单项选择题
A. when all the online redo log groups are multiplexed and one of the members of a group is missing
B. when all the online redo log groups are not multiplexed and one log group is missing
C. when all the control files are missing
D. when some important tables are deleted from the database and purged from the Recycle Bin
单项选择题 YouareperforminganincompleterecoverybecausesomeimportanttableshavebeendroppedandpurgedfromtheRecycleBin.WhichclausecanyouNOTusetoperformtheincompleterecoverybyusingtheRMANutility？（）
单项选择题 YouaremaintainingyourdatabaseinOracle10g.Youareperforminganincompleterecoverybecausethetablespace，DATA1，wasdroppedandpurgedfromtheRecycleBin.Afterperforminganincompleterecovery，youopenthedatabasewiththeRESETLOGSoption.WhatwillNOTbetheimpactofusingtheRESETLOGSoption？（）
单项选择题 Youissuedthefollowingstatement：SQL>ALTERDATABASEBACKUPCONTROLFILETOTRACE；Whatwillbetheresultofissuingthestatement？（）