单项选择题

You are designing a Windows Azure application. The appl……

You are designing a Windows Azure application.
The application includes a web role and a worker role that communicate by using a Windows Azure Queue.
The worker role processes each message within 10 seconds of retrieving it from the queue. The worker role must process each message exactly one time.
If a process does not complete， the worker role must reprocess the message.
You need to recommend an approach for the worker role to manage messages in the queue.
What should you recommend？（）

A. Process the message and then delete it from the queue.
B. Delete the message from the queue when retrieving the message.
C. Set the visibility timeout of the message to 1 when retrieving the message.
D. Process the message and then set the visibility timeout of themessage to the maximum value.

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多项选择题You are planning the migration of a Microsoft SQL Server 2008 database to SQL Azure. You need to recommend an approach for ensuring that database connectivity does not degrade. Which two actions should you recommend？（）

A. Implement transactions for database queries.
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C. Use Microsoft ADO.NET in the data access layer.
D. Implement a retry policy in the data access layer.

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A. Create a database view to retrieve the data.
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单项选择题An application uses Windows Azure Table storage. The application uses five tables. One table used by the application is approaching the limit for storage requests per second. You need to recommend an approach for avoiding data access throttling. What should you recommend？（）

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A. Ensure that all statements execute in the same database transaction.
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单项选择题You are designing a Windows Azure application that will store data in two SQL Azure databases. The application will insert data in both databases as part of a single logical operation. You need to recommend an approach for maintaining data consistency across the databases. What should you recommend？（）

A. Execute database calls on parallel threads.
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C. Use Microsoft Distributed Transaction Coordinator （MSDTC）.
D. Handle errors resulting from the database calls by using compensatory logic.