OCP-1Z0-053-V12.02-162题

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162.View the Exhibit to examine the output produced by the following query at three different times since

the database instance started and has undergone workloads of different capacities:

SQL> SELECT substr(component, 0, 10) COMP, current_size CS,

user_specified_size US

FROM v$memory_dynamic_components

WHERE current_size!=0;

What do you infer from this?

A. All sessions are connected to the database instance in dedicated mode, and no RMAN or parallel

query operations have been performed.

B. The database instance is running with manual shared memory management.

C. The database instance is running with manual PGA management.

D. The database instance has the MEMORY_TARGET value set to a nonzero value.

Answer: D

答案解析：

参考：http://blog.csdn.net/rlhua/article/details/12493791

动态性能视图V$MEMORY_DYNAMIC_COMPONENTS显示所有动态优化的内存组件的当前大小，其中包括SGA 和实例PGA 的总大小。

三次启动的SGA的各个组件大小都一样，是动态变化的，PGA也是动态变化的，所以此数据库是处于自动内存管理即AMM，也即是说MEMORY_TARGET设定为非零值。