一、问题现象

    今天做了一套数据库的主机及存储迁移，做完之后，改好备份脚本，使用NBU备份时，报出如下的错误：

RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of backup command at 11/22/2017 16:27:26
RMAN-03014: implicit resync of recovery catalog failed
RMAN-06004: ORACLE error from recovery catalog database: RMAN-20001: target database not found in recovery

二、问题解析

    查看RMAN错误，报错原因是在数据库迁移之后，新的数据库没有在recovery catalog中注册。

oracle@C01TEST03:/home/oracle>oerr rman 20001
20001, 1, "target database not found in recovery catalog"
// *Cause: target database is not found in the recovery catalog

// *Action: make sure that the target database is registered in the recovery recovery catalog

三、解决方法

    在数据库所在的server上，进行数据库注册

C01TEST03上：

oracle@C01TEST03:/home/oracle>rman target / catalog RMAN_MTH_C01TEST03_PROD/RMAN_MTH_C01TEST03_PROD@catalog

Recovery Manager: Release 11.2.0.4.0 - Production on Tue Nov 28 10:22:01 2017

Copyright (c) 1982, 2011, Oracle and/or its affiliates.  All rights reserved.

connected to target database: MTH (DBID=3150883311)
connected to recovery catalog database

RMAN>register database;