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Tag: Cloud Digital Leader Exam

Cloud SQL Vs Cloud Spanner Vs Firestore Vs Cloud BigTable-Use Cases

Posted on January 13, 2026May 17, 2026 by DBZtech

“What happens when millions of users click ‘Buy Now’ at the same time?” Behind every smooth e-commerce experience—instant cart updates, reliable payments, and lightning-fast product searches—there is a carefully designed data architecture….

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    🔍 DEBUG CHALLENGE

    Spot the SQL Performance Killer

    Which line in this DB2 query will cause a costly full table scan instead of using the index?

    1: SELECT EMP_ID, SALARY 
    2: FROM EMPLOYEE 
    3: WHERE YEAR(HIRE_DATE) = 2026;
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