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.
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.
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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