单项选择题

WhichstatementistrueabouttheUNDO_RETENTIONparameterwhenretentionguaranteeisnotenabled（）

A.Itisthetimeperiodafterwhichtheundodatabecomesobsolete.
B.Itisthetimeperiodafterwhichthecommittedundodatawouldbetransferredtoatemporarytablespace.
C.Itistheminimumtimeperioduptowhichthecommittedundodatawouldberetainediffreeundospaceisavailable.
D.ItisthetimeperiodafterwhichtheundodataistransferredtotheFlashRecoveryAreatoprovidereadconsistency.

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单项选择题

Wheredoyoufindinformationaboutamissingredologfile？（）

A.tracefile
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C.controlfile
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单项选择题

InwhichsituationmaytheUNDO_RETENTIONparameterbeignored，evenifitissettoavalue（）

A.whenthedatafileoftheundotablespaceisautoextensible
B.whentherearemorethanoneundotablespacesavailableinthedatabase
C.whentheundotablespaceisofafixedsizeandretentionguaranteeisnotenabled
D.whentheundotablespaceisautoextensibleandretentionguaranteeisnotenabled