good value for optimizer_index_cost_adj

From: paquette stephane <stephane_paquette_at_yahoo.com>
Date: Wed, 24 Apr 2002 06:58:39 -0800
Message-ID: <F001.0044DD19.20020424065839@fatcity.com>

Hi,

Oracle 817/Solaris 8.

Users are doing select joining using the PKs of 2 partitionned tables. Partitionned key and the primary key are the same.

The access plan is a nested loop with a full table scan on the first table which hold 700 000 rows. The block size is 16K, I assume that's why Oracle is doing FTS.
By using optimizer_index_cost_adj, I can make Oracle use the PK of the first table. I've used 50 as a value for optimizer_index_cost_adj.
Is that too much ?
Where can I get some metrics on that parameter ?

TIA

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Stéphane Paquette
DBA Oracle, consultant entrepôt de données Oracle DBA, datawarehouse consultant
stephane_paquette_at_yahoo.com

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