Oracle-L: RE: ROWNUM strangeness?

From: Naveen Nahata <naveen_nahata_at_mindtree.com>
Date: Thu, 29 Aug 2002 08:13:34 -0800
Message-ID: <F001.004C2954.20020829081334@fatcity.com>

Post your query

-----Original Message-----
Sent: Thursday, August 29, 2002 9:23 PM
To: Multiple recipients of list ORACLE-L

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

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Author: Paul Baumgartel
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Author: Naveen Nahata
INET: naveen_nahata_at_mindtree.com

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