The BACKUP_TAPE_IO_SLAVES parameter is set to FALSE for the database instance. Which statement is true while performing a tape backup in an RMAN session?() A. The tape I/O performed is asynchronousB. The tape buffer is allocated from the System Global Area (SGA)C. The tape buffer is allocated from the Program Global Area (PGA)D. Oracle I/O uses an interrupt mechanism to determine when each I/O completes
The BACKUP_TAPE_IO_SLAVES parameter is set to FALSE for the database instance. Which statement is true while performing a tape backup in an RMAN session?()
A. The tape I/O performed is asynchronous
B. The tape buffer is allocated from the System Global Area (SGA)
C. The tape buffer is allocated from the Program Global Area (PGA)
D. Oracle I/O uses an interrupt mechanism to determine when each I/O completes
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下面哪个函数可以返回逻辑值TRUE()。 A、AND(TRUE，TRUE，FALSE)B、OR(TRUE，TRUE，FALSE)C、OR(FALSE，FALSE，FALSE)D、NOT(TRUE)
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Examine the following command used to perform incremental level 0 backup:RMAN BACKUP INCREMENTAL LEVEL 0 DATABASE;To enable the block change tracking, after the incremental level 0 backup you issued the following command:SQL ALTER DATABASE ENABLE BLOCK CHANGE TRACKING USINGFILE ‘/mydir/rman_change_track.f‘;To perform incremental level 1 cumulative backup, you issued the following command:RMAN BACKUP INCREMENTAL LEVEL 1 CUMULATIVE DATABASE;Which two statements are true in the above situation?（）A. The block change tracking data will be used only from the next incremental 0 backup.B. The incremental backup will use change tracking data for accomplishing the backup.C. The incremental backup will not use change tracking data for accomplishing the backup.D. The block track file will scan all the blocks and create bitmap for all the blocks backed up in the level 0 backup.
Examinethefollowingcommandusedtoperformincrementallevel0backup：RMANBACKUPINCREMENTALLEVEL0DATABASE；Toenabletheblockchangetracking，aftertheincrementallevel0backupyouissuedthefollowingcommand：SQLALTERDATABASEENABLEBLOCKCHANGETRACKINGUSINGFILE’/mydir/rman_change_track.f’；Toperformincrementallevel1cumulativebackup，youissuedthefollowingcommand：RMANBACKUPINCREMENTALLEVEL1CUMULATIVEDATABASE；Whichtwostatementsaretrueintheabovesituation？（）A.Theblockchangetrackingdatawillbeusedonlyfromthenextincremental0backup.B.Theincrementalbackupwillusechangetrackingdataforaccomplishingthebackup.C.Theincrementalbackupwillnotusechangetrackingdataforaccomplishingthebackup.D.Theblocktrackfilewillscanalltheblocksandcreatebitmapforalltheblocksbackedupinthelevel0backup.
You performed an incremental level 0 backup of a database:RMAN BACKUP INCREMENTAL LEVEL 0 DATABASE;To enable block change tracking after the incremental level 0 backup, you issued this command:SQL ALTER DATABASE ENABLE BLOCK CHANGE TRACKING USING FILE ‘ /mydir/rman_change_track.f’;To perform an incremental level 1 cumulative backup, you issued this command:RMAN BACKUP INCREMENTAL LEVEL 1 CUMULATIVE DATABASE;Which three statements are true?（）A. Backup change tracking will sometimes reduce I/O performed during cumulative incremental backups.B. The change tracking file must always be backed up when you perform a full database backup.C. Block change tracking will always reduce I/O performed during cumulative incremental backups.D. More than one database block may be read by an incremental backup for a change made to a single block.E. The incremental level 1 backup that immediately follows the enabling of block change tracking will not read the change tracking file to discover changed blocks.
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下面哪个函数可以返回逻辑值TRUE（)A．AND(TRUE, TRUE, FALSE)B．OR(TRUE, TRUE, FALSE)C．OR(FALSE, FALSE, FALSE)D．NOT(TRUE)
【单选题】以下命令的输出是什么？grepl（“neeraj”,c（“dheeraj”,”Neeraj”,”neeraj”,”is”,”NEERAJ”))A．["FALSE ","TRUE ","TRUE ","FALSE ",true]B．["FALSE ","TRUE ","TRUE ","FALSE ",false]C．["FALSE ","FALSE ","TRUE ","FALSE ",false]D．None of the above