问答题

Youareinthemiddleofatransactionandverycrucialdatahasbeenmodified.Becauseofahardwarefailure，theinstancehasshutdownbeforesynchronizingallthedatabasefiles.Whichtwostatementsaretrue？（）

A.Onstartup，SMONcoordinatesinstancerecovery.
B.Onstartup，CKPTcoordinatesinstancerecovery.
C.Onstartup，useRMANtoperforminstancerecovery.
D.Uncommittedchangeswillberolledbackafterthedatabaseisopened.
E.Onstartup，performmediarecoveryandtheninstancerecovery.
F.Onstartup，allthefileswillbesynchronizedandyougetbothcommittedanduncommitteddata.

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WhichtwoconstructanOutputSreamthatappendstothefile“file.txt”？（）

A.OutputStreamout=newFileOutputStream（“file.txt”）；
B.OutputStreamout=newFileOutputStream（“file.txt”，“append”）；
C.FileOutputStreamout=newFileOutputStream（“file.txt”，true）；
D.FileOutputStreamout=newFileOutputStream（newfile（“file.txt”））；
E.OutputStreamout=newFileOutputStream（newFile（“file.txt”）true）；

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switch（i）{default：310－025LeadingthewayinITtestingandcertificationtools，www.testking.com－27－System.out.printIn（Hello”）；}Whatarethetwoacceptabletypesforthevariablei？（）

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D.Double
E.Object