Will the Optimizer always use COST-based approach if
OPTIMIZER_MODE is set to "Cost"?



Will the Optimizer always use COST-based approach if OPTIMIZER_MODE is set to "Cost"?..

Answer / guest

Presence of statistics in the data dictionary for atleast
one of the tables accessed by the SQL statements is
necessary for the OPTIMIZER to use COST-based approach.
Otherwise OPTIMIZER chooses RULE-based approach.

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