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.

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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.

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这些任务包括轮转日志文件以避免装满文件系统、备份数据和连接时间服务器来执行系统时间同步。

These include rotating log files so filesystems do not become full, backing up data, and connecting to a time server to keep your system time synchronized.

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