题目：
55. View the Exhibit to examine the output produced by the following query at three different times since
the database instance started and has experienced 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. The database instance is running with manual PGA management.
B.The database instance is running with manual shared memory management.
C.The database instance has the MEMORY_TARGET value set to a nonzero value.
D.All sessions are connected to the database instance in dedicated mode, and no RMAN or parallel query operations have been performed.
参考答案 C
解析：
SGA+ pga
176160768 + 117440512 = 293601280
192937984 + 100663296 = 293601280
192937984 + 100663296 = 293601280
PGA+ SGA的结果是固定的 。SGA大小是变化的，PGA大小也是变化的。
各个组件的大小都是随时变化的。结合这个。可以推断出 设置了memory_target .所以选择C 。
参考文档：
https://docs.oracle.com/cd/E11882_01/server.112/e25494/memory.htm#ADMIN00207