报错如下：
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of allocate command at 10/30/2012 21:56:41
RMAN-03014: implicit resync of recovery catalog failed
RMAN-03009: failure of partial resync command on default channel at 10/30/2012 21:56:41
ORA-17629: Cannot connect to the remote database server
ORA-17627: ORA-01017: invalid username/password; logon denied
ORA-17629: Cannot connect to the remote database server
检查备份日志发现生产端有新加数据文件。没有在生产同步catalog，在同城端备份就报错。
在生产端更新catalog后问题解决。
Rman> resync catalog
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