3179. Security: Find users with suspiciously many failed logins in an hour. — Production Debugging

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

In a security module, solve this as a production problem using Production Debugging: Find users with suspiciously many failed logins in an hour. Provide the SQL, explain the logic, show safe application integration, and mention failure/edge cases.

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Answer & Explanation

4 Answers

Verified

Option A

DELETE FROM table_name;

Additional Explanation

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

Verified Correct Answer

Option B

SELECT user_id,COUNT(*) failures FROM login_attempts WHERE success=0 AND created_at>=CURRENT_TIMESTAMP-INTERVAL 1 HOUR GROUP BY user_id HAVING COUNT(*)>=10;

Additional Explanation

This is a detection query; rate limiting should be enforced closer to the authentication boundary too.

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.