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.

Author: Zolozahn Nakasa
Country: Cape Verde
Language: English (Spanish)
Genre: Love
Published (Last): 7 April 2015
Pages: 197
PDF File Size: 10.78 Mb
ePub File Size: 17.10 Mb
ISBN: 411-9-18647-661-5
Downloads: 98979
Price: Free* [*Free Regsitration Required]
Uploader: Daikree

In that case, the dataset in the procedure can be overridden in the JCL. JCL, Execute the Jobs. Define a GDG Base. The following shows the catalog list from Enterprise Server. This document and the links to other documents are intended to provide a greater awareness of the Data Management and Application Processing alternatives.

If the attributes and organizations of all generations in a group are identical, the generations can be retrieved together as a single data set. 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 mainvrame requiring the use of multiple volumes.

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.

Whether you want to use the Internet to expand into new market segments or gddg a delivery vehicle for existing business functions simply give us a call or check the web site at http: 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.


What is a GDG?

Subsequent files are then named by incrementing the generation number resulting in filenames ending in GV00 through GV SimoTime Technologies makes no warranty or representations about the suitability of the software, documentation or learning material for any purpose.

What is a VTOC?

New system-managed data sets are always cataloged when allocated, with the volume assigned from a storage group. This section includes links to documents with additional information that are beyond the scope and purpose of this document. This suite of programs and documentation is available to download for review and evaluation purposes.

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. A good place to start is Mainvrame SimoTime Home Page for access to white papers, program examples and product information. Generation data sets have sequentially ordered absolute and relative names that represent their age.

Once the GV00 is reached the numbering will start again from GV The program was tested using Micro Focus Net Express, version 5. Following is the syntax:. The input used by this suite of programs is generated within the programs.

That is, each data set is historically related to the others in the group. Temporary datasets need storage only for the job duration and are deleted at job completion. An EMPTY parameter mainframf that when the limit is reached the three gdgg current files will be deleted and the process will start again with the new file.

Older data sets have smaller absolute numbers. GV00, then it leads to changing the JCL every time before execution.


In the world of programming there are many ways to solve a problem. Program Input and Output. The maximum number of generations that you can associate with a base is The model data only needs to be a VTOC entry and does not require disk space to be used. 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.

Explore the Glossary of Terms for a list of terms and definitions used in this suite of documents and white papers. The DSN value can be made up of sub-names maingrame of 1 to 8 minframe length, separated by periods and of total length of 44 characters alphanumeric.

JCL Defining Datasets

Submit mainftame jobs described in steps and review the results. SimoTime Technologies was founded in and is a privately owned company. 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. The remaining generation data sets will be retained.

We specialize in the creation and deployment of business applications using new or existing technologies and services. 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 to create the model.