说明：在dataguard的搭建中，运行rman恢复的时候报错ORA-12528的错误；

脚本如下：RMAN> connect auxiliary sys/oracle@SCMPRD02

解决步骤：

1、检查监听是否启动，脚本：tnsping SCMPRD02

方法一：配置数据库的监听为静态参数步骤：在ORACLE_HOME/network/admin 下面检查是否有listener.ora参数文件，如果没有的话运行netca创建数据库的监听，配置完成的监听文件如下：

LISTENER =

(DESCRIPTION_LIST =

(DESCRIPTION =

(ADDRESS = (PROTOCOL = TCP)(HOST = SCMPRDDB02)(PORT = 1521))

(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))

)

ADR_BASE_LISTENER = /u01/app/oracle

方法二：修改tnsnames.ora文件

SCMPRD02 =
   (DESCRIPTION =
    (ADDRESS =
       (PROTOCOL = TCP)(HOST = WELL)(PORT = 1521))
         (CONNECT_DATA =
         (SERVER = DEDICATED)      (
          SERVICE_NAME = SCMPRD02)
           (UR = A) //增加该备注//
              )
                )

总结：ORA-12528: TNS:listener: all appropriate instances are blocking new connections

Cause:All instances supporting the service requested by the client reported that they were blocking the new connections. This condition may be temporary, such as at instance startup.Action:Attempt the connection again. If error persists, then contact the administrator to check the status of the instances.

因为我们复制数据库只是在nomount下打开，而数据库并没有mount,在11g下所有的监听都是动态监听，而只有在数据库mount以后，PMON进程起来以后，才能动态注册。所以对辅助数据库没有办法注册，只能被锁住。

所以修改数据库的监听为静态监听，或者增加（UR=A)即可解决问题；

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本文作者：JOHN QQ：1916066696 （请备注数据库）

ORACLE技术博客：ORACLE 猎人笔记 http://blog.itpub.net/12679300/

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配置DATAGUARD时报ORA-12528

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