监控flashback database 的进度 参考自： HOW TO DETERMINE FLASHBACK DATABASE PROGRESS (文档 ID 1071391.1) 适用于： Oracle Server - Enterprise Edition - Version 10.1.0.2 to 11.2.0.2 [Release 10.1 to 11.2]【本文来自鸿网互联 (http://www.68idc.cn
监控flashback database 的进度参考自：
HOW TO DETERMINE FLASHBACK DATABASE PROGRESS (文档 ID 1071391.1)
适用于：
Oracle Server - Enterprise Edition - Version 10.1.0.2 to 11.2.0.2 [Release 10.1 to 11.2]【本文来自鸿网互联 (http://www.68idc.cn)】
Information in this document applies to any platform.
***Checked for relevance on 26-Oct-2012***
解决方案：
当发出flashback database命令之后，从v$session_longops 视图中是看不到关于flashback database的进度的，从alert里边也看不到进度。
和media recovery 一样，flashback database 会修改 database file的 checkpoint_change#和checkpoint_time，因此，你可以从v$datafile_header视图中查这两列。
flashback database的第一个步骤是使用flashback log 大概的接近指定的scn 或者time。
flashback database的第二个步骤是使用archivelog 来细粒度（fine_grained）接近精确的scn 或者time。
这意味着，当使用flashback log时， checkpoint_change#和 checkpoint_time 将会后退（go backwards）,
当使用细粒度的media recovery（第二个步骤）时， checkpoint_change#和 checkpoint_time 前进（go forward）.
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