RE: Creating Histograms

From: Wolfson Larry - lwolfs <lawrence.wolfson_at_acxiom.com>
Date: Thu, 22 Jul 2004 18:26:09 -0500
Message-ID: <433A07749711884D8032B6A0AB115262C2BCA1@conmsx07.corp.acxiom.net>

13 isn't some kind of unlucky number for Oracle, is it?

One of the application teams added a "code" table (I'm pretty sure it was indexed, but definitely analyzed) that only had 13 rows and it killed the application.

Code re-write solved the issue. After it was in production, of course.

-----Original Message-----

From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org]On Behalf Of Jonathan Lewis Sent: Thursday, July 22, 2004 6:19 PM
To: oracle-l_at_freelists.org
Subject: Re: Creating Histograms

It's an quirky little paradox that big tables are usually fine with a small sample, but small tables need the best possible stats.

An error of 'a couple of rows' in a small table is, after all, likely to be a significant percentage error.

Regards

Jonathan Lewis

http://www.jlcomp.demon.co.uk/faq/ind_faq.html The Co-operative Oracle Users' FAQ

http://www.jlcomp.demon.co.uk/seminar.html Optimising Oracle Seminar - schedule updated July 20th

Original Message ----- From: "Niall Litchfield" <niall.litchfield_at_gmail.com>

take note of how many records you add to relatively *small* tables. 13 rows added to one of our tables caused hell until we gathered stats again (and it took ages for anyone to admit that anything ahd changed). That would be 13 rows in the sense of another financial year to add to the 2 existing ones - so hardly significant at all :).

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Received on Thu Jul 22 2004 - 18:25:35 CDT