A.A user table was lost at the specified time.B.A redo ……

单项选择题The current time is 12：00 noon. You want to recover the USERS tablespace from a failure that occurred at 11：50 a.m. You discover that the only member of an unarchived redo log group containing information from 11：40 a.m. onwards is corrupt.  With reference to this scenario， if you are not using Recovery Manager （RMAN）， which recovery method would you use？（）

A.time­based recovery
B.log sequence recovery
C.cancel­based recovery
D.change­based recovery

多项选择题YourdatabaseisfunctioninginARCHIVELOGmode.Inwhichtwosituationswouldyouperformacancel­basedrecovery？（）

A.You find that one of the redo log members in each redo log group is lost.
B.You find that a data file that belongs to the USERS tablespace is damaged.
C.You find that a data file that belongs to the SYSTEM tablespace is damaged.
D.You find that the current redo log group is damaged and is not available for recovery.
E.You realized while performing a recovery that an archived redo log file needed for recovery is lost.

单项选择题You have only two redo log groups and these groups get overwritten several times in a day. Your database operates in NOARCHIVELOG mode and user­managed consistent backups are performed every Sunday night. On Thursday morning， you find that an important table has been dropped and purged.  With reference to this scenario， up to what point in time can the data be recovered？（）

A.until Thursday morning
B.until last Sunday’s backup
C.until Wednesday evening
D.until that point in time when the database is opened
E.until that point in time when the recovery is performed
F.until that point in time when the table is dropped and purged

单项选择题YourdatabaseoperatesinARCHIVELOGmodeanduser­managedconsistentbackupsareperformedeverySundaynight.OnTuesday，at9：00a.m.thecurrentlogsequencenumberwas369.Also，onTuesdayyoulostthedatafilebelongingtotheSYSTEMtablespaceandanarchivelogfile（sequencenumber356）thatcontainedredoentriesbetween8：00a.m.and8：30a.m.Withreferencetothisscenario，whatwouldyoudotorecoverthedatabase？（）

A.restore all the data files from last Sunday’s backup， and then perform a time­based recovery
B.restore all the data files from last Sunday’s backup， and then perform a cancel­based recovery
C.restore all the data files from last Sunday’s backup， and then perform a change­based recovery
D.restore only data files that belong to the SYSTEM tablespace from last Sunday’s backup， and then perform a complete recovery

单项选择题Your database operates in ARCHIVELOG mode. User­managed consistent backups are performed every Sunday night.  On Tuesday， client A drops a table at 8：00 a.m. as follows：  SQL> DROP TABLE cust_ord PURGE  Table dropped.  Client B executes a query at 9：00 a.m. on the same table as follows：  SQL> SELECT * FROM cust_ord SELECT * FROM cust_ord *  ERROR at line 1：  ORA­00942： table or view does not exist  Client B needs the dropped table and reports the problem to you. With reference to this scenario， which action should you take？（）

A.retrieve the table by using the flashback feature
B.restore all the data files from last Sunday’s backup， and then perform a time­based recovery
C.restore all the data files from last Sunday’s backup， and then perform a log sequence recovery
D.restore all the data files from last Sunday’s backup， and then perform a cancel­based recovery
E.restore from last Sunday’s backup only data files that belong to the tablespace in which the table was stored， and then perform a complete recovery