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Related to GDG versions creations


IBM Mainframe Forums -> JCL & VSAM
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sivareddy123

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Joined: 14 Jan 2015
Posts: 11
Location: India

PostPosted: Tue Jan 20, 2015 11:14 am
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There is a JCL which has five steps.

Step 1:

It uses the GDG(0) as input and creates another GDG version.

INPUT - GDG(0)
OUTPUT- GDG version created by step 1

Step 2:

It uses the output of step 1 as input and creates another GDG version.

INPUT - output GDG version created by step 1
OUTPUT - GDG version created by step 2

Step 3:

It uses the GDG output created by step 2 as input and creates another GDG version.

INPUT - GDG version created by Step 2
OUTPUT - GDG version created by step 3

Step 4;It uses the GDG output created by step 3 as input and creates another GDG version.

INPUT - GDG version created by Step 3
OUTPUT - GDG version created by step 4

Step 4;It uses the GDG output created by step 4 as input and creates another GDG version.

INPUT - GDG version created by Step 4
OUTPUT - GDG version created by step 5

If job got abend in step 2 then what is input and output for step 2, step 3, step 4 and step 5

First question:

What are the version numbers used and created by each step?

"; ; ; ;
Second Question:

If JCL abends inexecution of Step 2, and needs to be restarted from Step 3, are there
any changes required in the GDG version numbers
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Nic Clouston

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Joined: 10 May 2007
Posts: 2455
Location: Hampshire, UK

PostPosted: Tue Jan 20, 2015 1:12 pm
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The version number is whatever you specify in your JCL as it is not maintained automatically unlike the generation number. Why not read the JCLuser guide and set up a test GDG base that you can play with and try out your scenarios?
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David Robinson

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Joined: 21 Dec 2011
Posts: 198
Location: UK

PostPosted: Tue Jan 20, 2015 2:20 pm
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Is this an interview question? It doesn't sound like a real requirement.
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sivareddy123

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Joined: 14 Jan 2015
Posts: 11
Location: India

PostPosted: Tue Jan 20, 2015 2:26 pm
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Hello David ,

Thanks for your reply!!

Yes ,Its interview question
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David Robinson

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Joined: 21 Dec 2011
Posts: 198
Location: UK

PostPosted: Tue Jan 20, 2015 2:54 pm
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Obviously a trick question. As Nic has said, the version number will always be V00 unless your JCL specifies anything different.

I expect the interviewer is testing you to make sure you know the difference between generations and versions.
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Pete Wilson

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Joined: 31 Dec 2009
Posts: 500
Location: London

PostPosted: Thu Jan 22, 2015 6:36 pm
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If the steps are within a job the output GDG's relative 'generation' number increments by one each time, so step1 is (+1), step2 is (+2) and so on.

And the inputs would be (0) in the first step, (+1) in the second (+2) in the third and so on.

And as Nic said, 'version' numbers do NOT change unless you specifically do that yourself, which no-one really does as it's a fairly pointless thing to do.
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