Teach Cloud - Cloud, DevOps, and Python Backend Development Blog

❓ Quiz Question

Aug 30, 2026

Quiz: What is Database Sharding?

Database Sharding splits dataset rows across distinct database nodes based on a shard key to overcome single-node resource limits.

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❓ Quiz Question

Aug 30, 2026

Connection Pooling reuses established database TCP handles, eliminating latency caused by constant handshake negotiations.

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❓ Quiz Question

Aug 30, 2026

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

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❓ Quiz Question

Aug 30, 2026

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

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❓ Quiz Question

Aug 30, 2026

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

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❓ Quiz Question

Aug 30, 2026

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

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

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❓ Quiz Question

Aug 30, 2026

Composite Primary Keys use multiple attribute combinations (e.g. user_id, role_id ) to ensure uniqueness.

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