[单选]

Your database supports a DSS workload that involves the execution of complex queries: Currently, the library cache contains the ideal workload for analysis. You want to analyze some of the queries for an application that are cached in the library cache.
What must you do to receive recommendations about the efficient use of indexes and materialized views to improve query performance?（）

设电动机某一转动方向的转速n为正，则约定电动机转矩TM与n（）的方向为（）。 一致、正向。 一致、反向。 相反、正向。 以上都不对。 “云”是网络、互联网的一种比喻说法。过去往往用云来表示电信网，后来也用来表示（）和底层基础设施的抽象。 移动互联网。 局域网。 互联网。 Intranet。 Your boss at Certkiller .com wants you to clarify Oracle 10g. Which statement regarding the contents of the V$PARAMETER view is true？（） Displays only the list of default values。 Displays only the list of all basic parameters。 Displays the currently in effect parameter values。 Displays only the list of all advanced parameters。 Displays the list of all the parameter files of a database。 Displays the current contents of the server parameter file.。 当塞柄密封圈密封不严时，正确的处理办法是（） A、更换塞柄上的密封圈 。 B、焊死塞柄的单向阀 。 C、卡环卡死塞柄 。 D、更换塞柄。 What is the result when the programmer attempts to compile the code and run it with the command java Converter 12？（） It is true that j==i.。 It is false that j==i.。 An exception is thrown at runtime.。 Compilation fails because of an error in line 13.。

Your database supports a DSS workload that involves the execution of complex queries: Currently, the library cache contains the ideal workload for analysis. You want to analyze some of the queries for an application that are cached in the library cache.
What must you do to receive recommendations about the efficient use of indexes and materialized views to improve query performance?（）