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46.What happens when you run the SQL Tuning Advisor with limited scope?

A. Access path analysis is not performed for SQL statements.

B. SQL structure analysis is not performed for SQL statements.

C. SQL Profile recommendations are not generated for SQL statements.

D. Staleness and absence of statistics are not checked for the objects in the SQL Tuning Advisor.

Answer: B

答案解析：

參考：http://blog.csdn.net/rlhua/article/details/13021985

參考：http://docs.oracle.com/cd/E11882_01/server.112/e41573/sql_tune.htm#PFGRF94853

選擇優化任務的適當範圍很重要。如果選擇“Limited（有限制）”選項，SQL 優化指導會根據統計資訊檢查結果、訪問路徑分析結果和SQL 結構分析結果來生成建議。“Limited（有限制）”選項不會產生SQL 概要檔案建議。如果選擇“Comprehensive（綜合）”選項，SQL 優化指導不僅會生成“Limited（有限制）”選項生成的所有建議，在SQL 概要分析模式下還會呼叫優化程式來構建SQL 概要檔案。使用“Comprehensive（綜合）”選項時，還可以指定優化任務的時間限

在有限範圍使用SQL Tuning Advisor 會發生什麼？

SQL Tuning Advisor provides options to manage the scope and duration of a tuning task. You can set the scope of a tuning task either of the following:

• Limited

  In this case, SQL Tuning Advisor produces recommendations based on statistical checks, access path analysis, and SQL structure analysis. SQL profile recommendations are not generated.

• Comprehensive

  In this case, SQL Tuning Advisor carries out all the analysis it performs under limited scope plus SQL Profiling. With the comprehensive option you can also specify a time limit for the tuning task, which by default is 30 minutes.

  根據官方文件，此題應該選C，而不是B.

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