The advantages of GDG are.....
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It will maintain all generation of data sets
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It will catalog older generation files
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No need of change the JCL every time when we submit.
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None of these
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AI explanation
Generation Data Groups (GDGs) let a mainframe program reference a rolling set of related datasets (e.g., daily backups) collectively, automatically maintaining all the generations under one base name. Because JCL can reference a GDG by relative generation number (like +1 or 0), you don't need to edit the JCL each time a new generation is created, which is the main operational advantage.