Whichtwostatementsaboutthebackgroundprocessofthedatabasewriteraretrue()
A.ItispossibletohavemultipledatabasewritersinanOracleinstance.
B.Itwritesdirtybuffers，ifany，todatafileswheneveracheckpointoccurs.
C.Itwritesdirtybuffers，ifany，todatafileswheneveratransactioncommits.
D.Itwritesdirtybuffers，ifany，todatafilesbeforethelogwriter（LGWR）writes
正确答案：参考A, B
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