Question
What is the main purpose of having user catalog in VSAM?
Answers
The user catalog consists of the lower hierarchy of the catalog, that contains the same structure as the master catalog. It is used to enhance the security of the user point of view and keeps all the files pointed towards the master files. The master catalog points to the user catalog that is defined and points to VSAM files. There is a possibility that user catalog can be represented in any number of instances rather than having only one instance like master catalog. The structure of VSAM is given such that if any link is deleted it will delete the master catalog as well. The affect will only be on the master catalog and the user catalogs won't be affected. If the user catalog is destroyed the file under the catalog will also be destroyed.   Your Comment




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