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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. Program Processing Overview A typical sequence of events is to submit the jobs described in Steps to Enterprise Server and then review the results.
The Gnnnn is a generation number from to and the Vnn is a volume number from 00 to 99, this is typically Notice the appended segment of GV00 on the data set name. The following shows the catalog list from Enterprise Server.
JCL referenced the GDG as a group the output file should have all six records each of the individual data sets associated with the GDG has two 2 records. Submit the jobs described in steps and review the results. The GV00 has been deleted. The maximum number of generations that you can associate with a base is The remaining generation data sets will be retained.
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. The SCRATCH parameter specifies that the oldest generation data set will be uncatalogued and deleted when the generation limit is exceeded.
The model data only needs to be a VTOC entry and does not require disk space to be used. The preceding job should be used with caution. The program was tested using Micro Focus Net Express, version 5.
TXT file as input. This is a sequential load process. The version control number is The document may be used assist as a tutorial for new programmers or as a quick reference for experienced programmers. In the world of programming there are many ways to solve a problem.
This document and the links to other documents are intended to provide a greater awareness of the Data Management and Application Processing alternatives. 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.
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What is a generation data group? That is, each data set is historically related to the others in the group. If the attributes and organizations of all generations in a group are identical, the generations can be retrieved together as a single data set. Advantages to grouping related data sets include: All of the data sets in the group can be referred to by a common name. The operating system is able to keep the generations in chronological order. Outdated or obsolete generations can be automatically deleted by the operating system. Generation data sets have sequentially ordered absolute and relative names that represent their age.
GDG in JCL
The DSN parameter refers to the physical dataset name of a newly created or existing dataset. 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. This is called Backward Referencing. Concatenating Datasets 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. Overriding Datasets 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. Usually, for testing purposes or for an incident fix, there might be a need to use different datasets other than the ones specified in the cataloged procedure.