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Which is the most restrictive isolation level in transaction?

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in SQL Server by (80.5k points)
Which is the most restrictive isolation level in transaction?

(a) Repeatable Read

(b) Snapshot

(c) Read Committed

(d) SERIALIZABLE

I had been asked this question in examination.

I'd like to ask this question from Locking topic in chapter Performance Tuning and Optimization of SQL Server

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Correct answer is (d) SERIALIZABLE

The best explanation: When SERIALIZABLE isolation level is set – a range lock is placed on the data set, preventing other users from updating or inserting rows into the data set until the transaction is complete.

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