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Which is most effiecnt utility to copy VSAM to a tape PS

 
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Prosenjit001

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Joined: 02 Nov 2011
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PostPosted: Thu Nov 03, 2011 5:13 pm    Post subject: Which is most effiecnt utility to copy VSAM to a tape PS
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I am deleing with few jobs .. where lots of back and restore steps are present . Backup steps takes backup from VSAM to tape dataset and restore steps restore it from TAPE to VSAM .

Most of these steps are using IDCAMS , few are using IEBGENER or SORT .

All these steps are taking huge time to run .

Is the any other utility by which I can replace them inorder to increase the job effiency .
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Garry Carroll

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PostPosted: Thu Nov 03, 2011 5:26 pm    Post subject:
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You might try using ADRDSSU to dump these to tape.

Garry.
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vasanthz

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PostPosted: Thu Nov 03, 2011 5:26 pm    Post subject:
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Best is that you yourself have to run a test among the choices you have to determine which is effecient.

I once tested SORT,IDCAMS,IEBGENER,INSYNC,FILE MANAGER,ADRDSSU , at that time SORT was slightly faster than others.. It was only a crude analysis with EXCP, TCB & SRB values.
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dbzTHEdinosauer

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PostPosted: Thu Nov 03, 2011 5:28 pm    Post subject:
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they are all efficient.

are you looking for a utility that takes less elapsed time?
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expat

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PostPosted: Thu Nov 03, 2011 5:29 pm    Post subject:
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I'd probably go with Garry's suggestion as everything can be managed in one single DUMP step.

Also the product has great filtering capabilities.

Are you running a backup and restore as a matter of course. If so, why ?
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Prosenjit001

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PostPosted: Thu Nov 03, 2011 5:29 pm    Post subject:
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Thanks icon_smile.gif , let my try with ADRDSSU
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Ronald Burr

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PostPosted: Thu Nov 03, 2011 7:53 pm    Post subject:
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If you are currently doing a copy from VSAM to backup, followed by a delete/define of the VSAM file, followed by a copy from the backup in to the newly defined VSAM dataset, then I would suggest using the SORT product, not ADRDSSU.
A copyout/delete/define/copyin sequence will effectively re-org a VSAM KSDS dataset (e.g. eliminate CA/CI splits, reset free space); An ADRDSSU backup/restore will NOT perform such a re-org - it will restore the dataset just as it was before it was backed up.
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expat

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PostPosted: Thu Nov 03, 2011 8:52 pm    Post subject:
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Ronald, I think if you use logical rather than physical dump, then the reorg will occur on restore.
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Ronald Burr

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PostPosted: Thu Nov 03, 2011 9:14 pm    Post subject:
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True, but if the current process includes a DELETE/DEFINE between the backup and restore, then there would be a problem using ADRDSSU in the restore step, since no pre-allocation is required/supported by an ADRDSSU restore. The delete/define step was one of the "assumptions" in my IF...then... cautions.
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