47.Your database instance is functional for the past one month. The Automatic Workload Repository (A
2016-07-22 15:52
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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.
答案:BC
解析:题目说的是数据库运行一个月了,awr设置的是保存7天,并且STATISTICS_LEVEL 设置的是typical
有投诉所昨天7点到9点数据库很慢,选择2个可以诊断这个问题原因的选项
A:这里说的是ash(active session history),就是活动会话历史,下面是一些ash的东西
1.包含了最近会话活动的历史,ash存放在内存缓冲区中,存放ash的内存是在sga中并且在实例的运行生命周期中为固定的
大小为2m/cpu,oracle规定ash内存缓冲区大小不能超过共享池(shared pool)大小的5%
2.ash机制是对v$session进行采样并只记录正在等待的会话的事件,对非活动的会话不采样
3.ash使用的缓冲区为一个循环使用的缓冲区(rolling buffer)
4.ash统计信息可以通过v$active_session_history视图获取
5.将ash的所有数据都存放到磁盘上是不现实的,oracle在将他们存盘的时候进行过滤,其操作由
mmon每60分钟执行一次
6.只要ash缓冲区一满,MMNL就写入磁盘,这里需要注意mmnl和mmon区别,mmon是将sga都写入磁盘
mmnl是将statistics buffers,也就是ash写入磁盘
它主要是记录等待的会话记录
B: 通过awr将两个时间点的进行比较,这个可以对两个快照进行比较,这个时候可以也就用到了awr基线
C: 由于STATISTICS_LEVEL设置为typical或all,那么addm启用了,addm可以通过两个快照然后给出建议,大多数情况下然后会为检测到的问题提供解决方案,这里使用的时awr的快照
因此这个也可以
D: 这个时addm干的事
(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.
答案:BC
解析:题目说的是数据库运行一个月了,awr设置的是保存7天,并且STATISTICS_LEVEL 设置的是typical
有投诉所昨天7点到9点数据库很慢,选择2个可以诊断这个问题原因的选项
A:这里说的是ash(active session history),就是活动会话历史,下面是一些ash的东西
1.包含了最近会话活动的历史,ash存放在内存缓冲区中,存放ash的内存是在sga中并且在实例的运行生命周期中为固定的
大小为2m/cpu,oracle规定ash内存缓冲区大小不能超过共享池(shared pool)大小的5%
2.ash机制是对v$session进行采样并只记录正在等待的会话的事件,对非活动的会话不采样
3.ash使用的缓冲区为一个循环使用的缓冲区(rolling buffer)
4.ash统计信息可以通过v$active_session_history视图获取
5.将ash的所有数据都存放到磁盘上是不现实的,oracle在将他们存盘的时候进行过滤,其操作由
mmon每60分钟执行一次
6.只要ash缓冲区一满,MMNL就写入磁盘,这里需要注意mmnl和mmon区别,mmon是将sga都写入磁盘
mmnl是将statistics buffers,也就是ash写入磁盘
它主要是记录等待的会话记录
B: 通过awr将两个时间点的进行比较,这个可以对两个快照进行比较,这个时候可以也就用到了awr基线
C: 由于STATISTICS_LEVEL设置为typical或all,那么addm启用了,addm可以通过两个快照然后给出建议,大多数情况下然后会为检测到的问题提供解决方案,这里使用的时awr的快照
因此这个也可以
D: 这个时addm干的事
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