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Crucial Exams

CompTIA Data+ DA0-002 (V2) Practice Question

During a performance review you discover that a reporting query contains this pattern:

SELECT ...
FROM (
    SELECT CustomerID, SUM(TotalDue) AS TotalSpent
    FROM dbo.Orders
    WHERE OrderDate >= '2024-01-01'
    GROUP BY CustomerID
) AS recent_orders
JOIN dbo.Orders o1 ON o1.CustomerID = recent_orders.CustomerID
JOIN dbo.Orders o2 ON o2.CustomerID = recent_orders.CustomerID;

The execution plan shows the derived subquery against the 50-million-row Orders table is executed three times, causing very high logical reads. Without changing the final results, which action is most likely to reduce execution time and I/O?

  • Add WITH (NOLOCK) hints to all Orders references to avoid locking during the scans.

  • Insert the subquery results into a local temporary table (#recent_orders), add an index on CustomerID, and join the main query to that temporary table.

  • Add an OPTION (FORCESEEK) hint to every Orders reference to force index seeks during each scan.

  • Rewrite the derived subquery as a common table expression (CTE) so SQL Server can cache the result internally.

CompTIA Data+ DA0-002 (V2)
Data Acquisition and Preparation
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