题目内容

A 资产负债率
B 现金比率
C 资本化比率
D 固定资产比率
E 股东权益比率

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YouworkasadatabaseadministratoratCertkiller.com.YourdatabaseisopenandrunninginARCHIVELOGmode.YoutakeRMANfullbackupseverySundaynight.OnMondaymorning，whilequeryingtheuser1.employeestable，youreceivethefollowingerrormessage：
01578：ORACLEdatablockcorrupted（file#5，block#51）
ORA-01110：datafile5：’/u01/app/oracle/oradata/orcl/example01.dbf’
Youneedtorectifythecorruptionwhileensuringthefollowing：
Thedatafileshouldremainonline.
Themeantimetorecover（MTTR）shouldbeminimal.
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YouexperiencealossofthediskonwhichtheUSER_DATAtablespacedatafilesarestored.Youattempttorecoverthedatafilesbutdiscoverthatthearchivedredologfilewithsequencenumber45，whichisneededtoperformcompleterecovery，isinvalid.Youthenbeginincompleterecovery-Youreceivethisprompt：
ORA-00279：change309012...03/09/0111：33：56neededforthreadORA-00289：suggestion：
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{=suggested|filename|AUTO|CANCEL}
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AcompanythatmakesComputerAssistedDesign（CAD）softwarehas，withinitsapplication，someutilityclassesthatareusedtoperform3Drenderingtasks.Thecompany’schiefscientisthasjustimprovedtheperformanceofoneoftheutilityclasses’keyrenderingalgorithms，andhasassignedaprogrammertoreplacetheoldalgorithmwiththenewalgorithm.Whentheprogrammerbeginsresearchingtheutilityclasses，sheishappytodiscoverthatthealgorithmtobereplacedexistsinonlyoneclass.The programmerreviewsthatclass’sAPI，andreplacestheoldalgorithmwiththenewalgorithm，beingcarefulthatherchangesadherestrictlytotheclass’sAPI.Oncetestinghasbegun，theprogrammerdiscoversthatotherclassesthatusetheclassshechangedarenolongerworkingproperly.
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