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What is a GDG? How is it referenced? How is it defined? What
is a MODELDSCB?
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GDG is Generation data groups to maintain versions of a
file.It can be daily, monthly or early. This will be
created using IDCAMS with no of version of the GDG.
MODELDSCB is the one we can use some other GDG as a model
to create a new GDG.
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