第60題-OCP認證062考試題庫2019最新考題解析
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我要咨詢2018年的時候,OCP 11g考試題庫大更新,052 053出現了很多新題,
2019年,11g即將停考的前期,Oracle又出現了一次大變動,12c出現了很多新題,比如062 063題庫大更新
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QUESTION 60
Which three statements are true about adaptive SQL plan management?
A. It automatically performs verification or evolves non-accepted plans, in COMPRE HENSIVE mode when they perform better than existing accepted plans.
B. The optimizer always uses the fixed plan, if t he fixed plan exists in t he plan baseline.
C. It adds new, bettor plans automatically as fixed plans to the baseline.
D. The non-accepted plans are automatically accepted and become usable by the optimizer if they perform better than the existing accepted plans.
E. The non-accepted plans in a SQL plan baseline are automatically evolved, in COMPREHENSIVE mode, during the nightly maintenance window and a persistent verification report is generated.
Correct Answer: ADE
(解析:通過自適應 SQL 計劃管理,DBA 不再需要為未接受的計劃手動運行驗證或進化過程。當自動 SQL 調優處于綜合模式時,它會在夜間維護窗口中為所有具有未接受計劃的 SQL 語句運行驗證或演進過程。如果未接受的計劃比 SQL 計劃基線中的現有已接受計劃(或計劃)執行得更好,那么該計劃將被自動接受,并由優化器使用。驗證完成后,將生成一份持久性報告,詳細說明未接受計劃與接受計劃績效相比的執行情況。由于演進過程現在是一個自動任務,DBA 也可以在結束時調度自己的進化工作。)