ocp 一道题的疑惑

[ty_tarena_pger]

You enabled Automatic Shared Memory Management. The initialization parameters are set as shown below:
SGA_TARGET= 10GB
SGA_MAX_SIZE = 14GB
STREAMS_POOL_SIZE = 1GB
SHARED_POOL_SIZE = 3GB
Which two statements are correct in this scenario? (Choose two.)
A. A maximum of 3 GB can be allocated to shared pool.
B. The value for SGA_TARGET can be increased up to a maximum of 15 GB.
C. A total of 14 GB memory will be allocated to the automatically tuned memory components.
D. Increasing the value for SGA_TARGET will automatically increase the memory allocated for STREAMS_POOL_SIZE.
E. Increasing the value for SGA_TARGET to 12 GB will automatically increase the memory allocated to autotuned parameters.
F. Reducing the value for SGA_TARGET to 9 GB will automatically decrease the memory allocated to shared pool from 3 GB to 2 GB.
B为啥就增加到了15G?C为啥不对？

[kfounder]

B和C的考核内容差不多。
关于B：sga_target 可以大于sga_max_size，这时候sga_target 的值生效，sga_max_size就会=sga_target 的值;

关于C：SGA的所有内存加起来可以大于SGA_MAX_SIZE。