单项选择题
A. It contains data till the last backup
B. It contains all data from target database until the current time
C. It contains all data from only the committed transactions in the target database
D. It contains all data except that which is used by the transactions in the current online redo file of target database
单项选择题 TheDatabaseResourceManagerisautomaticallyenabledinthemaintenancewindowthatrunstheAutomatedMaintenanceTask.Whatisthereasonforthis？（）
单项选择题 You executed the following commands： SQL> ALTER SESSION SET OPTIMIZER_USE_PENDING_STATISTICS = false； SQL> EXECUTE DBMS_STATS.SET_TABLE_PREFS（’SH’， ’CUSTOMERS’， ’PUBLISH’，’false’）； SQL> EXECUTE DBMS_STATS.GATHER_TABLE_STATS（’SH’， ’CUSTOMERS’）； Which statement is correct regarding the above statistics collection on the SH.CUSTOMERS table in the above session？（）
单项选择题 Multiple RMAN sessions are connected to the database instance. Examine the following output when backup commands are running in server sessions: What could have helped you to correlate server sessions with channels?（）
