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A ________ explores the space of all query evaluation plans that are equivalent to a given query.

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A ________ explores the space of all query evaluation plans that are equivalent to a given query.

(a) Cost based optimizer

(b) Space based optimizer

(c) Time based optimizer

(d) None of the mentioned

The question was asked in exam.

My question is taken from Choice of Evaluation Plans topic in division Query Processing and Optimization of RDBMS

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Correct option is (a) Cost based optimizer

Explanation: A cost based optimizer explores the space of all query evaluation plans that are equivalent to a given query, and chooses the one with the least estimated cost.

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