Youhavealargeamountofhistoricaldatainanoperatingsystemfile.Someanalystsinyourorganizationneedtoquerythisdata.Thefileistoolargetoloadintoyourcurrentdatabase.Whichisthemosteffectivemethodtoaccomplishthetask？（）
A.Upgradethehardware/memorytoaccommodatethedata.
B.LoadthedataintoyourdatabasebyusingthePARALLELclause.
C.GiveanalystsDBAprivilege，sothattheycanqueryDBA_EXTERNAL_TABLES.
D.Useanexternaltablesoyoucanhavethemetadataavailableinyourdatabase，butleavethedataintheoperatingsystemfiles.
正确答案：参考D
