explain in brief why do vsam take more disk space than other utilities?


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Why is it required to have a keyed directed retrieval?

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how do you create an alternate index ?

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what is the probability of a complete system distortion under high end low performing multiprocessor job?

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what are the idcams commands that can be used for vsam and explain each of them.

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in a cobol select statement, can you tell what is the organization for a ksds?

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what how do you initialize a vsam file before any operation? A vsam with alternate index?

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By seeing the file itself how can we identify whether it is A vsam file or flat file

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