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Oracle uses __________ for the serializable isolation level

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Oracle uses __________ for the serializable isolation level

(a) Multiversion scheme

(b) Timestamp protocol

(c) Lock based protocol

(d) Snapshot isolation

The question was asked in my homework.

My question is from Multiversion Schemes, Snapshot Isolation in section Concurrency Control of RDBMS

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Best answer
The correct option is (d) Snapshot isolation

Easy explanation: Oracle uses snapshot isolation for the serializable isolation level. PostgreSQL also uses only snapshot isolation for the serializable isolation level.

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