单项选择题
A. use DBMS_IJOB package
B. use Oracle Scheduler
C. use DBMS_JOB package
D. use Oracle Data Pump Export and Import
单项选择题 Amediafailurehasoccurred.Thishasresultedinallthemembersofthenextloggroupbeingrenderedinaccessibletothelogwriterprocess（LGWR）atalogswitch.Howdoesthisfailureaffecttheoperationaldatabase？（）
单项选择题 TheEMPLOYEEStableisstoredintheUSERStablespace.YouneedtocheckiftheEMPLOYEEStableisaffectedbytheblockcorruptionfoundintheUSERStablespace.Whichoptionwouldyouuse？（）
单项选择题 YouareworkingonanOracleDatabase10gdatabasethatoperatesintheARCHIVELOGmode.At06：00p.m.，youdiscoveredthatatableintheSYSTEMtablespacethatdoesnotbelongtothedatadictionarywasdroppedat03：00p.m.Whatwouldyoudotorecoverthetable？（）