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围蛹（名词解释)

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YourdatabaseisinARCHIVELOGmode.OnFridayevening，youperformanonlinedatabasebackupbyusingtheBACKUPDATABASEcommandattheRecoveryManager（RMAN）promptandclosethe
database.OnMonday，theSystemAdministratorinformsyouaboutthefailureoftwoharddisks.Oneofthelostdiskscontainstwodatafiles，HR1.DBFandHR2.DBF，bothofwhichbelongtoaread/writetablespacenamedHR.Thediskalsocontainsadatafile，USERS.DBF，whichbelongstoaread/writetablespacenamedUSERS.YouneedtorestoreandrecoverthedatabasebackupthatwasperformedonFridayevening.Aftermountingthedatabase，youissuethefollowingRMANcommands：
RMAN＞RESTOREDATABASE；
RMAN＞RECOVERDATABASE；
AftersuccessfullyexecutingtheseRMANcommands，youissuethefollowingstatementusingSQL*Plus：
SQL＞ALTERDATABASEOPEN；
Youreceivethefollowingerrorswhenattemptingtoopenthedatabase：
ORA-01157：cannotidentify/lockdatafile10seeDBWRtracefile
ORA-01110：datafile10：’D：\USERS.DBF’
Whatisthecauseoftheseerrors？（）

同主寄生（名词解释)

非专性寄生（名词解释)

颉颃作用（名词解释)