HP3000-L Archives

October 1999, Week 1

HP3000-L@RAVEN.UTC.EDU

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Subject:
From:
"Johnson, Tracy" <[log in to unmask]>
Reply To:
Johnson, Tracy
Date:
Wed, 6 Oct 1999 14:27:56 +0100
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text/plain (78 lines)
Concur, NM KSAM files don't crash.

I've worked on a totally NM KSAM application before,
the only related problem in regards to a crash is the
kind of problem you get in those cases where you have
multiple NM KSAM files open for a posting in the middle
of the crash.  i.e.:

What will happen is that some NM KSAM files will get posted
to and some others will not, depending where the application 
was at the nanosecond of the crash.  It becomes similar to 
the old problem of rollback or rollforward recovery for Image.
But the NM KSAM files will not be corrupted in themselves,
but may be out of sync with other ones that have a common
link or field as defined by the application.

(On a personal note this application wasn't the best I've
seen, but it was really cool in that I didn't need an 
Image tool to increase the data set sizes.  Just MPEX to
do an ALTFILE...)

> -----Original Message-----
> From: Tony Summers [mailto:[log in to unmask]]
> Sent: Wednesday, October 06, 1999 8:30 AM
> To: [log in to unmask]
> Subject: Re: Réf.[2]:_How_to_optimally_create _a_KSAM_file.
> 
> 
> NM files don't need KSAMUTIL recovery process after a crash, and I'm
> pretty sure XM maintains integrity.
> 
> >>> <[log in to unmask]> 06/10/99 12:24:14 >>>
> While we are on the topic of NM KSAM files, can anyone offer
> advice, suggestions etc. on a recovery procedure for NM KSAM
> files in the event of a system crash ?
> Does XM automatically guarantee the integrity of the index ?
> With CM KSAM files, it was standard procedure to run KSAMUTIL
> KEYINFO,RECOVER after a system failure.
> 
> TIA,
> 
> Tad.
> 
> 
> 
> From:     [log in to unmask] on 06/10/99 07:43 GMT
> 
> 
> Since no-one else has explicitly mentioned it, I would add 
> the following
> 
> don't forget to use NM Ksam rather than CM Ksam.
> 
> We found NM 30-40% faster !
> 
> 
> 
> 
> 
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