单项选择题
A. Flashback Table
B. Flashback Database
C. Flashback Version Query
D. The RMAN REPORT command
E. The DBA_PENDING_TRANSACTIONS view
单项选择题 WhateffectshouldthelossofanindextablespacehaveonanOracleinstancethatisrunning？（）
单项选择题 Why would you use the following FLASHBACK TABLE command？（） FLASHBACK TABLE emp TO TIMESTAMP （’11：45’.’hh12：mi’）；
多项选择题 Intheparameterfileofyourproductiondatabase，theFAST_START_MTTR_TARGETparameterissetto300tooptimizeinstancerecovery.Whileobservingtheperformanceofthedatabaseduringinstancerecovery，youfindthattheredologfilesarenotsizedproperlytosupportthisactivity.Whichtwosourcescouldyouusetodeterminetheoptimalsizeoftheredologfiles？（）