单项选择题
In a situation where no multiplexing of redo logs takes place, what happens when Oracle cannot read data from the online redo log group for archiving?（）
A.Nothing happens
B.Oracle will automatically switch redo logs when detected
C.Oracle eventually won't allow new records to be added to the database
D.The instance crashes
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YouareanalyzinghowOracleprocessesuserstatements.SQLandPL/SQLparseinformationisstoredinwhichofthefollowingdatabasememoryareas?（）
A.Library cache
B.Row cache
C.Dictionary cache
D.Large area
E.Buffer cache -
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Youaredesigningthephysicaldatabaselayoutonyourhostmachine.WhatistherelationshipbetweentablespacesanddatafilesintheOracledatabase?（）
A.One tablespace has only one datafile
B.Many tablespaces can share one datafile
C.One tablespace can have many datafiles
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Duringregulardatabaseoperation,whichbackgroundprocesswilltakesmallerblocksoffreespaceinadictionary-managedtablespaceandmovethingsaroundtomakebiggerpiecesoffreespace?（）
A.DBW0
B.LGWR
C.ARCH
D.SMON
E.PMON
