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By default sql server has ___________ isolation level

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By default sql server has ___________ isolation level

(a) READ COMMITTED

(b) READ UNCOMMITTED

(c) SERIALIZABLE

(d) REPEATABLE READ

I got this question by my college director while I was bunking the class.

I want to ask this question from Transformation of Relational Expressions in section Query Processing Techniques of Database Management

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Best answer
The correct option is (a) READ COMMITTED

To explain: READ UNCOMMITTED is the most optimistic concurrency isolation option available in SQL Server.

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