Re: Delete slowing..

From: Stephane Faroult <sfaroult_at_oriole.com>
Date: Tue, 27 Nov 2001 13:12:12 -0800
Message-ID: <F001.003CE015.20011127115520@fatcity.com>

Mark Leith wrote:
>
> Hi list people :)
>
> We have a customer who has been running a particular delete statement
> against a table for a while now, which usually ran within minutes. All of a
> sudden this table has suddenly gone from a few minutes right up to 50! He
> wants to diagnose why..
>
> Where would you start?
>
> I have a few ideas of my own - like stale stats, small rollback segments
> etc. - but am after some of your advice also before I get back to him
> tomorrow morning.. Not sure on the Oracle version, OS, or even amount of
> rows he is deleting or size of the table (yet, I'll find this out tomorrow),
> but there has to be a pretty standard way of diagnosing this..
>
> All help appreciated.
>
> Mark
>
> ===================================================
> Mark Leith | T: +44 (0)1905 330 281
> Sales & Marketing | F: +44 (0)870 127 5283
> Cool Tools UK Ltd | E: mark_at_cool-tools.co.uk
> ===================================================

'We have done nothing and suddenly it's slow' is a well known tune. Usual suspects :

Stats, computed or deleted
Dropped index
Newly created trigger
Locks. Nobody doing DML on the same table during the delete ? -- Regards,

Stephane Faroult
Oriole Corporation
Voice: +44 (0) 7050-696-269
Fax: +44 (0) 7050-696-449
Performance Tools & Free Scripts

http://www.oriole.com, designed by Oracle DBAs for Oracle DBAs

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Author: Stephane Faroult
  INET: sfaroult_at_oriole.com

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Received on Tue Nov 27 2001 - 15:12:12 CST