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Youhaveexecutedthiscommandtochangethesizeofthedatabasebuffercache：SQL>ALTERSYSTEMSETDB_CACHE_SIZE=2516582；Systemaltered.Toverifythechangeinsize，youexecutedthiscommand：SQL>SHOWPARAMETERDB_CACHE_SIZENAMETYPEVALUE---------------------------------------------
题目
Youhaveexecutedthiscommandtochangethesizeofthedatabasebuffercache：SQL>ALTERSYSTEMSETDB_CACHE_SIZE=2516582；Systemaltered.Toverifythechangeinsize，youexecutedthiscommand：SQL>SHOWPARAMETERDB_CACHE_SIZENAMETYPEVALUE------------------------------------------------db_cache_sizebiginteger4194304（4M）Whyisthevaluesetto4194304andnotto2516582（）
A.because4194304isthegranulesize
B.because4194304isthestandardblocksize
C.because4194304isthelargestnonstandardblocksizedefinedinthedatabase
D.because4194304isthetotalsizeofdataalreadyavailableinthedatabasebuffercache