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OracleDBA回滚段管理练习附答案OracleDBA回滚段管理精选练习(附答案)Q.1:Whatsystemprivilegeisrequiredtocreatearollbacksegment?1.Createdatabase2.Createrollbacksegment3.Alterdatabase4.CreatesegmentA:2Q.2:Oraclerecommendsthisnumberofminimumextentsinarollbacksegment1.02.13.24.3A:3Q.3:Oraclerecommendsthatthefollowingsegmentsizewhencreatingarollbacksegment1.INITIAL>NEXT2.INITIAL=NEXT3.INITIAL<NEXT4.NONEOFTHEABOVE2Q.4:TheOPTIMALparameterforarollbacksegmentshouldbeset1.largeforlong-frequentlyrunningtransactions,smallforshorttransactions.2.smallforlong-frequentlyrunningtransactions,largeforsmalltransactions.3.smallforalltransactions4.largeforalltransactions1Q.5:Incaseofsystemfailure,Thistypeofsegmentisusedtoundothechanges1.DataSegment2.TempSegment3.RedoSegment4.RollbackSegment4:RollbackSegmentsareusedtorollbackinformationthathasalreadybeenappliedtodatabase.Duringrecovery,thedatabaseisrolledforwardandthenbackwardstoaconsistentstate.Q.6:Thisisavalidstorageparameterwhencreatingarollbacksegment1.FREELISTS2.OPTIMAL3.PARTITION4.NONEOFTHEABOVE2Q.7:Madhucreatedacoupleofprivaterollbacksegments.Whatshouldhedonowtomakethemonlineautomaticallyduringstartup1.Grantonlineduringstartuptothesegments2.Addrollback_segments=(rbs1,rbs2)inparameterfile3.Dropsegmentsandrecreatethemasprotected4.Noneoftheabove2Q.8:Whichistrueregardingrollbacksegments1.SystemRollbackSegmentCannotbeputinanofflinemode2.Tablespacescontainingrollbacksegmentswithactivetransactionscanbeputinofflinemode3.Alloftheabove4.Noneoftheabove1Q.9:Arollbacksegment____1.writestotheredologs2.requiresoneforeachtablespace3.recordschangesonlyaftertheyarecommitted4.providesforreadconsistency4Q.10:Whichtypeofsegmentcanrecordchangesformultipletransactions1.DATASEGMENT2.TEMPSEGMENT3.ROLLBACK4.NONEOFTHEABOVE3Q.11:Thetypeofrollbacksegmentthatiscreatedwhenatablespacegoesofflineis1.PRIVATE2.PUBLIC3.DEFFERED4.PROTECTED3