单项选择题
A.Until last commit
B.Until the time you perform recovery
C.Until the time the date file got corrupted
D.Until the point where the last transaction begun
E.You cannot recover the SYSTEMtablespaceand must re-create the database.
单项选择题 YouworkasadatabaseadministratorforSupportcenter.cn.Inyourproductiondatabase，thesizeofDatabaseBufferCacheneedstobeincreasedimmediatelyforthecurrentaswellasfutureinstancesofthedatabase.TheOracleinstancehasbeenconfiguredtoaccommodateanychangesinthesizeofthememorystructures.Atthisisproductiondatabase，youwanttoaccomplishthistaskwithnoimpactontheuser’sconnections.Whichactivitymustyouhavecompletedbeforeaccomplishingthistask？（）
多项选择题 You work as a database administrator for Supportcenter.cn. You decided to manage client and server connections using Local Naming method in Supportcenter.cn. When you try to connect to the database you get the following error： ERROR： ORA-12154：TNS：couldnot resolve service name Which network configuration files would you look into to resolve this error？（）
单项选择题 YouworkasadatabaseadministratorforSupportcenter.cn.Youstartedtheinstanceusingtheinit.orafile.Youhavetwocontrolfilesandthreeredologgroupsinyourdatabase.Youdecidedtoprotectthedatabaseagainstfailuresbyaddingonemorecontrolfile.Whichfileistheappropriatewaytoperformthistask？（）