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Exam 70-461:Querying Microsoft SQL Server 2012
Troubleshoot & Optimize (25%)
Optimize queries.
May include but not limited to: understand statistics; read query plans; plan guides; DMVs; hints; statistics IO; dynamic vs. parameterized queries; describe the different join types (HASH, MERGE, LOOP) and describe the scenarios they would be used
Manage transactions.
May include but not limited to: mark a transaction; understand begin tran, commit, and rollback; implicit vs explicit transactions; isolation levels; scope and type of locks; trancount
Implement sub-queries.
May include but not limited to: identify problematic elements in query plans; pivot and unpivot; apply operator; cte statement; with statement
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QUESTION NO: 35
You use Microsoft SQL Server 2012 to write code for a transaction that contains several statements.There is high contention between readers and writers on several tables used by your transaction.You need to minimize the use of the tempdb space. You also need to prevent reading queries from blocking writing queries.Which isolation level should you use?
A. Create a user-defined type on the master database.
B. Create a user-defined data type on the model database.
C. Create a user-defined type on the model database.
D. Create a user-defined data type on the master database.
Answer: C
QUESTION NO: 36
You are writing a set of queries against a FILESTREAM-enabled database.You create a stored procedure that will update multiple tables within a transaction.You need to ensure that if the stored procedure raises a run-time error, the entire transaction is terminated and rolled back.Which Transact-SQL statement should you include at the beginning of the stored procedure?
A. SET TRANSACTION ISOLATION LEVEL SERIALIZA3LE
B. SET XACT_ABORT OFF
C. SET TRANSACTION ISOLATION LEVEL SNAPSHOT
D. SET IMPLICIT_TRANSACTIONS ON
E. SET XACT_ABORT ON
F. SET IMPLICIT TRANSACTIONS OFF
Answer: E
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