单项选择题
What should you look at first to compute the number of undo blocks written per second to disk？ （）
A.V$UNDOSTAT B.V$TRANSACTION C.V$ROLLSTAT D.DBA_UNDO_EXTENTS E.DBA_ROLLBACK_SEGS
单项选择题 What is true regarding a transaction executed in Automatic Undo Management mode？（）
多项选择题 YoucanuseOracleFlashbacktolookatpastactivityinyourdatabase.WhataretwoothercharacteristicsofOracleFlashback？（）
单项选择题 Whatistrueaboutversion-enabledtables？（）
