Re: What's your opinion: ALL_ROWS vs FIRST_ROWS

We have an OLTP system that I thought will benefit from first rows. The sad fact is that when I set optimization to first rows the response sucks.

Do some testing, as you can change this anytime.

Yechiel Adar
Mehish
----- Original Message -----
To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com> Sent: Tuesday, October 29, 2002 11:13 PM

> We're moving from RBO to CBO.
>
> For those of you who use CBO, what mode do you use FIRST_ROWS or ALL_ROWS?
> And why?
>
> My thinking is if it's a database where most of the querying is done on
> small sets of records, then we may want to use FIRST_ROWS. On the other
> hand, if our database is used to generate sizable reports, we might use
> ALL_ROWS.
>
> I also understand that we can always change it per session (with alter
> session) and per query (with hints).
>
> Michael Armstead
> Principal Database Administrator, OCP-Certified
> World Wide Corporate IT Database Administration
> GlaxoSmithKline
>
>
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> Please see the official ORACLE-L FAQ: http://www.orafaq.com
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> Author: Armstead, Michael A
> INET: maa25681_at_GlaxoWellcome.com
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-- 
Author: Yechiel Adar
  INET: adar76_at_inter.net.il

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