Home Database Mysql Tutorial 监控flashback database的进度

监控flashback database的进度

Jun 07, 2016 pm 04:13 PM
database monitor schedule

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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