Re: ROWNUM strangeness?

I agree. I got confused and my second email to disregard my erroneous first emai on this matterl was apparently shot down by the mail filters so it never got to you guys in time.

Sorry for the confision.

ltiu

Fink, Dan wrote:

>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: ltiu
  INET: ltiu_at_alumni.sfu.ca

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