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shekar123

Hai All,

I have a basic question in where in i have created a GDG and i want to make the first generation as empty ? Is it possible that after creating a GDG ,i can have an empty generation SHEKAR.TEST.GDG.G0001V00 without having a +1 submission job.
I came across a GDG where in there is no +1 GDG JCL to be created, but in the JCL i have seen refering to the current generation (0).Is it possible like that ? Please correct if i am in a wrong misconception ?
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Shekar
Grow Technically

kolusu · Posted: Thu Feb 23, 2006 5:55 am Post subject:

CaptObvious · Beginner Joined: 01 Feb 2006 Posts: 19 Topics: 1

A job that refers to generation (0) would just be reading the last generation. The confusion probably stems from the situation where you have a single jobstream that creates a new generation and then reads that as input in a later step. In those situations both steps need (+1) because the new generation isn't cataloged until the job ends. Any later job which needs that generation as input would be set to (0).

I'm not sure why you'd need an empty generation, though. If you're using GDG control correctly, that empty generation would roll off eventually, and you'd have to add a new one. And you'd have to hard-code the generation number in your JCL, or else you'd have to keep changing the generation number (-1, -2, -3, etc) every time a new generation is added to the group, to pick up the empty one. Wouldn't it be easier just to code a DD DUMMY? Or use an empty dataset which isn't a GDG?