Use the RMAN utility to back up the database while the database is offline or online.
在数据库离线或在线的情况下，使用RMAN实用程序备份数据库。
Tuesday uses level 2 and since Monday is at same level, RMAN will back up changes since Monday.
星期二使用级别2，由于星期一处于相同的级别，所以RMAN将备份星期一以后的更改。
By default, RMAN creates backups on disk.
默认情况下，RMAN在磁盘上创建备份。
RMAN queries the metadata and does not actually read the backup files.
RMAN只是查询了原数据，实际上并没有读取备份文件。
Online logs CANNOT be backed up using RMAN; they must be archived first.
联机日志不能用RMAN来备份，必须先将其归档。
If you specify backup incremental, then RMAN creates an incremental backup of a database.
如果你指定了backupincremental，那么RMAN会创建一个数据库的增量备份(incremental backup)。
PREVIEW command to report, but not restore, the backups that RMAN could use to restore to the specified time.
PREVIEW命令来看看RMAN能够用来恢复到指定时间的备份，但是这时还没有进行恢复。
The configuration is persistent and applies to all subsequent operations on this target database, even if you exit and restart RMAN.
在目标数据库上做的后续操作该配置都将永久有效，即使你退出或者重启RMAN。
Moreover, through the RMAN interface, third-party backup and recovery software such as veritas will provide more powerful backup and recovery management.
而且，通过RMAN提供的接口，第三方的备份与恢复软件如veritas将提供更强大的备份与恢复的管理功能。
Recovering with incremental backups requires no additional effort on your part. If incremental backups are available, then RMAN uses them during recovery.
用增量备份进行数据恢复你这边不用做什么事情，如果增量备份可以用，RMAN在恢复的时候就自动用了。
If you run RMAN interactively, and if you do not specify the NOPROMPT option, then DELETE displays a list of files and prompts for confirmation before deleting any file in the list.
如果你以互动式运行RMAN并且没有指定NOPROMPT选项，DELETE命令显示出文件清单，并且在删除文件之前会让你确认是否删除。
If a flash recovery area is enabled, and if you do not specify the FORMAT parameter (see Table 2-1), then RMAN creates backups in the recovery area and automatically gives them unique names.
如果闪回区设置为可用，并且你又没指定FORMAT参数(参见Table2 - 1)，那么RMAN在闪回区创建备份文件，并给备份起一个独一无二的名字。
If a flash recovery area is enabled, and if you do not specify the FORMAT parameter (see Table 2-1), then RMAN creates backups in the recovery area and automatically gives them unique names.
如果闪回区设置为可用，并且你又没指定FORMAT参数(参见Table2 - 1)，那么RMAN在闪回区创建备份文件，并给备份起一个独一无二的名字。
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