选择题 4. You have executed this command to change the size ofthe database buffer cache:

A、 because 4194304 is the granule size
B、 because 4194304 is the standard block size
C、 because 4194304 is the largest nonstandard block size defmed in the database
D、 because 4194304 is the total size of data already available in the database buffercache

【正确答案】 A

【答案解析】 Oracle分配内存的单位是granule，即粒度。最小的粒度为4M，设置大小不到一个粒度按一个粒度计算，通过如下的SQL可查看粒度的大小：