单项选择题
A. when all the control files are missing and only a binary backup of the current control file exists
B. when a multiplexed copy of the current control file is missing
C.when all the control files are missing and only a script containing the CREATE CONTROLFILE statement exists
D. when the SPFILE is missing
单项选择题 Inwhichscenariowillyouperformanincompleterecovery？（）
单项选择题 You are working as a DBA in a company. The datafiles in the database are as follows： On Monday， you tried to start up the database but failed because all the control files were missing. You recreated the control file using the script you have created by issuing the ALTER DATABASE BACKUP CONTROLFILE TO TRACE command. What is the prerequisite for recreating the control file？（）
单项选择题 YourdatabaseisinARCHIVELOGmode.Youlostanindextablespaceduetoadiskfailurewhilethedatabasewasopen.YouhaveneitherabackupofthelostindextablespacenorthescriptscontainingtheCREATEINDEXstatementstorecreatetheindexes.Currently，severalusersareexecutinglong-runningqueriesonthedatabase.Whatwillhappentotheongoingactivityinthedatabase？（）