多项选择题
A.Global indexes are rebuilt automatically at the end of the DDL operation thereby avoiding problems with the UNUSABLE status.
B.You do not have to search for invalid global indexes after the DDL command completes and rebuild them individually.
C.Global indexes are maintained during the operation of the DDL command and therefore can be used by any concurrent query.
D.Global indexes remain intact and available for use by data manipulation language （DML） statements even for sessions that have not enabled the skipping of unusable indexes.
单项选择题 Thereismorethanonewaytosettheservertodetectandaffectlongrunningoperationsautomatically.Whatisthebestchoiceofyouwanttoreducetheimpactoflongrunningoperationsonotheruserswithoutabortingthelongrunningoperations？（）
多项选择题 he Dynamic SGA feature allows the SGA to grow and shrink dynamically according to an ALTER SYSTEM command. This avoids the previous need of shutting down the instance in order to modify the components of the SGA， namely the buffer cache and shared pool components. Which three statements are true for the Dynamic SGA feature？ （）
单项选择题 Oracle9iextendsthecursorsharingfunctionalitywiththenewvalueofSIMILARfortheCURSOR_SHARINGparameter.WithCURSOR_SHARING=SIMILAR，cursorsaresharedforsafeliteralsonly.Whatismeantby‘safeliteralsonly’？（）