闪回数据归档进程，归档被追踪的表的历史行到闪回数据归档文件里面。
The flashback data archiver process (FBDA)archives historical rows of tracked tables into Flashback Data Archives.
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.
当在被追踪的表上面发生了dml事务的时候，这个进程存储行的前镜像到闪回数据归档里面。
When a transaction containing DML on a tracked table commits, this process stores the pre-image of the rows into the Flashback Data Archive.
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