640.Examine the parameter setting in your database:
Which statement is correct about the database?
A. Automatic memory management is disabled because PGA_AGGREGATE_TARGET and
SGA_TARGET are not set
B. The instance is started but the database will not be opened until PGA_AGGREGATE_TARGET and
SGA_TARGET are set
C. The database is opened but users cannot perform transactions until PGA_AGGREGATE_TARGET
and SGA_TARGET are set
D. Automatic memory management is enabled and, as per policy, 60% of the memory for System Global
Area (SGA) and 40% of the memory for Program Global Area (PGA) will be distributed at startup
Answer: D
答案解析：
参考：http://blog.csdn.net/rlhua/article/details/12493791
因为Memory_target有设置有值，则启用AMM自动内存管理，使用动态内存管理时，SGA_TARGET和PGA_AGGREGATE_TARGET代表它们各自内存区域的最小设置，要让Oracle完全控制内存管理，这两个参数应该设置为0。
故只能选D。