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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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. Temporary datasets need storage only for the job duration and are deleted at job completion.

Define a GDG Model. A SimoTime License is required for the items to be made available on a local system or server. For example, the data set name LAB. 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.

Other uses will require a SimoTime Software License. The following is a summary of the jobs or JCL members included in this suite of programs and a typical process of execution and review. The latest versions of the SimoTime Documents and Program Suites are available on the Internet and may be accessed using the icon. The function delivered in this version is based upon the enhancement requests from a specific group of users. 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.

The SCRATCH parameter specifies that the oldest generation data set will be uncatalogued and deleted when the generation limit is exceeded. The maximum number of generations that you can associate with a base is Delete Functions, Use with Caution. This link requires an Internet Connection.


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The GV00 has been deleted.

The preceding hdg that is described in Step 6 created an output file. The purpose of this suite of programs is to provide examples for creating and processing Generation Data Groups GDG’s.


That is, each data set is historically related to the others in the group. The program was tested using Micro Focus Net Express, version 5. Program Input and Output. The relative name is a signed integer used to majnframe to the latest 0the next to the latest -1and so forth, generation. 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.

Notice the appended segment of GV00 on the data set name. We have made a significant effort to ensure the documents and software technologies are correct and accurate. Submit the jobs described in steps and review the results.

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.

Next, run the jobs described in Steps to create additional data sets.


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 model data only needs to be a VTOC entry and does not require disk space to be used. SimoTime Technologies makes no warranty or representations about the suitability of the software, documentation or learning material for any purpose. 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 mainframee the web site at http: The SimoTime Home Page.

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

A gsg place to start is The SimoTime Home Page for access to white papers, program examples and product information. Subsequent files are then named by incrementing the generation number resulting in filenames ending in GV00 through GV 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. SimoTime has the technology, services and experience to assist in the application and data management tasks involved with doing business in a multi-system environment.

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.

This section includes links to documents with additional information that are beyond the scope and purpose of this document.

The Gnnnn is a generation number from to and the Vnn is a volume number from 00 to 99, this is typically