3649. Rate limit: Count requests from one API key in the current minute. — Concurrency

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

In a rate limit module, solve this as a production problem using Concurrency: Count requests from one API key in the current minute. 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 COUNT(*) request_count FROM api_requests WHERE api_key_id=:api_key_id AND created_at>=CURRENT_TIMESTAMP-INTERVAL 1 MINUTE;

Additional Explanation

Use an indexed timestamp/key path and consider an external rate limiter for high-volume systems.

Verified

Option B

SELECT * FROM table_name;

Additional Explanation

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

Verified

Option C

DELETE FROM table_name;

Additional Explanation

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

Verified

Option D

UPDATE table_name SET status='active';

Additional Explanation

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