46.Which two statements are true about the Automatic Database Diagnostic Monitor (ADDM)? (Choose two
2016-07-22 14:50
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46.Which two statements are true about the Automatic Database Diagnostic Monitor (ADDM)? (Choose two.)
A.The ADDM requires at least four AWR snapshots for analysis.
B.The ADDM runs after each AWR snapshot is collected automatically by MMON.
C.The results of the ADDM analysis are stored in the Automatic Workload Repository (AWR).
D.The ADDM analysis provides only diagnostic information but does not provide recommendations.
E.The ADDM calls other advisors if required, but does not provide recommendations about the advisors.
答案：BC
解析：
ADDM(自动数据库诊断监视器)
每个awr快照被记录后，addm就会自动运行，分析与最后两个快照对应的时段中的数据，addm会主动监视实例
多数情况下，addm会为检测到的问题提供解决方案，addm可以检测到一些常见问题如下
1.cpu瓶颈
2.oracle net 连接管理问题
3.锁的竞争
4.IO问题
5.一些数据库实例内存结构的大小不足
6.过载的sql语句
7.plsql和java运行时间过长
8.检查点负载过高及原因(如日志文件过小)
因此：BC正确
A.The ADDM requires at least four AWR snapshots for analysis.
B.The ADDM runs after each AWR snapshot is collected automatically by MMON.
C.The results of the ADDM analysis are stored in the Automatic Workload Repository (AWR).
D.The ADDM analysis provides only diagnostic information but does not provide recommendations.
E.The ADDM calls other advisors if required, but does not provide recommendations about the advisors.
答案：BC
解析：
ADDM(自动数据库诊断监视器)
每个awr快照被记录后，addm就会自动运行，分析与最后两个快照对应的时段中的数据，addm会主动监视实例
多数情况下，addm会为检测到的问题提供解决方案，addm可以检测到一些常见问题如下
1.cpu瓶颈
2.oracle net 连接管理问题
3.锁的竞争
4.IO问题
5.一些数据库实例内存结构的大小不足
6.过载的sql语句
7.plsql和java运行时间过长
8.检查点负载过高及原因(如日志文件过小)
因此：BC正确
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