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What is the disadvantage of cost based optimizers?

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in RDBMS by (118k points)
What is the disadvantage of cost based optimizers?

(a) It is too expensive

(b) It is inefficient in producing results

(c) It does not perform the desired function

(d) None of the mentioned

I got this question in a job interview.

The origin of the question is Choice of Evaluation Plans topic in portion Query Processing and Optimization of RDBMS

1 Answer

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Right answer is (a) It is too expensive

The explanation: Cost based optimizers may be expensive as exploring space of all possible plans might prove to be costly.

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