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You have executed this command to change the size of the database buffer cache： SQL> ALTER SYSTEM SET DB_CACHE_SIZE=2516582； System altered.  To verify the change in size， you executed this command： SQL> SHOW PARAMETER DB_CACHE_SIZE NAME TYPE VALUE  ------------------- ----------- ------------------  db_cache_size big integer 4194304  （4M）  Why is the value set to 4194304 and not to 2516582（）
A:because 4194304 is the granule size
B:because 4194304 is the standard block size
C:because 4194304 is the largest nonstandard block size defined in the database
D:because 4194304 is the total size of data already available in the database buffer cache

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出自：Oracle认证

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