单项选择题
A.Back up the data file.
B.Bring tablespace TS1 online.
C.Copy redo logs to the backup directory.
D.Make a complete backup right after opening the database.
单项选择题 Anindex-organizedtable（IOT）calledSPARSEhashadmanyrecordsdeleted.WhichcommandreorganizestheIOTsothattheemptyspaceisremoved，whileminimizingtheimpactforusers？（）
多项选择题 The CURSOR_SHARING parameter is set to SIMILAR at the instance level and you issue these SELECT statements in the order shown below： SELECT * FROM employees WHERE department_id=50； SELECT * FROM employees WHERE department_id=70； There is an index on the DEPARTMENT ID column of the 1，000，000 row EMPLOYEES table. Ninety percent of the employees are part of the DEPARTMENT_ID 50. In which two scenarios will Oracle9i share the corresponding cursors for the two statements？（）
单项选择题 ThedirecthandoffconnectionmethodtoanOracle9iSharedServerinvolvesfewermessagesthaninpreviousreleasesofthemultithreadedarchitecture.Whichtypeofmessagehasbeeneliminated？（）