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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The preceding job should be used with caution. 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.

What is a GDG?

This document and the links to other documents are intended to provide a greater awareness of the Data Management and Application Processing alternatives.

The individual files within a group have a generation number added to the end of the name to make each file name unique. The purpose of this suite of programs is to provide examples for creating and processing Generation Data Groups GDG’s.

The preceding job that is described in Step 6 created an output file. Our customers include small businesses using Internet technologies to corporations using very large mainframe systems. 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.

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

If any of the GDG versions are set with an expiration mainframf which is yet to expire, then those are not deleted and hence the GDG base is retained. The maximum number of generations that you can associate with a base is Once the GV00 is reached the numbering will start again from GV The documentation and software were developed and tested on systems that are configured for a SIMOTIME environment based on the hardware, operating systems, user requirements and security requirements. Hence, the dataset is deleted when the job completes execution.

The intent is to provide changes as the need arises and in a timeframe that is dependent upon the availability of resources. We appreciate hearing from you. An Mainframd parameter specifies that when the limit is reached the three 3 current files will be deleted and the process will start again with the new file.


GDG 0previous versions are referred as -1-2 and so on. Outdated or obsolete generations can be automatically deleted by the operating system. Other uses will require a SimoTime Software License. JCL, Execute the Jobs. Following is the syntax:. A generation data group GDG base is allocated in a catalog before the generation data sets are cataloged.

Program Input and Output. 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.

For example, the data set name LAB. 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.

We have made a significant effort to ensure the documents and software technologies are correct and accurate. New system-managed data sets are always cataloged when allocated, with the volume assigned from a storage group. 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.

Explore the Glossary of Terms for a list of terms and definitions used in this suite of documents and white papers. Please note that the dataset is referred as STEP1. The latest versions of the SimoTime Documents and Program Suites are available on the Internet and may be accessed using the icon. Submit the jobs described in steps and review the results. A typical sequence of events is to submit the jobs described in Steps to Enterprise Server and then review the results. Process a Generation Data Group.

The Gnnnn is a generation number from to and the Vnn is a volume number from 00 to 99, this is typically This suite of programs and documentation is available to download for review and evaluation purposes. A SimoTime License is required for the items to be made available on a local system or server. 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.


Demonstrate how to access generations individual files within a group. Temporary datasets need storage only for the job duration and are deleted at job completion. A good place to start is The SimoTime Home Page for access to white papers, program examples and product information.

JCL – Defining Datasets

Malnframe the world of programming there are many ways to solve a problem. All of the data sets in the group can be mianframe to by a common name. GDG is created as the output. 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. 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.

What is a generation data group?

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.

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

Notice the appended segment of GV00 on the data set name. Delete a Generation Data Group. The data will need to be transferred between the systems and may need to be converted and validated at various stages within the mainfeame. Generation data sets have sequentially ordered absolute and relative names that represent their age.

GV00 and so on.

The relative name is a signed integer used to refer to the latest 0the next to the latest -1and so forth, generation.