The loss of the control file forced you to re­create the control file. After re­creating it and opening the database， you find that some of the data files are named as MISSINGnnnnn， where nnnnn is a five­digit number starting with 0. 
What could be the possible reason？（）

单项选择题Youhavearead­onlytablespaceonread­onlymedia.Youwanttoperformamediarecoveryontheexistingdatafiles，butusingabackupcontrolfile.Thebackupcontrolfileindicatesthatthestatusoftheread­onlytablespacewasread writewhenthecontrolfilewasbackedup.Whatshouldyouconsider？（）

A.drop the read­only tablespace and re­create the tablespace after recovery
B.take data files from the read­only tablespace offline before performing a recovery
C.perform a recovery; status of the tablespace in control file will be changed automatically
D.recovery using backup control file is not possible， so restore all the files from the last full database backup， and then open the database

单项选择题One of the tablespaces is read­only in your database. The loss of all control files forced you to re­create the control file.  Which operation do you need to perform after re­creating the control file and opening the database？（）

A.drop and re­create the read­only tablespaces
B.rename the read­only data files to their correct file names
C.change the tablespace status from read/write to read­only
D.re­create the read­only tablespace because it is automatically removed

单项选择题YoulostthePRODSTDtablespace，whichwasread write.Thetablespacewasread­onlywhenthelastbackupwasperformed.Howwouldyourecoverthetablespace？（）

A.restore the tablespace from the backup; there is no need to apply the redo information 
B.restore the full database to recover the data up to the point when you performed the backup 
C.restore the tablespace from the backup， and then perform a recovery using the backup control file
D.restore the tablespace from the backup， and then recover the tablespace; all the redo information from the point when the tablespace was made read/write is applied

多项选择题Younoticedthattheindextablespaceinyourdatabaserequiresarecovery.However，insteadofperformingamediarecovery，youdecidedtore­createtheindexesinanewtablespace.Whichtwooptionswouldyouusetoreducethetimeittakestore­createtheindexes？（）

A.ONLINE
B.REVERSE
C.PARALLEL
D.COMPRESS
E.NOLOGGING
F.COMPUTE STATISTICS

多项选择题You lost the index tablespace in your database. You decided to re­create the index tablespace and the indexes in the tablespace.  What methods can you use to re­create the indexes？（）

A.Data Pump
B.SQL scripts
C.SQL*Loader
D.Flashback database
E.Recovery Manager （RMAN） script