14. execution plan

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

Why would you inspect EXPLAIN for a slow SELECT?

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Answer & Explanation

4 Answers

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Option A

EXPLAIN commits a transaction.

Additional Explanation

This option is incorrect for the stated requirement.

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Option B

EXPLAIN permanently deletes rows.

Additional Explanation

This option is incorrect for the stated requirement.

Verified Correct Answer

Option C

EXPLAIN shows the optimizer's planned access paths, join methods, indexes and estimated row processing, helping identify expensive operations.

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 D

EXPLAIN disables indexes.

Additional Explanation

This option is incorrect for the stated requirement.