A. Implement transactions for database queries.B. Close……

单项选择题A Windows Azure application retrieves data from SQL Azure.   You need to recommend an approach for improving application query performance.  What should you recommend？（）

A. Create a database view to retrieve the data.
B. Use a clustered index on the SQL Azure database tables.
C. Open a new database connection when an operation times out.
D. Create SQL Azure database table indexes basedon application queries

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？（）

A. Use a single partition key for the table.
B. Compress data before storing it in the table.
C. Create additional partition keys for the table.
D. Continually remove unnecessary data from the table.

单项选择题A Windows Azure application stores data in a SQL Azure database.  The application will start an operation that includes three insert statements.  You need to recommend an approach for rolling back the entire operation if the connection to SQL Azure is lost.  What should you recommend？（）

A. Ensure that all statements execute in the same database transaction.
B. Create a stored procedure in the database that wraps the insert statements in a TRY CATCH block.
C. Create a stored procedure in the database that wraps the insertstatements in a TRANSACTION block.
D. Open a new connection to the database. Use a separate transaction scope to roll back the original operation.

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.
B. Wrap the database calls in a single transaction scope.
C. Use Microsoft Distributed Transaction Coordinator （MSDTC）.
D. Handle errors resulting from the database calls by using compensatory logic.

单项选择题An application connects to a SQL Azure database.  The application occasionally loses the connection to the SQL Azure database.   You need to recommend an approach for reliably completing data access operations.  What should you recommend？（）

A. Use Microsoft ADO.NET connection pooling.
B. Pass exceptions to the user interface layer.
C. Implement a retry policy in the data access layer.
D. Begin a transaction before each data access operation.