70-305 Developing and Implementing Web Applications with Microsoft Visual Basic.NET
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Demo Question 8.
You work as the Web developer at EliteCertify.com. You create a new ASP.NET application named EliteCertify App05. Customers will use EliteCertify App05 to purchase competition tickets. You expect over 300 tickets to be purchased per minute. Which isolation level should you use to ensure that these transactions are completed safely?
A. Use ReadCommitted
B. Use ReadUncommitted
C. Use RepeatableRead
D. Use Serializable
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Answer: D
The Serializable value of the TransactionIsolationLevel enumeration specifies that no users should be able to
add rows or modify data in a data set while a transaction is open. The ReadCommitted value specifies that
locks are placed on the data while it is being read, but data can still be altered before the transaction is
complete. No locks are held in a ReadUncommitted transaction. With RepeatableRead, a transaction will
prevent others from modifying data while a transaction is open, but phantom rows can still be created.
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