What's your opinion: ALL_ROWS vs FIRST_ROWS

From: Armstead, Michael A <maa25681_at_glaxowellcome.com>
Date: Tue, 29 Oct 2002 13:13:31 -0800
Message-ID: <F001.004F6CAB.20021029131331@fatcity.com>

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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Author: Armstead, Michael A
  INET: maa25681_at_GlaxoWellcome.com

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