闪回数据库能够使你在不恢复数据文件备份的情况下使数据库倒回到先去的某个时间点。
Flashback Database enables you to rewind the database to a previous point in time without restoring backup copies of the datafiles.
当发出这个命令时，处于联机备份模式的所有数据文件都将被发放检查点SCN。
When this command is issued, all data files that are in the online backup mode will be issued checkpoint SCN.
对于联机备份数据文件，这将导致生成大量的重做日志。
This will result in enormous redo logs to be generated for online backup data files.
本文的后面几节解释与这两个IBMNAS组件相关联的数据文件，以此帮助您制订备份计划。
The following sections of the article explain the data files associated with different IBM NAS components that should assist you in your backup planning.
而且，如果您的确需要进行紧急系统恢复，也不想将宝贵的时间都浪费在寻找系统恢复所需的足够磁盘空间以及再在mksysb备份中清理数据文件系统的过程。
And, if you do need to do an urgent system recovery, you don't want to lose precious time finding large enough disks to restore to and then have to untangle data file systems from your mksysb backup.
与完全备份不一样，您必须恢复所有数据文件，而不只是要恢复选定的数据文件。
Unlike complete recovery, you have to restore all data files, instead of only the selected data files to be recovered.
假如备份了我的应用程序，而不仅是我的私人数据文件，那么可能已经恢复了数据。
Had I backed up my applications, not just my personal data files, I could have recovered the data.
与脱机备份不一样，联机备份只要求备份数据文件和控制文件。
Unlike offline backup, online backup only requires that data files and control files be backed up.
每当数据库的模式发生更改，或者进行像添加或删除数据文件、添加或删除表空间这样的更改时，建议管理员执行脱机备份。
Administrators are advised to do an offline backup whenever the schema of the database changes, or changes are made such as adding or removing data files, and adding or removing of table Spaces.
对于没有处在联机备份模式的那些数据文件，随后的检查点将在它们的文件头中添加scn。
For those data files not in the online backup mode, subsequent checkpoint will increase the SCN in their headers.
备份是严格按照顺序进行的，这意味着在备份了表空间1中的数据文件后，将继续备份表空间2中的数据文件。
The backup is restricted to sequential backup meaning after backing up data files in tablespace1 then go on for data files in tablespace2.
对于备份IBMNAS相关数据，一定要了解各个IBMNAS组件中的各个数据文件，并识别出需要备份的那些文件。
For backing up IBM NAS-related data, it is vital to understand the various data files from different IBM NAS components and to identify which files need to be backed up.
当发出“AlterTablespace ts_nameEndBackup”时，在联机备份数据文件的的文件头中再次记录了检查点scn。
When Alter Tablespace ts_name End backup is issued, again a checkpoint SCN is recorded at the headers of online backup data files.
每晚进行一次联机备份操作，备份所有数据文件、所有归档日志文件、一个控制文件。
Undertake online backup is operated every night, backup place know exactly about STH seizes file of file of file, all file log, a control.
每晚进行一次联机备份操作，备份所有数据文件、所有归档日志文件、一个控制文件。
Undertake online backup is operated every night, backup place know exactly about STH seizes file of file of file, all file log, a control.
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