2845. Performance: Find queries that may benefit from an index on customer_id and status. — C# ASP.NET + ADO.NET

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

In a performance module, solve this as a production problem using C# ASP.NET + ADO.NET: Find queries that may benefit from an index on customer_id and status. Provide the SQL, explain the logic, show safe application integration, and mention failure/edge cases.

Looking for the latest Sarkari Result 2026 updates? Check the latest government exam results, merit lists and result updates on Sarkari Resultess.

Answer & Explanation

4 Answers

Verified

Option A

UPDATE table_name SET status='active';

Additional Explanation

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

Verified Correct Answer

Option B

EXPLAIN SELECT id,total_amount FROM orders WHERE customer_id=:customer_id AND status='completed' ORDER BY order_date DESC LIMIT 50;

Additional Explanation

EXPLAIN is used to validate the access path; index design should follow actual workload and execution plans.

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

SELECT * FROM table_name;

Additional Explanation

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