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This is an example of a COBOL program and JCL that will create and process a Generation Data Group or GDG on a Mainframe System with ZOS or a Linux. Generation Data Groups (GDGs) are group of datasets related to each other by a common name. The common name is referred as GDG base and each dataset. 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

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 data in the Credit-card holder file has to be updated every to reflect the purchases and payments made by the card-holder. What if the customer wanted a report which shows him, his Bank Account Statement of the last 6 months? New system-managed data sets are always cataloged when allocated, with the volume assigned from a storage group.

The individual files within a group have a generation number added to the end of the name to make each file name unique. GDG is created as the output. The latest versions of the SimoTime Documents and Program Suites are available on the Internet and may be accessed using the icon. Generation data sets have sequentially ordered absolute and relative names that represent their age.

Older data sets have smaller absolute numbers. We’ll talk about the operating system, the software installed on a mainframe. The following shows the catalog list from Enterprise Server.


To create a GDG Model, we simply need to create an empty dataset, no space allocation, and bearing the DCB of the generations, you want to create.

We appreciate hearing from you. Here, we have kept limit as 3. The relative name is a signed integer used to refer to the latest 0the next to the latest -1and so forth, generation.

Current Server or Internet Access. What is a VTOC? SimoTime Technologies shall not be liable for any direct, indirect, special or consequential damages resulting from the loss of use, data or projects, whether in an action of contract or tort, arising out of or in connection with the use or performance of this software, documentation or training material. In other words, mainfame need to preserve the past historical data.

Next, run the jobs described in Steps to create additional data sets. Thus, we can access datasets within a GDG in 2 ways: Whether you want to use the Internet to expand into new market segments or as a delivery vehicle for existing business functions simply maainframe us a call or check the web site at http: GV00 and so on.

The preceding job that is described in Step 8 created an output file.

IBM MAINFRAME: Diff between a GDG and a dataset

Subsequent files are then named by incrementing the generation number resulting in filenames ending in GV00 through GV The current generation is called Generation 0.

Therefore, adjustments may be needed to execute the jobs and programs when transferred maihframe a system of a different architecture or configuration. The documentation and software were developed and tested on systems that are configured for a SIMOTIME bdg based on the hardware, operating systems, user requirements and security requirements.

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


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. Define a GDG Base.

What is a GDG?

Our customers include small businesses using Internet technologies to corporations using very large mainframe systems. For example, the data set name LAB. The document may be used assist as a tutorial for new programmers or as a quick reference for experienced programmers.

When we want to maintain not only the current version of the file, but also previous versions, this calls for Generation Data Group GDG. Again, for the next generation, the generation number will be GV00, and so on For new non-system-managed data sets, if you do not specify a volume and the data set is not opened, the dgg does not catalog the data set.

This link requires an Internet Connection. Permission to use, copy, modify and distribute this software, documentation or training material for any purpose requires a fee to be paid to SimoTime Technologies. What’s more, the books and manuals are incredibly hard to comprehend.

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.