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单项选择题 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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