Optimizer parameters……

optimizer_index_caching indicates the percentage of index blocks that WILL be cached;
optimizer_index_cost_adj indicates the percentage of table blocks that will NOT be cached.

Of course, optimizer_index_caching applies only to branch blocks and only for nested loop joins and in list iterators and, at the end of the day, it’s just a number for which we invent a meaning.

ref: http://jonathanlewis.wordpress.com/2006/10/24/optimizer_index_cost_adj/


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