单项选择题 You use a SQL Server 2005 database named DB1， which is located on a server named SQL1. DB1 is in use 24 hours a day， 7 days a week. A recent copy of DB1 exists on a second server named SQLtest that also runs SQL Server 2005. You detect a high number of full scans on SQL1 and conclude that additional indexes in DB1 are needed. A workload file that is suitable for Database Engine Tuning Advisor （DTA） already exists.   You need to analyze the workload file by using DTA. You must ensure maximum performance on SQL1 during analysis. You must also ensure availability during the implementation of any recommendations suggested by the DTA. What should you do？（）

多项选择题 TestKing.com uses SQL Server 2005. A user reports that an order processing application stopped responding in the middle of an order transaction. The users SQL Server session ID is 54. You need to find out if session 54 is blocked by another connection. If it is,you need to identify the blocking session ID. What are two possible ways to achieve this goal？（）

单项选择题 You manage a SQL Server 2005 database that contains a table with many indexes.  You notice that data modification performance has degraded over time. You suspect that some of the indexes are unused. You need to identify which indexes were not used by any queries since the last time SQL Server 2005 started. Which dynamic management view should you use？（）