一旦选定日志记录程序并建立起日志级别之后，就可以开始构建日志消息了。
Once you've chosen the logger and established the logging level, you can start building your log message.
您可以在数据库上启用归档日志记录模式，并开始联机备份数据库以及备份数据库中的一组表空间。
You can enable archive logging mode on the database and start taking online backups of the database as well as backups of a set of table Spaces in the database.
逻辑日志缓冲区是用来存储最后一次备份开始的逻辑日志记录的。
Logical-log buffer is used to store logical log records since last backup.
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