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常见数据访问的级别有()
- A、文件级(file level)
- B、异构级(NFS level)
- C、通用级(UFS level)
- D、块级(block level)
参考答案
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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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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 USING FILE ’/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.
考题
You enable block change tracking. You issue the following command: BACKUP INCREMENTAL LEVEL 0 DATABASE; The next day, you issue the following command: BACKUP INCREMENTAL LEVEL 1 CUMULATIVE DATABASE; Which statement about the use of the change tracking file is true?()A、RMAN reads the block change tracking file only when it performs the incremental level 0 backup.B、RMAN reads the block change tracking file when it performs both incremental backups.C、RMAN reads the block change tracking file only when it performs the incremental level 1 backup.D、RMAN does not read the block change tracking file when it performs either incremental backup.
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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 USING FILE '/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.
考题
多选题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 USING FILE '/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?()AThe block change tracking data will be used only from the next incremental 0 backup.BThe incremental backup will use change tracking data for accomplishing the backup.CThe incremental backup will not use change tracking data for accomplishing the backup.DThe block track file will scan all the blocks and create bitmap for all the blocks backed up in the level 0 backup.
考题
多选题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?()ABackup change tracking will sometimes reduce I/O performed during cumulative incremental backups.BThe change tracking file must always be backed up when you perform a full database backup.CBlock change tracking will always reduce I/O performed during cumulative incremental backups.DMore than one database block may be read by an incremental backup for a change made to a single block.EThe incremental level 1 backup that immediately follows the enabling of block change tracking will not read the change tracking file to discover changed blocks.
考题
单选题为了保护隐私数据,对数据元素进行替换的方法是()。A
数据标记化Data TokenizationB
字段级加密Field level encryptionC
行级数加密Row level encryptionD
批量数据哈希Batch hash
考题
单选题以下命令中哪一个命令是配置Cisco 1900系列交换机特权级密码()。A
enable password cisco level 15B
enable password csicoC
enable secret csicoD
enable password level 15
考题
多选题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 USING FILE ’/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?()AThe block change tracking data will be used only from the next incremental 0 backup.BThe incremental backup will use change tracking data for accomplishing the backup.CThe incremental backup will not use change tracking data for accomplishing the backup.DThe block track file will scan all the blocks and create bitmap for all the blocks backed up in the level 0 backup.
考题
单选题You enable block change tracking. You issue the following command: BACKUP INCREMENTAL LEVEL 0 DATABASE; The next day, you issue the following command: BACKUP INCREMENTAL LEVEL 1 CUMULATIVE DATABASE; Which statement about the use of the change tracking file is true?()A
RMAN reads the block change tracking file only when it performs the incremental level 0 backup.B
RMAN reads the block change tracking file when it performs both incremental backups.C
RMAN reads the block change tracking file only when it performs the incremental level 1 backup.D
RMAN does not read the block change tracking file when it performs either incremental backup.
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