单项选择题
A.Shut down the database, restore the two data files and then start up the database.
B.Take the system and users tablespace offline, restore the two data files, recover the two datafiles, and then bring the SYSTEM and USERS tablespaces online.
C.Shut down the database, restore the two data files, start up the database in MOUNT mode, recover the two data files, and then alter the database open.
D.Take the SYSTEM and USERS tablespaces offline, recover the two datafiles and then bring the SYSTEM and USERS tablespaces online.
单项选择题 YourcompanydecidedtostartusingRMANinitsbackupstrategy.Previouslyyourcompanyusedoperatingsystemfilecopies.WhichcommandisusedtomakeRMANawareofexistingbackupsmadebycopyingfilesattheoperatingsystem？（）
单项选择题 Theclientconnectedtothedatabaseturnsoffhisorhermachinewithoutexitingfromaconnectiontothedatabase.Whichtypeoffailureisthis？（）
单项选择题 You configured automatic archive logging for the database. On the next startup the database runs for a while， but then hangs. After checking the alert log， you determine that all the online redo logs need archiving. Which step was skipped when you set up automatic archive log？（）