.

Notice the appended segment of GV00 on the data set name. In the world of programming there are many ways to solve a problem.

The SimoTime Home Page. If you have any questions, suggestions, comments or feedback please call or send an e-mail to: 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. This suite of programs and documentation is available to download for review and evaluation purposes. 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 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.

When technology complements business.

What is a GDG?

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


In that case, the dataset in the procedure can be overridden in the JCL. Define a GDG Model. The Gnnnn is a generation number from to and the Vnn is a volume number from 00 to 99, this is typically Older data sets have smaller absolute numbers.

The model data only needs to be a VTOC entry and does not require disk space to be used. Demonstrate how to access generations individual files within a group. Before you create the files that attach to mainfgame GDG base you may want to create a model dataset that contains the DCB information for the files. GV00 and so on. We specialize in the creation and deployment of business applications using new or existing technologies and services.

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

JCL – Defining Datasets

We have made a significant effort to ensure the documents and software technologies are correct and accurate. Generation data sets have sequentially ordered absolute ,ainframe relative names that represent their age.

The relative name is a signed integer used to refer to the latest 0the next to the latest -1and so forth, generation. The latest versions of the SimoTime Documents and Gvg Suites are available on the Internet and may be accessed using the icon.

Once the GV00 is reached the numbering will start again from GV Preparing the application programs will require the transfer of source members that will be compiled and deployed on the target maifnrame. Please note that the dataset is referred as STEP1. Advantages to grouping related data sets include: The operating system is able to keep the generations in chronological order.