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1、问题描述

下午社区的小伙伴提问，DG进行switchovert时报错无法进行切换
操作系统版本：windows 2012r2
数据库版本：11.2.0.4
进行切换时报错如下图所示，提示ORA-19809和ORA-19804

2、问题分析

首先是分析报错ORA-19809和ORA-19804
我这里没有windows环境，就找了套LINUX的环境，直接用oerr查看一下报错
ORA-19809报错原因如下

[oracle@rac1 ~]$ oerr ora 19809
19809, 00000, "limit exceeded for recovery files"
//*Cause: The limit for recovery files specified by the
//        DB_RECOVERY_FILE_DEST_SIZE was exceeded.
// *Action: There are five possible solutions:
//          1) Take frequent backup of recovery area using RMAN.
//          2) Consider changing RMAN retention policy.
//          3) Consider changing RMAN archived log deletion policy.
//          4) Add disk space and increase DB_RECOVERY_FILE_DEST_SIZE.
//          5) Delete files from recovery area using RMAN.

ORA-19804报错原因如下

[oracle@rac1 ~]$ oerr ora 19804
19804, 00000, "cannot reclaim %s bytes disk space from %s limit"
// *Cause: Oracle cannot reclaim disk space of specified bytes from the
//         DB_RECOVERY_FILE_DEST_SIZE limit.
// *Action: There are five possible solutions:
//          1) Take frequent backup of recovery area using RMAN.
//          2) Consider changing RMAN retention policy.
//          3) Consider changing RMAN archived log deletion policy.
//          4) Add disk space and increase DB_RECOVERY_FILE_DEST_SIZE.
//          5) Delete files from recovery area using RMAN.

报错里都提到了DB_RECOVERY_FILE_DEST_SIZE这个参数，建议是释放闪回空间。

3、问题处理

按报错指引，我建议他加大闪回空间，可以临时调大点。
调整完毕后，反馈再次尝试切换没有报错了
 

虽然没看到闪回空间的使用情况，估计大概率时归档大多了。
之后还是建议再检查下闪回空间并进行清理。