第58题-OCP认证062考试题库2019最新考题解析
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我要咨询2018年的时候,OCP 11g考试题库大更新,052 053出现了很多新题,
2019年,11g即将停考的前期,Oracle又出现了一次大变动,12c出现了很多新题,比如062 063题库大更新
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QUESTION 58
You notice a performance change in your production Oracle database and you want to know which change has made this performance difference.
You generate the Compare Period Automatic Database Diagnostic Monitor (ADDM) report to further investigation.
Which three findings would you get from the report?
A. It detects any configuration change that caused a performance difference in both time periods.
B. It identifies any workload change that caused a performance difference in both time periods.
C. It detects the top wait events causing performance degradation.
D. It shows the resource usage for CPU, memory, and I/O in both time periods.
E. It shows the difference in t he size of memory pools in both time periods.
F. It gives information about statistics collection in both time periods.
Correct Answer: ABD
(解析:对两个 AWR 快照周期进行完整的 ADDM 分析,检测原因、测量影响,然后将其关联起来:工作负荷变化、配置变化。
影响:回归 SQL,达到资源限制(CPU、I/O、内存、互连)提出可操作的建议以及量化的影响*确定改变了什么/配置更改,工作负荷更改
*当您的数据库在过去(例如 6 个月前)以最佳方式运行时,数据库的性能会降低,但会逐渐降低到用户可以注意到的程度。“Automatic Workload Repository(AWR)Compare Periods”报告允许您比较两个时间段之间的数据库性能。
当 awr 报告显示两个快照(或两个时间点)之间的 awr 数据时,awr compare periods 报告显示两个时间段(或两个总共有四个快照的 awr 报告)之间的差异(abe)。使用 awr compare periods报告可以帮助您识别两个时间段之间不同的详细性能属性和配置设置。参考:解决性能随时间而降低的问题)