TheUNDO_RETENTIONparameterinyourdatabaseissetto1000andundoretentionisnotguaranteed.Whichstatementregardingretentionofundodataiscorrect?()A.Undodatabecomesobsoleteafter1，000seconds.B.Undodatagetsrefreshedafterevery1，000seconds.C.Undodatawillbestoredpermane
题目
TheUNDO_RETENTIONparameterinyourdatabaseissetto1000andundoretentionisnotguaranteed.Whichstatementregardingretentionofundodataiscorrect?()
A.Undodatabecomesobsoleteafter1，000seconds.
B.Undodatagetsrefreshedafterevery1，000seconds.
C.Undodatawillbestoredpermanentlyafter1，000seconds.
D.Committedundodatawouldberetainedfor1，000secondsiffreeundospaceisavailable.
E.UndodatawillberetainedintheUNDOtablespacefor1，000seconds，thenitgetsmovedtotheTEMPORARYtablespacetoprovidereadconsistency.