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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This suite of programs and documentation is available to download for review and evaluation purposes. The Gnnnn is a generation number from to and the Vnn is a volume number from 00 to 99, this is typically If there is more than one dataset of the same format, they can be concatenated and passed mainfrwme an input to the program in a single DD name.

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.

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

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. Advantages to grouping related data sets include: When technology complements business. The DSN parameter refers maiinframe the physical dataset name of a newly created or existing dataset.

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 maainframe create the model.

The model data only needs to be a VTOC entry and does not require disk space to be used. Current Server or Internet Access.

GV00 and so on. Process a Generation Data Group. The preceding job that is described in Step 6 created an output file.


All of the data sets in the group can be referred to by a common name. 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. In a standardised JCL, the program to be executed and its related datasets are placed within a cataloged procedure, which is called in the JCL.

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. The input used by this suite of programs is generated within the programs.

JCL Defining Datasets

The data will need to be transferred between the systems and may need to be converted and validated at various stages within the process. Preparing the application programs will require the transfer of source members that will be compiled and deployed on the target platform.

Older data sets have smaller absolute numbers. Hence, the dataset is deleted when the job completes execution. 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. A good place to start is The SimoTime Home Page for access to white papers, program examples and product information.

JCL – Defining Datasets

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. Submit the jobs described in steps and review the results. This section includes links to documents with additional information that are beyond the scope and purpose of this document.


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.

The following shows the catalog list from Enterprise Server.

Notice the appended segment of GV00 on the data set name. Subsequent files are then named by incrementing the generation number resulting in filenames ending in GV00 through GV The first group of documents may be available from a local system or via an internet connection, the second group of documents will require an internet connection. 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 operating system is able to keep the generations in chronological order. We specialize in the creation and deployment of business applications using new or existing technologies and services.

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.

If any mainframd 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. We have a team of individuals that understand the broad range of technologies being used in today’s environments. JCL, Execute the Jobs. Copyright IBM Corporation ,