At5:30PM,adatabaseadministrator,William,isinformedthatanimportantrecordofemployeenoE0025ismissingfromtheSCOTT.EMPLOYEEtable.At4:30P.M,thetablecontainedtherecordofemployeenoE0025.WilliamissuesthefollowingcommandtofindtheSQLstatementsthatareusedtoundothedeletion:

SELECToperation,undo_sql,logon_user FROMFLASHBACK_TRANSACTION_QUERYWHERExid= HEXTORAW(’0100043E23456’); where’0100043E23456’isthetransactionIDofthetransactionthatdeletedtherow.Beforeissuingtheabovestatement,whichtaskdidWilliamperformtoidentifythetransactionIDofthetransactionthatdeletedtherow?()

时间:2024-01-16 11:52:04

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