Post #1
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Sam
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Joined: Jul 1, 2026, 2:30 PM
Posted: Jul 30, 2026, 8:52 AM
Saw DSN=HLQ.DAILY.DATA(+1) and later (0) and (-1). Feels like versioning but I do not get the numbers.
Thread: JCL and JCL Utilities
What is a GDG? Why (+1) and (0)?
Started by Sam • user3 replies255 viewsLast activity 2 weeks ago
Post #2
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Jen
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Joined: Sep 3, 2024, 11:02 AM
Posted: Jul 30, 2026, 10:52 AM
GDG = generation data group. Same base name, many generations.
(+1) = new generation you are creating this run.
(0) = current (most recent cataloged) generation.
(-1) = previous one.
After the job catalogs (+1), that generation becomes the new (0) for the next job.
Post #3
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Bill
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Joined: Aug 28, 2024, 7:08 AM
Posted: Jul 31, 2026, 9:52 AM
LIMIT on the base controls how many gens are kept. Scratch vs noscratch is a whole other headache for later.
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