导入备份文件到数据库 source /home/osyunweidbbak.sql
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.
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.
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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