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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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. To many people who are thrown to work at a mainframe computer on their first job, they feel lost.

If the attributes and organizations of all generations in a group are identical, the generations can be retrieved together as a single data set. Suppose, the Credit Card Accounts have been updated till the month of July.

JCL Defining Datasets

Copyright IBM Corporation Hence, the dataset is deleted when the job completes execution. 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. What if the customer wanted a report which shows him, his Bank Account Statement of the last 6 months? 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: Preparing the application programs will require the transfer of source members that will be compiled and deployed on the target platform.

We appreciate hearing from you. A typical sequence of events is to submit the jobs described in Steps to Enterprise Server and then review the results. A good place to start is The SimoTime Home Page for access to white papers, program examples and product information.


When technology complements business. JCL, Execute the Jobs. The function delivered in this version is based upon the enhancement requests from a specific group of users. Our customers include small businesses using Internet technologies to corporations using very large mainframe systems.

In a nutshell, we’ll de-mystify the mainframe. GV00, then it leads to changing mainfrmae JCL every time before execution. There are two ways to do mainframr. Once the GV00 is reached the numbering will start again from GV Explore the Glossary of Terms for a list of terms and definitions used in this suite of documents and white papers. We’ll introduce you to the hardware and peripherals.

Demonstrate how to access generations individual files within a group. 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 specialize in preparing applications and the associated data that are currently residing on a single platform to be distributed across a variety of platforms.

The other way, we can access generations is by using relative referencing. How ,ainframe access a particular generation? The purpose of this suite of programs is to provide examples for creating and processing Generation Data Groups GDG’s. The Credit-card holders dataset, stores their name, billing address, total credit limit, available balance, minimum amount due etc. This means, a maximum of 3 generations will be stored in the GDG.

The following JCL shows how: In other words, mqinframe need to preserve the past historical data.

What is a GDG?

The data will need to be transferred between the systems and may need to be converted and validated at various stages within the process. If a user has a SimoTime Enterprise License the Documents and Program Suites may be available on a local server and accessed using the maonframe.


A generation data group GDG base is allocated in a catalog before the generation data sets are cataloged. Generation data sets have sequentially ordered absolute and relative names that represent their age. Thus, we can access datasets within a GDG in 2 ways: Program Input and Output. Please note that the dataset is referred as STEP1. It is provided “AS IS” geg any expressed or implied warranty, including the implied warranties of merchantability, fitness for a particular purpose mainnframe non-infringement.

SimoTime Technologies was founded in and is a privately owned company. This is called Backward Referencing.

If you have any questions, suggestions, comments or feedback please call or send an e-mail to: Older data sets have smaller absolute numbers. This suite of programs and documentation is available to download for review and evaluation purposes. Advantages to grouping related data sets include: The relative name is a signed integer used to refer to the latest 0the next to the latest -1and so forth, generation. In the world of programming there are many ways to solve a problem. What is GDG Model?

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 operating system’s catalog management routines use the absolute generation name.

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.

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