13. DBMS optimizer

DBMS Published 30 Sept 2026 Updated 30 Sept 2026 0 Views Verified

What is the role of a query optimizer?

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Answer & Explanation

4 Answers

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Option A

It converts SQL into HTML.

Additional Explanation

This option is incorrect for the stated requirement.

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Option B

It evaluates possible execution strategies and chooses an execution plan based on estimated costs and available statistics.

Additional Explanation

Correct implementation. Prefer parameterized queries in application code, validate affected rows for UPDATE/DELETE, and use transactions for related writes.

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Option C

It changes application passwords.

Additional Explanation

This option is incorrect for the stated requirement.

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Option D

It creates user interfaces.

Additional Explanation

This option is incorrect for the stated requirement.