单项选择题 YouareworkingonanOracleDatabase10gdatabasethatoperatesintheARCHIVELOGmode.At06：00p.m.，youdiscoveredthatatableintheSYSTEMtablespacethatdoesnotbelongtothedatadictionarywasdroppedat03：00p.m.Whatwouldyoudotorecoverthetable？（）

单项选择题 In your database， all the tablespaces are locally managed. You started Recovery Manager （RMAN） using recovery catalog. The following commands are used in the process of recovering the database by using the backup control file：  1.RESTORE CONTROLFILE；  2.RESTORE DATABASE；  3.ALTER DATABASE MOUNT；  4.SQL ALTER TABLESPACE temp ADD TEMPFILE  5.ALTER DATABASE OPEN RESETLOGS；  6.RECOVER DATABASE；  7.STARTUP NOMOUNT；  In what sequence would you use this process to perform the recovery？（）

单项选择题 Youareworkingonadatabase，whereyouhavethreeredologgroups.Whenthedatabaseisdownforabackup，anoperatingsystem（OS）userdeletesalltheredologfilesinagroup.Whatwillhappenwhenyouopenyourdatabase？（）