可以弄一个和源数据库一样的备份数据库，通过源数据库生成的归档日志文件，把源数据库里的数据同步到备份数据库中。

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

youdao

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.

youdao

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.

youdao