OCP 052考试详解：1Z0-V8.02-第47题
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47. Your database instance is functional for the past one month. The Automatic Workload Repository
(AWR) snapshot retention is set to 7 and the STATISTICS_LEVEL initialization parameter is set to TYPICAL.
You receive a complaint about the poor performance of the database between 7 PM and 9 PM of the
previous day.
Choose two actions any of which can be referred to first to diagnose the problem. (Choose two.)
A.Use the Active Session History report.
B.Use the AWR Compare Periods report.
C.Use an ADDM analysis between 7 PM and 9 PM of the previous day.
D.Use the AWR Compare Period report between 7 PM and 9 PM of the previous day.
Answer: BC
答案解析：
AWR 快照包括数据库统计信息和度量、应用程序统计信息(事务处理量和响应时间)、操作系统统计信息及其它度量。AWR 基线是在一段时间内收集的一组AWR 快照。基线用于性能比较，这既可以是当前性能与基线的比较，也可以是一个基线与另一基线的比较。
