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❓ Quiz Question

Aug 12, 2026

Quiz: What kind of database model is Amazon DynamoDB?

Amazon DynamoDB is a serverless NoSQL database designed for high-throughput applications requiring fast, predictable single-digit millisecond response times.

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Aug 30, 2026

Quiz: What key issue in REST APIs does GraphQL address?

GraphQL enables clients to construct precise queries, preventing transfer of unnecessary payload attributes common in fixed REST responses.

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❓ Quiz Question

Aug 30, 2026

Quiz: When aggregating data with GROUP BY, which clause must be used to filter aggregated group results?

WHERE filters individual rows before aggregation; HAVING filters grouped aggregate metrics (e.g. HAVING COUNT(*) > 5 ).

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Aug 30, 2026

Quiz: What is the purpose of a Database Index (e.g. B-Tree)?

Database Indexes dramatically reduce full table scans by creating sorted pointer trees for quick search execution.

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Aug 30, 2026

Quiz: How does DELETE differ from TRUNCATE in relational database management?

DELETE removes rows individually with transaction log overhead; TRUNCATE resets data pages instantly without row triggers.

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Aug 30, 2026

Quiz: What does a FOREIGN KEY constraint enforce in relational schema design?

A FOREIGN KEY ensures that values in a child table column match existing values in a referenced parent table primary key.

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❓ Quiz Question

Aug 30, 2026

Quiz: Which database isolation level prevents Dirty Reads but allows Non-Repeatable Reads?

Under Read Committed isolation, transactions can only view committed data, preventing uncommitted dirty reads.

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❓ Quiz Question

Aug 30, 2026

Quiz: What is the role of Write-Ahead Logging (WAL) in database engine persistence?

WAL guarantees that transaction modifications are safely recorded in non-volatile storage before confirming commits to clients.

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