单项选择题
A. use the Flashback Transaction Query feature to identify the relevant SQL statement and use it to undrop the table
B. restore the entire database from the most recent backup and open it
C. recover the table by using the Flashback Table feature
D. perform point-in-time recovery to recover the table
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？（）
单项选择题 Youhaveonlytworedologgroupsandthesegroupsgetoverwrittenseveraltimesinaday.Your databaseoperatesinNOARCHIVELOGmodeanduser-managedconsistentbackupsareperformedeverySundaynight.OnThursdaymorning，youfindthatanimportanttablehasbeendroppedandpurged.Withreferencetothisscenario，uptowhatpointintimecanthedataberecovered？（）