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Re: Poor perfmance after large delete

From: <andrew.nelson_at_astramerck.com>
Date: 1997/04/22
Message-ID: <861738934.30580@dejanews.com>#1/1

In article <4167cd$a52d.28d_at_mail.prodv.de>,   baumkoetter_at_prodv.de wrote:
>
>
> mwagoner_at_iac.net (Mark Wagoner) wrote:
>
> >We had been testing our database setup with sample data and decided to try
> >and go live. The main table had 1.4 million rows, which I deleted by doing
> >a series of DELETE FROM WHERE statements (I tried to truncate the table,
> >but Oracle said there were constraints even after I disabled them all, but
> >that is another problem). After about 2 hours the main tables were empty
> >so I went in and did a SELECT COUNT(*) to make sure. It took almost 3
> >minutes for the result to come back! It took less than 2 seconds when the
> >table was full!
>
> [some stuff deleted]
>
> Hello Mark,
>
> we have the same problem. Oracle told us that the internal hashing
> tables are cleared but the memory is still in use. That makes the
> things slow down.
>
> The only solution we've found ist to drop the table and then recreate
> it. But to do this you have to drop and recreate all dependent
> constraints and all indices too.
>
> So, as you might believe, we're not very happy with this solution. If
> you find a better one, let us know please.
>
> Ciao, Andreas
> -
> Andreas Baumkötter, PRO DV Software GmbH, Dortmund, Germany
> Email to: baumkoetter_at_prodv.de

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Received on Tue Apr 22 1997 - 00:00:00 CDT

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