2947. Retry: Detect deadlock/lock-timeout candidates from an application error log. — Go database/sql

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

In a retry module, solve this as a production problem using Go database/sql: Detect deadlock/lock-timeout candidates from an application error log. Provide the SQL, explain the logic, show safe application integration, and mention failure/edge cases.

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Answer & Explanation

4 Answers

Verified Correct Answer

Option A

SELECT error_code,COUNT(*) cnt FROM db_error_log WHERE error_code IN ('1213','1205') AND created_at>=CURRENT_TIMESTAMP-INTERVAL 1 DAY GROUP BY error_code;

Additional Explanation

MySQL deadlock and lock-wait errors should be handled with short transactions and bounded retries.

Verified

Option B

DELETE FROM table_name;

Additional Explanation

Incorrect: it does not satisfy the stated business rule and can return/change unintended data.

Verified

Option C

UPDATE table_name SET status='active';

Additional Explanation

Incorrect: it does not satisfy the stated business rule and can return/change unintended data.

Verified

Option D

SELECT * FROM table_name;

Additional Explanation

Incorrect: it does not satisfy the stated business rule and can return/change unintended data.