题目内容

Mediarecoverycansometimesbestoppedbytheinabilitytoreadpastacertainpointintheredostream.Thisisoftenreferredtoasstuckrecovery”.BeforeOracle9i，the
DatabaseAdministratorhadfewoptionstodealwithstuckrecovery.Ifthecorruptredocouldnotberecoveredfromsomeothersource，thenalltransactionsthatcommittedafterthecorruptpointintheredosteamwouldbelost.
Oracle9ichangesthatwiththeTrialRecoveryfeature.TrialRecoverisusedtotesttheapplicationoftheredologstothedatabase.
WhatarethreeothercharacteristicsofTrialRecovery（）

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