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Question 4: You need to update the ImportBooks() method to use database transactions. Which codesegment should you use?
A. SqlConnection.BeginTransaction(IsolationLevel.RepeatableRead);
B. SqlConnection.BeginTransaction(IsolationLeve.ReadUnconvnited);
C. SqlConneetion.BeginTransaction(IsolationLevel.Serializable);
D. SqlConnection.BeginTransaction(IsolationLevel.Snapshot);
Correct Answer: B
Explanation:
* scenario: The ImportBooks() method must keep a copy of the data that can be accessed while new
books are being imported without blocking reads.
* ReadUncommitted A dirty read is possible, meaning that no shared locks are issued and no
exclusive locks are honored.
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