单项选择题
A.recover using Oracle Flashback Database technology
B.restore the data files from backup and perform a complete recovery
C.restore only the corrupted data file and perform tablespace recovery
D.restore the data files from backup and perform cancel-based recovery
E.restore the entire database from the most recent backup and start the instance and open the database
单项选择题 Your database is running under automatic undo management and the UNDO_RETENTION parameter is set to 900 sec. You executed the following command to enable retention guarantee： SQL> ALTER TABLESPACE undotbs1 RETENTION GUARANTEE； What effect would this statement have on the database？（）
单项选择题 WhichstatementistruewhenyouruntheSQLTuningAdvisorwithlimitedscope？（）
多项选择题 Youplantousestaticdatabaseregistrationforanewlistenerwhenyoucreateit.Whatcouldbethetworeasonsforthis？（）