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vin12pr
Warnings : 1
New User
Joined: 14 Jun 2006
Posts: 56
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I have a GDG with close to 1000 Generations. I want to retain only the 50 most recent generations i.e from 950 to 1000 and want to delete all the other generatins from 1 throughl 949. Is there any way to do this?
Vin |
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dick scherrer
Moderator Emeritus
Joined: 23 Nov 2006
Posts: 19244
Location: Inside the Matrix
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Hello,
You can do what you want with idcams. There are multiple examples in the forum. |
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Robert Sample
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Joined: 06 Jun 2008
Posts: 8697
Location: Dubuque, Iowa, USA
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I'm not sure what you're referring to, but you do not have a GDG with close to 1000 generations. From the IDCAMS manual on DEFINE GDG (emphasis added by me):
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15.1.1 Required Parameters
GENERATIONDATAGROUP
Specifies that a generation data group (GDG) entry is to be defined. A GDG can contain both SMS- and non-SMS-managed generation data sets. A generation data set (GDS) cannot be a VSAM data set. If you create a GDG and its catalog is on an SMS-managed volume, you should remove any dependencies on pattern DSCBs. See z/OS DFSMS Using Data Sets for information about GDGs and GDSs.
Abbreviation: GDG
NAME(entryname)
Specifies the name of the GDG being defined.
LIMIT(limit)
Specifies the maximum number, from 1 to 255, of GDSs that can be associated with the GDG being defined.
Abbreviation: LIM |
As the manual clearly states, a GDG has a maximum of 255 generations. You may have cataloged datasets that look like a GDG, but no more than 255 generations per GDG. Period. The other 700-odd datasets are not in the GDG. |
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gcicchet
Senior Member
Joined: 28 Jul 2006
Posts: 1702
Location: Australia
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Hi,
a quick and dirty way to delete the datasets attached to the GDG base (if limit is greater than 50), is to do an ALTER on the GDG base to 50, this will retain the last 50 GDG's and delete the remainder.
Gerry |
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dick scherrer
Moderator Emeritus
Joined: 23 Nov 2006
Posts: 19244
Location: Inside the Matrix
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Hello,
While you might have 1000 dataset names, they will not all be part of the active gdg (see Robert's reply).
Are these tape or dasd datasets? Have you verified that they all still exist? |
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expat
Global Moderator
Joined: 14 Mar 2007
Posts: 8797
Location: Welsh Wales
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And if you do a listcat do they appear either as "ROLLED OFF" or "DEFERRED" ?
Have you looked at your GDG definition to see if this causes the problem ? Maybe NOSCRATCH is defined in the GDG base.
Have you spoken to your storage people to do this process automatically via the ACS routines ? |
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