【翻译自mos文章】在dg环境中flashback primary database的方法

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本文介绍在Oracle Database 10.1到11.2版本中，如何通过关闭并启动主数据库到装载阶段，使用指定SCN进行闪回主数据库的操作流程，并指导如何同步闪回备用数据库。

在dg环境中flashback primary database的方法

本文的本意是：在flashback了primary database之后，flashback standby database的方法。

参考自：
How To Flashback Primary Database In Standby Configuration (文档 ID 728374.1)

适用于：
Oracle Database - Enterprise Edition - Version 10.1.0.2 to 11.2.0.3 [Release 10.1 to 11.2]
Information in this document applies to any platform.

解决方案：

1. Shutdown primary database .

SQL> SHUTDOWN IMMEDIATE

2. Start primary database in mount stage

SQL> STARTUP MOUNT

3. Flashback primary database to specified scn

SQL> FLASHBACK DATABASE TO SCN <scn_number>;

4. Open primary database with reset logs.

SQL> ALTER DATABASE OPEN RESETLOGS;

5. Cancel media recovery on the standby database (if not already done).

SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE CANCEL;

6. Check current_scn on the standby database, If flashback scn is greater then current_scn then skip next step (step 7).

SQL> SELECT CURRENT_SCN FROM V$DATABASE;

7. Flashback Standby database

SQL> FLASHBACK STANDBY DATABASE TO SCN <scn_number -2>; (on standby database)

8. Start managed recovery on the standby database

SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE DISCONNECT FROM SESSION;

Due to Bug 7516849 and Bug 6967591 Media recovery on physical standby may not work properly after the flashback. In order to avoid these bugs, please recreate the Standby Controlfile using these Notes:

Note 459411.1 : Steps to recreate a Physical Standby Controlfile 

 OR 

Note 734862.1 : Step by step guide on how to recreate standby control file when datafiles are on ASM and using Oracle Managed Files