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Limit of GDG reached

 
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amar143

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Joined: 11 Nov 2010
Posts: 2
Location: India

PostPosted: Mon May 21, 2012 6:58 pm    Post subject: Limit of GDG reached
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If limit of GDG(255) reached and I want to create another 100 generations, How can i create that? And what will happen with older 255 generations.
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Robert Sample

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Joined: 06 Jun 2008
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Location: Bellevue, IA

PostPosted: Mon May 21, 2012 7:18 pm    Post subject:
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1. The theoretical limit of cataloged generations is 255 generations -- the actual limit will depend upon how the GDG was defined.
2. The actual generation number can go up to 9000 (i.e., G8999V00 is a valid generation number).
3. Assuing you created a GDG with LIMIT(255) and you add 100 generations, then the normal processing will occur -- the oldest 100 generations will be removed from the catalog (disposition depending upon a variety of factors, such as whether or not the GDG is SMS-managed, whether the GDG was defined with ERASE and so forth) and the new 100 generations will be in the catalog. The catalog would start with G0001V00 through G0255V00 and wind up with G0101V00 through G0355V00.

Since you seem completely and totally clueless about generation data groups, why don't you tell us the actual problem you THINK you have and let us help you clarify it?
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Peter cobolskolan

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Joined: 06 Feb 2012
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Location: Sweden

PostPosted: Mon May 21, 2012 7:50 pm    Post subject: Reply to: Limit of GDG reached
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You can use IDCAMS and ALTER to give the GDG a new LIMIT(), if the limit is incorrect, otherwise as Robert suggested.
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amar143

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PostPosted: Wed May 23, 2012 4:09 pm    Post subject: Reply to: Limit of GDG reached
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Thanks very much Robert for your clarification, There is no practical scenario I am facing with but According to theoretical description, I come to know that limit of GDG creation is 255 so I had that doubt. Now what will happen, if generations goes beyond 9000 (i.e., G8999V00 is a valid generation number).
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Robert Sample

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Location: Bellevue, IA

PostPosted: Wed May 23, 2012 4:44 pm    Post subject:
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amar143, this is NOT a manual reading service. Please find the JCL User's Guide (hint: there's a button at the top of THIS page that will let you review it) and read Appendix B on Generation Data Sets to find the answer to your question.
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Phrzby Phil

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Joined: 31 Oct 2006
Posts: 961
Location: Richmond, Virginia

PostPosted: Wed May 23, 2012 6:00 pm    Post subject:
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Or - Experiment!!

That's not just a chemistry exercise.

You might just become your site's expert. (Then you'll be cited.)
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Anuj Dhawan

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Joined: 22 Apr 2006
Posts: 6258
Location: Mumbai, India

PostPosted: Wed May 23, 2012 7:01 pm    Post subject:
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Quote:
Now what will happen, if generations goes beyond 9000
Don't hold your breath, you still have 999 to go! icon_biggrin.gif
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Pete Wilson

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Joined: 31 Dec 2009
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Location: London

PostPosted: Sat May 26, 2012 7:30 pm    Post subject:
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should we mention versions! icon_cry.gif

You'll find they go up to G9999V00 and then back to G0001V00 again. If you have both of those generation existing and you reference the (0) relative generation it would be to G0001V00 and G9999V00 would be (-1).
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