Difference between a version and generation in a GDG

deepak.vl · New User Joined: 17 Feb 2007 Posts: 38 Location: Hyderabad

Hi All,
Can anybody explain the difference between a version and generation in a GDG.

Thanks,
Deepak

William Thompson · Posted: Mon Feb 19, 2007 7:20 am

Go here....http://ibmmainframes.com/viewtopic.php?t=18056&highlight=difference+version+generation+gdg

mmwife · Super Moderator Joined: 30 May 2003 Posts: 1592

Hi Deepak,

AGeneration is used to reference one dataset of a Generation Data Group (GDG).

A Version is what most people with GDG questions posting here use to reference a Generation.

It's an inside joke. Actually, a Version references a different instance of the SAME Generation. For example, if you created a Generation - prod.myds.g0003V00 and found the data was in error, you could recreate the Generation with a new version number (G0003V01) and it would replace the Generation (G0003V00) with the erroneous data and keep the same place in the GDG as the original (V00). The system automatically deletes the old Version.

BTW, this is rarely used in practice, so check with your supervisor before attemping this.

deepak.vl · New User Joined: 17 Feb 2007 Posts: 38 Location: Hyderabad

Thanks mmwife.
But to create a version of a generation, how do we write a JCL? In other way, how do we create a different version of a generation, either manually or from JCL.

William Thompson · Posted: Sat Feb 24, 2007 10:40 pm

deepak.vl · New User Joined: 17 Feb 2007 Posts: 38 Location: Hyderabad

William Thompson · Posted: Sun Feb 25, 2007 12:59 am