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What are transaction isolation levels?

Q: What are transaction isolation levels?

Isolation levels trade consistency for concurrency: **Read Uncommitted** (dirty reads), **Read Committed** (no dirty reads), **Repeatable Read** (no non-repeatable reads), **Serializable** (full isolation, no phantoms). Higher levels prevent more anomalies but reduce concurrency.

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Explain isolation levels.

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Isolation levels trade consistency for concurrency: Read Uncommitted (dirty reads), Read Committed (no dirty reads), Repeatable Read (no non-repeatable reads), Serializable (full isolation, no phantoms). Higher levels prevent more anomalies but reduce concurrency.

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