在利用NETWORK_LINK方式导出的时候，出现了这个错误。

详细错误信息如下：

bash-3.00$ expdp yangtk/yangtk directory=d_temp dumpfile=jiangsu.dp network_link=test113 logfile=jiangsu.log tables=cat_org

Export: Release11.1.0.6.0 - 64bit Production on星期二, 16 9月, 2008 17:08:22

Copyright (c) 2003, 2007, Oracle.  All rights reserved.

连接到: Oracle Database11gEnterprise Edition Release11.1.0.6.0 - 64bit Production

With the Partitioning, OLAP, Data Mining and Real Application Testing options

ORA-31631:需要权限

ORA-39149:无法将授权用户链接到非授权用户

检查Oracle的错误手册：

ORA-39149: cannot link privileged user to non-privileged user

Cause: A Data Pump job initiated be a user with EXPORT_FULL_DATABASE/IMPORT_FULL_DATABASE roles specified a network link that did not correspond to a user with equivalent roles on the remote database.

Action: Specify a network link that maps users to identically privileged users in the remote database.

错误描述的比较清楚，不过这个错误很难理解，难道一个权限大的用户不能通过数据库链导出一个权限小的用户。

当然，了解了这个错误的原因，其实问题很容易解决。在本地创建一个新用户，不要授权EXP_FULL_DATABASE/IMP_FULL_DATABASE角色，就可以导出：

bash-3.00$ sqlplus "/ as sysdba"

SQL*Plus: Release11.1.0.6.0 - Production on星期二9月16 16:53:48 2008

Copyright (c) 1982, 2007, Oracle.  All rights reserved.

连接到:

Oracle Database11gEnterprise Edition Release11.1.0.6.0 - 64bit Production

With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL> col grantee format a15

SQL> col granted_role format a15

SQL> select grantee, granted_role from dba_role_privs

2  where grantee = 'YANGTK';

GRANTEE         GRANTED_ROLE

--------------- ---------------

YANGTK          CONNECT

YANGTK          RESOURCE

YANGTK          DBA

SQL> drop user test cascade;

用户�