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OCP-1Z0-053-V12.02-39題

39.View the Exhibit to examine the Automatic SQL Tuning result details. Which action would you suggest

for the selected SQL statement in the Exhibit?

OCP-1Z0-053-V12.02-39題

A. Accept the recommended SQL profile.

B. Collect statistics for the related objects.

C. Run the Access Advisor for the SQL statement.

D. Run the Segment Advisor for recommendations.

Answer: C

答案解析:

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

SQL 優化指導會分别考察指導任務中包括的每個 SQL 語句。建立一個新索引可能會對查詢有幫助,但也可能增加DML 的響應時間。是以,應使用 SQL 通路指導檢查建議的索引或其它對象對工作量(一組 SQL 語句)的影響,以确定性能是否有淨提高。