在dataguard上，使用rman连接catalog数据库进行备份。备份的时候，rman的日志报错如下：
在dataguard上，使用rman连接catalog数据库进行备份。备份的时候，rman的日志报错如下：
Starting backup at 2014/04/23-10:02:02
archived log /aabb/qb/mobprd/log/fra/mobprd/archivelog/2014_04_23/o1_mf_1_201410_9ofpggpg_.arc not found or out of sync with catalog
skipping inaccessible file /aabb/qb/mobprd/log/fra/mobprd/archivelog/2014_04_23/o1_mf_1_201410_9ofpggpg_.arc
archived log /aabb/qb/mobprd/log/fra/mobprd/archivelog/2014_04_23/o1_mf_1_201411_9ofqblsm_.arc not found or out of sync with catalog
skipping inaccessible file /aabb/qb/mobprd/log/fra/mobprd/archivelog/2014_04_23/o1_mf_1_201411_9ofqblsm_.arc
archived log /aabb/qb/mobprd/log/fra/mobprd/archivelog/2014_04_23/o1_mf_1_201412_9ofr6px7_.arc not found or out of sync with catalog
skipping inaccessible file /aabb/qb/mobprd/log/fra/mobprd/archivelog/2014_04_23/o1_mf_1_201412_9ofr6px7_.arc
archived log /aabb/qb/mobprd/log/fra/mobprd/archivelog/2014_04_23/o1_mf_1_201413_9ofs2v2m_.arc not found or out of sync with catalog
skipping inaccessible file /aabb/qb/mobprd/log/fra/mobprd/archivelog/2014_04_23/o1_mf_1_201413_9ofs2v2m_.arc
RMAN-06061: WARNING: skipping archived log compromises recoverability
released channel: ch00
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of backup command at 04/23/2014 10:02:23
RMAN-00600: internal error, arguments [13200] [] [] [] []
一开始，根据文档：341337.1，以为造成这个报错的原因是，注册在catalog库中的信息，在备份时被调用，由于备份是在dataguard库发起，在dataguard主机上去找对应的路径，就认为归档日志被人为的删除了。因此就报错inaccessible。
建议把生产和dataguard的FRA区设置同一目录。（或者用link指向同一目录），然后在rman中：
1. Resync catalog
2. Crosscheck archivelog all
3. Delete expired archivelog all；
但是后来这样处理后还是继续报错。
最后发现，还是DB_UNIQUE_NAME的问题，由于没有配置DB_UNIQUE_NAME参数，导致连接到CATALOG库备份时，同一个日志文件会出现两个位置，引起备份异常：
题外话：关于DB_UNIQUE_NAME，一些公司为了减轻对生产的压力，选择备份在dataguard上进行，主库是rac+asm，，备库是文件系统。在进行备份的恢复测试时，如果没有设置DB_UNIQUE_NAME，即使备份是文件系统上的文件，但是在restore的时候，会遇到restore去asm的路径的问题，但是这个asm的路径其实是不存在的。
--------------------------------------推荐阅读 --------------------------------------
RMAN 配置归档日志删除策略
Oracle基础教程之通过RMAN复制数据库
RMAN备份策略制定参考内容
RMAN备份学习笔记
Oracle数据库备份加密 RMAN加密
--------------------------------------分割线 --------------------------------------
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