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How to decompress a compressed KSDS file?


IBM Mainframe Forums -> JCL & VSAM
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manitonline

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Joined: 17 Sep 2005
Posts: 5
Location: Noida

PostPosted: Mon Nov 03, 2008 6:53 pm
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Hi,

I have a VSAM file which is in compressed format and is not mapping correctly to the layout copybook. Ineed to decompress it so that I can map it to the copybook.

Let em know how this can be done using FileAID or JCL?

Thanks
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expat

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Joined: 14 Mar 2007
Posts: 8794
Location: Welsh Wales

PostPosted: Mon Nov 03, 2008 7:23 pm
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Just REPRO the file to a flat file and SMS will automatically decompress it as it unloads.
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manitonline

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Joined: 17 Sep 2005
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PostPosted: Tue Nov 04, 2008 4:44 pm
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I am already doing the REPRO. The problem is that the COMP-3 fields in the file are being displayed as INVALID when i map the VSAM file to copybook using FileAID.

Also when my batch module tries to read these fields, it is abending with SOC7.

Kindly let me know why I am not able to view the packed COMP-3 fields correctly whicl other fields are comming correctly.
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expat

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PostPosted: Tue Nov 04, 2008 4:51 pm
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In browse mode, type HEX ON on the command line and all of those naughty little packed fields will become much more readable.
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agkshirsagar

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Joined: 27 Feb 2007
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PostPosted: Tue Nov 04, 2008 5:01 pm
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It is highly likely that you have invalid data in those fields.
It can also be a case where you may be using an older version of copybook for your mapping. I mean the copybook might have undergone some new changes.
File-aid takes care of displaying the comp-3 fields correctly so invalid data can be your problem.
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dick scherrer

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Joined: 23 Nov 2006
Posts: 19245
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PostPosted: Tue Nov 04, 2008 11:34 pm
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Hello,

How long ago was the data compressed and stored away?

When was the last time the copybook was modified?

If the data is "old" you will need to find/create a copybook that is the same layout as the data as Agkshirsagar suggested.

Looking at the data in HEX as Expat suggested will confirm whether the issue is layout or content.
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