Whichtwostatementsaboutthebackgroundprocessofthedatabasewriteraretrue()A.ItispossibletohavemultipledatabasewritersinanOracleinstance.B.Itwritesdirtybuffers，ifany，todatafileswheneveracheckpointoccurs.C.Itwritesdirtybuffers，ifany，todatafileswheneveratransac
题目
Whichtwostatementsaboutthebackgroundprocessofthedatabasewriteraretrue()
A.ItispossibletohavemultipledatabasewritersinanOracleinstance.
B.Itwritesdirtybuffers，ifany，todatafileswheneveracheckpointoccurs.
C.Itwritesdirtybuffers，ifany，todatafileswheneveratransactioncommits.
D.Itwritesdirtybuffers，ifany，todatafilesbeforethelogwriter（LGWR）writes