从未归档联机日志文件的丢失中恢复。
打开数据库并重新设置日志——alterdatabaseopenresetlogs(注意，使用resetlogs打开后将创建联机日志文件)。
Open the database and reset the logs - alter database open resetlogs (Note after opening using resetlogs will create online log files).
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.
在这种情况下，数据库管理器会删除logpath目录中的所有日志文件(包括联机归档日志文件)，分配新的活动日志文件，并且回复到循环日志记录。
In this case, the database manager deletes all log files in the logpath directory (including online archive log files), allocates new active log files, and reverts to circular logging.
在这种情况下，数据库管理器会删除logpath目录中的所有日志文件(包括联机归档日志文件)，分配新的活动日志文件，并且回复到循环日志记录。
In this situation, the database manager deletes all log files in the logpath directory (including online archive log files), allocates new active log files, and reverts to circular logging.
像通过多路复用(放在不同的位置)控制文件使数据库免疫、使用联机重做日志和归档重做日志这样的步骤，都是避免单点故障所必需的。
Steps such as immunizing ther database by multiplexing (putting in different locations) control files, using online redo logs and archiving redo logs are necessary to avoid a single point of failure.
将所有数据文件、控制文件和联机重做日志文件复制到备份媒介。
Copy all data files, control files and online redo logs file to backup media.
联机归档日志：它们是驻留在数据库日志目录(“online”)中、普通数据库活动不再需要的日志文件。
Online archived logs: These are the log files that reside in the database log directory (' online ') and are no longer needed for normal database activity.
如果logretain设置成“Recovery”或者userexit设置成“Yes”(请参阅下一节)，将保留活动日志文件，而且这些文件将变成联机归档日志文件，以便在前滚恢复中使用。
If logretain is set to "recovery" or userexit is set to "Yes" (see below), the active log files will be retained and become online archive log files for use in roll-forward recovery.
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.
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.
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