The advantages of the archiving of online redo log files

The advantages of the archiving of online redo log files

■ A database backup, with online and archived redo log files, guarantees that you can recover all committed transactions if the operating system or hardware fails.

■ You can recover the database using a backup that was taken while the database was open and being used, if you have a copy of the archived log files that were written while the database was being backed up.
■ You can perform online tablespace backups, and use these backups to restore a tablespace following media failure.

■ You can keep a standby database current with its original database by continuously applying the original archived redo log files to the standby database.

在线重做日志归档文件的优点：

■ 数据库通过在线归档重做日志文件的备份，可以保证在系统或者硬件出现故障的情况下，恢复所有已提交事务。

■ 如果你有一个归档日志文件是数据库正在备份时写入的，你可以在数据库打开并且被使用的情况下使用备份恢复数据库。

■ 你可以执行在线表空间备份，在出现介质故障时使用这些备份来恢复表空间。

■ 当原始数据库正在持续将原始的归档重做日志文件应用到备用数据库时，你可以保持一个备用的当前数据库。