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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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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. Process a Generation Data Group. 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. 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.

Suppose, the Credit Card Accounts have been updated till the month of July.

The intent is to provide changes as the need arises and in a timeframe that is dependent upon the availability of resources. 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.

Delete Functions, Use with Caution. Define a GDG Model. This suite of programs and documentation is available to download for review and evaluation purposes. Software Agreement and Disclaimer.

Hence, the dataset is deleted when the job completes execution. Current Server or Internet Access. When technology complements business. The operating system’s catalog management routines use the absolute generation name. The preceding job that is described in Step 6 created an output file. Thus, we can mianframe datasets within a GDG in 2 ways: Please note that the dataset is referred as STEP1.


Generation Data Groups (GDG’s), an Introduction with Examples

The individual files within a group have a generation number added to the end of the name to make each file name unique. 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. Our customers include small businesses using Internet technologies to corporations using very large mainframe systems. Older data sets have smaller absolute numbers.

International readers based in the US and other countries can maunframe here to purchase the e-book. This is called Backward Referencing. We reserve the right to make changes without notice at any time. Other uses will require a SimoTime Software License.

What is a GDG?

A good place to start is The SimoTime Home Page for access to white papers, program examples and product information. Notice the appended segment of GV00 on the data set name.

How to access a particular generation? The GV00 has been deleted. There are two ways to do this. SimoTime Technologies was founded in and is a privately owned company.

What if the customer wanted a report which shows him, his Bank Account Statement of the last 6 months? 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.

JCL – Defining Datasets

The remaining generation data sets will be retained. In other words, we need to preserve the past historical data. The purpose of this suite of programs is to provide examples for creating and processing Generation Data Groups GDG’s.


The preceding job should be used with caution. SimoTime Technologies makes no warranty or representations about the suitability of the software, documentation or learning material for any purpose.

We’ll introduce you to the hardware and peripherals. Delete a Generation Data Group. A generation data group GDG base is allocated in a catalog before the generation data sets are cataloged. Submit the jobs described in steps and review the results. GV00 and so on. Therefore, adjustments may be needed to execute the jobs and programs when transferred to a system of a different architecture or configuration.

What is a VTOC? A SimoTime License is required for the items to be made available on a local system or server. Rest all remains the same, just like we create an ordinary dataset. GDG is created as the output. That is, each data set is historically related to the others in the group. We appreciate hearing from you. The relative name is a signed integer used to refer to the latest 0the next to the latest -1and so forth, generation.

Subsequent files are then named by incrementing the generation number resulting in filenames ending in GV00 through GV 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.