Multiple choice technology mainframe What is the maximum no of generations you can have in a GDG a) 15 b) 255 c) 2056 d) 6046 Reveal answer Fill a bubble to check yourself B Correct answer Explanation In standard z/OS JCL, the maximum number of generations that could historically be defined in a Generation Data Group (GDG) limit is 255. Although newer DFSMS releases allow up to 999 generations, 255 remains the standard classic limit.