如果达到某个阈值，考虑备份日志文件。
If a certain threshold is reached, consider backing up the logging files.
可以轻松地配置系统，使之在日志文件被写满时自动备份日志文件。
You can easily configure your system to automatically backup a log file when it is full.
关闭数据库，备份所有数据以及所有日志和控制文件。
Shut the database down and back up all data and all log and control files.
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