OPTIMIZER_MODE recommendation for 9.2

From: <Cherie_Machler_at_gelco.com>
Date: Mon, 05 Aug 2002 05:49:45 -0800
Message-ID: <F001.004AB2C6.20020805054945@fatcity.com>

Someone in our development group is recommending that OPTIMIZER_MODE be set to ALL_ROWS in our 9i databases. Everything that I've read recommends setting OPTIMIZER_MODE to choose.

These are a medium-size ODS database that will have reads and writes and a smallish data warehouse and datamart that are going to be used mostly for reporting purposes.

Why wouldn't I want to let Oracle choose? I think the optimizer is working better than ever in 9.2. Why would I want to set up the whole database as ALL_ROWS? Normally, I just use that as a hint in batch jobs or reports. Am I off-base?

Thanks,

Cherie Machler
Oracle DBA
Gelco Information Network

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