单项选择题
A.You must recover all data files to the required system change number （SCN）.
B.You must recover all data files， except those that are offline， to the required SCN .
C.You must recover all data files belonging to the USERS tablespace to the required SCN.
D.You cannot recover all data files because segment space management is performed manually for the undo tablespace.
多项选择题 Your database operates in ARCHIVELOG mode and all the tablespaces are online. Due to a user error， you decided to perform an incomplete recovery. Which two tasks would you be required to perform in the recovery process？ （）
单项选择题 Your database operates in ARCHIVELOG mode. The redo log files are not multiplexed and one of the online redo logs is missing. The missing redo log sequence， 230， is not archived， and it contained information from 10：35 a.m. onwards. The current time is 11：00 a.m. Because of a disk crash， you executed the following command to perform an incomplete recovery： RMAN> RUN { 2> SET UNTIL SEQUENCE 230 THREAD 1 3> ALTER DATABASE MOUNT 4> RESTORE DATABASE 5> RECOVER DATABASE 6> ALTER DATABASE OPEN RESETLOGS 7> } With reference to this scenario， which statement is true？（）
多项选择题 Foranincompleterecovery，whichfourbackuptypescanbeusedbyRecoveryManager（RMAN）torestoredatafiles？（）
