单项选择题 You have created a password file using the following command：   ORAPWD file=d：\oracle\ora9i\orapwU01 password=change_on_install entries=3   Which of the following is true about this password file？（）

单项选择题 AdamisworkingasaDatabaseAdministrator（DBA）forTeleSoftCorporation.HisdatabaseisrunningintheARCHIVELOGmode.Duringdatabasestartup，hediscoversthatoneofthediskscrashed，resultinginthepermanentlossofaread-writeUSERStablespace.TheUSERS01.dbfdatafilebelongstotheUSERStablespaceandis500MBinsize.HeneedstorecovertheUSERStablespacefromthebackup.Whilereviewingthebackupdetails，hediscoversthatthemostrecentavailablebackupisfivedaysold.ThisbackupwastakenwhentheUSERStablespacewasread-only.Aftercorrectingthehardwareproblemthatcausedthefailure，whatshouldAdamdotorecovertheUSERStablespace？（）

单项选择题 Your database is in manual archive mode. Your online redo log groups are configured as follows： You discover that DISK 3 has encountered a media failure that has resulted in a loss of all the multiplexed copies of online redo log files.   You decide to delete the REDO01C.LOG， REDO02C.LOG， and REDO3C.LOG files to prevent the LGWR background process from attempting to access these files. When you query the V$LOG dynamic view， you receive the following output： Which sequence of statements should you use to drop the missing online redo log files from the database？（）        1.  ALTER DATABASE DROP LOGFILE MEMBER ’E：\REDO01C.LOG’；        2.  ALTER SYSTEM SWITCH LOGFILE；        3.  ALTER DATABASE DROP LOGFILE MEMBER ’E：\REDO03C.LOG’；        4.  ALTER SYSTEM ARCHIVE LOG GROUP 3；        5.  ALTER DATABASE DROP LOGFILE MEMBER ’E：\REDO02C.LOG’；        6.  ALTER SYSTEM ARCHIVE LOG GROUP 1；