Whichthreestatementsaretrueaboutdatabaserecoveryoperations?()

A.Damagedorlostdatafilesarerestoredfrombackups. B.Redologfileentriesareusedtorollforwardthedatabase. C.Undosegmentsareusedtorollbackanyuncommittedtransactions. D.Transactionsthatwereactivewhenthefailureoccurredarerestarted. E.Transactionsthatwereactivewhenthefailureoccurredareautomaticallycommittedduringtherecoverprocedure.

时间:2024-01-16 13:01:26

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