optimizer_index_cost_adj and optimizer_index_caching

From: <ryan.gaffuri_at_cox.net>
Date: Fri, 5 Mar 2004 9:30:54 -0500
Message-Id: <20040305143054.FBVM11398.lakemtao02.cox.net@smtp.east.cox.net>

Oracle support(without knowing anything about my system) is telling me to use the following settings:

OPTIMIZER_INDEX_CACHING = 50
OPTIMIZER_INDEX_COST_ADJ = 5 Tom Kyte's book effective Oracle by Design recommends starting optimizer_index_caching at my cache/hit ratio and adjusting as needed.

Tim Gorman's paper 'Search for Intelligent Life in the Cost-Based Optimizer' states that OPTIMIZER_INDEX_COST_ADJ should be set between 10 and 50 for most OLTPs.

This is a hybrid system, but I only have the OLTP parts to stress test(the other parts are still in early phase development). Does anyone have any opinions on this?

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Received on Fri Mar 05 2004 - 08:46:45 CST