784. Inspect InnoDB locks — concurrency case 1

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

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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Editorial Answer 1
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Option B

Use SELECT without a transaction for a critical read-modify-write sequence.
Additional Explanation
This option is incorrect for the stated requirement.
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Editorial Answer 2
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Option C

Lock rows in random order in each worker.
Additional Explanation
This option is incorrect for the stated requirement.
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Editorial Answer 3
Verified Correct Answer

Option D

SELECT * FROM performance_schema.data_locks;
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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Editorial Answer 4