闪回数据库能够使你在不恢复数据文件备份的情况下使数据库倒回到先去的某个时间点。

Flashback Database enables you to rewind the database to a previous point in time without restoring backup copies of the datafiles.

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如果空间在闪回区太少了，那么闪回日志应该删一些去释放一些需要的空间通过配置时期策略。结果就是闪回数据库窗口可以比闪回时期的目标时间更短。

If space in the flash recovery area is low, then flashback logs may be deleted to free space for files required by the configured retention policy.

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移除某些因需求储存的暂时数据以简化应用设计。通过闪回查询你可以从数据库中直接获取到过去的数据。

Simplifying the application design, by removing the need to store some kinds of temporal data. By using a Flashback Query, you can retrieve past data directly from the database.

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