Home » Oracle » 1z0-117 » What is the effect of changing the value of the parameter?
Examine the initialization parameters for a database an OLTP overload.
What is the effect of changing the value of the parameter?
A. It influences the optimizer to always use the value of the parameter?
B. It influences the optimizer to use indexes instead of full table scans as the estimated cost ofthe using index is reduced.
C. It influences the optimizer to use full table scans instead of index scans as the estimated cost of full table scan is reduced.
D. It influenced the optimizer to use bitmap indexes as the estimated cost conversion from bimap is rowed us reduced.
Correct Answer: B
Explanation/Reference:
OPTIMIZER_INDEX_COST_ADJ
OPTIMIZER_INDEX_COST_ADJ lets you tune optimizer behavior for access path selection to be more or less index friendly—that is, to make the optimizer more or less prone to selecting an index access path over a full table scan.
The default for this parameter is 100 percent, at which the optimizer evaluates index access paths at the regular cost. Any other value makes the optimizer evaluate the access path at that percentage of the regular cost. For example, a setting of 50 makes the index access path look half as expensive as normal.
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