View the Exhibit and examine the parameter settings in your server-side parameter file (SPFILE).
When you tried to start the database instance, you received the following error:
Why did the instance fail to start?
A.Because the PGA_AGGREGATE_TARGET parameter is not set
B.Because the STATISTICS_LEVEL parameter is set to BASIC
C.Because MEMORY_TARGET and MEMORY_MAX_TARGET cannot be equal
D.Because both the SGA_TARGET and MEMORY_TARGET parameters are set.
官方答案是D，B的话也可以吧，STATISTICS_LEVEL设置为BASIC会禁用Automatic SGA Memory Management （ASMM）和自动内存管理
https://www.2cto.com/database/201505/403235.html
11g MEMORY_TARGET参数对SGA和PGA的影响
https://www.2cto.com/database/201209/153263.html