[Isis-users] Issue of suddenly increasing the file size of N01

[Anusha Yapa]

Dear Werner,
 
I'm using 3 terminals with write access. Hence I'll verify the SYSPAR.PAR file as well.
I'll follow your steps and will let you know the results.
 
Appreciate your guidance.
Anusha.
 

--- On Wed, 2/23/11, Werner Hillebrecht <whillebrecht at mec.gov.na> wrote:


From: Werner Hillebrecht <whillebrecht at mec.gov.na>
Subject: Re: [Isis-users] Issue of suddenly increasing the file size of N01
To: isis-users at iccisis.org
Date: Wednesday, February 23, 2011, 1:53 AM


Dear Anusha, 

I can confirm Piet's advice. I had the same problem just a week ago,
noticing the huge N01 file when a backup was taking much longer than usual.
It was a single corrupted record that caused the problem. When exporting the
database, the export stopped at the MFN before the bad record (for example
12356). By viewing the next MFN 12357, one could see that it was corrupted.
After checking that the following MFN was ok, I exported the rest of the
records from 12358 to the end (of course with a different filename of the
ISO file). Then I created an empty copy of the database and imported the two
exports. After a new indexing run, the N01 file was normal. I could then
also replace the corrupted record from an earlier backup of the database.
For cases like this, it is useful to keep some old backups.

We had another such case some years ago, when several records at different
places got corrupted and I had to export the data in six or seven batches to
restore the database. In that case, we could trace the cause of the bad
records to one networked computer where the SYSPAR.PAR parameter 14 was
wrongly set to single-user access. There can probably be other causes, but
you should better check on your network for that parameter if you have more
than one terminal with writing access.

Werner Hillebrecht
National Archives of Namibia
P/Bag 13250, Windhoek, Namibia
No.1 Eugene Marais Street
Tel +264-61-2935211 / 5204
Fax +264-61-2935217 


-----Original Message-----
From: isis-users-bounces at iccisis.org [mailto:isis-users-bounces at iccisis.org]
On Behalf Of Piet De Keyser
Sent: 23 February 2011 09:14
To: isis-users at iccisis.org
Subject: Re: [Isis-users] Issue of suddenly increasing the file size of N01

Hi Anusha,

I have seen this a few years ago. Try to secure your data by exporting 
them in small quantities (e.g. 1000 records a one time). You will crash 
on some bad records in doing so; skip that section. After this you need 
to start from a clean database. Import your data in that clean one. You 
could also try to fix the XRF of the database using MSTRCV2 
(downlaodable from the Unesco Isis utilities site).

Piet de Keyser
Belgium

Citeren Anusha Yapa <anusha_yapa at yahoo.com>:

>
> Hello,
> I?m using WinISIS version 1.5. I recently faced an issue of suddenly 
> increasing the file size of N01. Normally this file having size below 
> 10Kb. But this time it reached up to 5GB. I was tried with importing 
> same data to new DB. But again faced same issue. I?m having around 
> 30000 records.
> Did anyone face similar issue.
> What is the permanent solution for this.
> Is this occurring due to data issue.
>  
> Appreciate you guidance
> Anusha.
>
>
>
>


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