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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Program Input and Output. 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.

A typical sequence of events is to submit the jobs described in Steps to Enterprise Server and then review the results. Temporary datasets need storage only for the job duration and are deleted at job completion. The model data only needs to be a VTOC entry and does not require disk space to mainframme used. 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. 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 GDG?

The program was tested using Micro Focus Net Express, version 5. The following is a gdy of the jobs or JCL members included in this suite of programs and a typical process of execution and review. Other uses will require a SimoTime Vdg License.

The DSN value can be made up of sub-names each of 1 to 8 characters length, separated by periods and of total length of 44 characters alphanumeric. JCL, Execute the Jobs.

IBM MAINFRAME: Diff between a GDG and a dataset

These tables are provided for individuals that need to better understand the bit structures and differences of the encoding formats. Demonstrate how to access generations individual files within a group. GV00 and so on. Explore the Glossary of Terms for a list of terms and definitions used in this suite of documents and white papers.


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. 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.

Process a Generation Data Group. 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. 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.

Our customers include small businesses using Internet technologies to corporations using very large mainframe systems. An initial model DCB can be defined to be used by all versions, but it can mxinframe overridden when creating new versions.

Concept Solutions Corporation: What are Generation Data Groups (GDG)

The purpose of this suite of programs is to provide examples for creating and processing Generation Data Bdg GDG’s. This section includes links to documents with additional information that are beyond the scope and purpose of this document. New system-managed data sets are always cataloged when allocated, with the volume assigned from a storage group.

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.

Preparing the application programs will require the transfer of source members that will be compiled and deployed on the target platform. 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. 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.

Once the GV00 is reached the numbering will start again from GV GV00, then it leads to changing the JCL every time before execution. The GV00 has been deleted.


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

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 document may be used assist as a tutorial for new programmers or as a quick reference for experienced programmers. This link requires an Internet Connection. The Gnnnn is a generation number from to and the Vnn is a volume number from 00 to 99, this is typically Delete a Generation Data Group.

The operating system is able to keep the generations in chronological order.

An EMPTY 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. This is called Backward Referencing. If you have any questions, suggestions, comments or feedback please call or send an e-mail to: Next, run the mainframf described in Steps to create mainvrame data sets. Advantages to grouping related data sets include: The preceding job that is described in Step 8 created an output file.

JCL – Defining Datasets

The remaining generation data sets will be retained. 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.

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.

A good place to start is The SimoTime Home Page for access to white papers, program examples and product information. What is a VTOC? GDG is created as the output. The input used by this suite of programs is generated within the programs.