W dniu 2011-10-26 12:09, Thomas Berg pisze:
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Från: IBM Mainframe Discussion List [mailto:[email protected]] För
Robert A. Rosenberg
Skickat: den 26 oktober 2011 07:27
Till: [email protected]
Ämne: Re: GDG
At 14:52 -0700 on 10/25/2011, Steve Thompson wrote about Re: GDG:
Do you actually mean version or generation? I ask this because now
and then someone actually means version (rarely). And what you asked
could be either.
Version will be A.B.C.G0001V00 then A.B.C.G0001V01.
Generation will be A.B.C.G0001V00 then A.B.C.G0002V00
This makes a big difference in what you will have to do!!
Note that when you create and catalog A.B.C.G0001V01 it will replace
A.B.C.G0001V00 as A.B.C(n) - IOW: If after A.B.C.G0002V00 was created
A.B.C.G0001V00 would be A.B.C(-1). Creating A.B.C.G0001V01 at this
point would make IT A.B.C(-1) and A.B.C.G0001V00 would no longer be
cataloged (it would be handled just like a generation that rolled off
the GDG base.
The purpose of creating a GxxxxVyy (where yy is NOT 00) is to replace
the V00 (or current) version. This might occur if you want move the
file from one media to another while leaving it in the GDG chain.
By curiosity, how do You specify version in the JCL ?
I mean in the same way we specify latest generation by aaa(0)
and a new by aaa(+1) etc.
You specify DSN=HLQ.GDGBASE.G0008V01,DISP=(,CATLG)
It will REPLACE HLQ.GDGBASE.G0008V00 - the older version will be deleted.
Actually you can specify V07 jsut after V00, or even V03 after V07. In
any case the newest version will be kpet, despite of the version number.
BTW: IMHO moving from one media to another is bad example. It can be
done by using DSS COPY with TGTGDS option.
Versions are for unsuccesful job runs. You can rerun the job and create
another version.
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