819. Avoid long transaction — concurrency case 4

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

Write or choose the MySQL approach that reduces race conditions, lock waits or deadlocks in this scenario.

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Answer & Explanation

4 Answers

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Option A

Keep a transaction open while doing network calls.

Additional Explanation

This option is incorrect for the stated requirement.

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Option B

Lock rows in random order in each worker.

Additional Explanation

This option is incorrect for the stated requirement.

Verified Correct Answer

Option C

START TRANSACTION; SELECT id FROM tasks WHERE id=10 FOR UPDATE; UPDATE tasks SET status='processing' WHERE id=10; COMMIT;

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

Use SELECT without a transaction for a critical read-modify-write sequence.

Additional Explanation

This option is incorrect for the stated requirement.