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RE: ROWNUM strangeness?

From: Fink, Dan <Dan.Fink_at_mdx.com>
Date: Thu, 29 Aug 2002 10:23:50 -0800
Message-ID: <F001.004C2E1D.20020829102350@fatcity.com>


Actually, ROWNUM has nothing to do with
extents/segments/inserts/updates/deletes. It is all about access paths. The solution posted makes sense as ROWNUM can be affected by many subsequent operations.

-----Original Message-----
Sent: Thursday, August 29, 2002 11:04 AM To: Multiple recipients of list ORACLE-L

Holes in your extents/segments. Normal. You get this after repeated updates/deletes/inserts.

ltiu

Paul Baumgartel wrote:

>I've been given a query to investigate. The performance varies
>extremely depending on whether the entire result set is fetched or a
>ROWNUM < n clause is attached; that makes sense to me. What doesn't
>make sense is the following: if we add WHERE ROWNUM < 50, the query
>returns 24 rows. If we add WHERE ROWNUM < 1000, the query returns 336
>rows!
>
>I don't know the size of the entire result set (I'm running a count
>right now), but if the result set consists of at least 336 rows,
>shouldn't WHERE ROWNUM < 50 return 49 rows?
>
>TIA!
>
>
>
>=====
>Paul Baumgartel, Adept Computer Associates, Inc.
>paul.baumgartel_at_aya.yale.edu
>
>
>
>
>
>__________________________________________________
>Do You Yahoo!?
>Yahoo! Finance - Get real-time stock quotes
>http://finance.yahoo.com
>
>

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Author: Fink, Dan
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Received on Thu Aug 29 2002 - 13:23:50 CDT

Original text of this message

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