单项选择题
A.by using triggers
B.by using external tables
C.by using anonymous PL/SQL blocks
D.by auditing all DML operations on the table
单项选择题 Asaresultofperformanceanalysis，youcreatedanindexontheprod_namecolumnoftheprod_dettable，whichcontainsabouttenthousandrows.Later，youupdatedaproductnameinthetable.Howdoesthischangeaffecttheindex？（）
多项选择题 WhichtwostatementsaboutFlashbackQueryaretrue？（）
单项选择题 WhilesettingupanOracledatabaseforoneofyourcriticalapplications，youwanttoensurethatthedatabaseisbackedupatregularintervalswithoutyourintervention.Whatshouldyoudotoachievetheobjective？（）