源服务器：192.168.0.40

不需要做任何操作,只需要知道数据账号，保持2边字符集一致，注意2边表空间名

目标服务器:192.168.0.30

做如下操作
一、在目标服务器上添加tnsname
在/opt/app/oracle/product/10.2.0/db_1/network/admin/tnsnames.ora配置文件追加如下
remount =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.40)(PORT = 1521))
)
(CONNECT_DATA =
(SID = remount)
)
)

二、以普通用户登陆目标服务器，创建dblink设备；

CREATE public DATABASE LINK dmplinkremount CONNECT TO  remountuser IDENTIFIED BY passwd321 USING 'remount';

三、以管理身份登陆目标服务器，创建directory对象
$ sqlplus / as sysdba
sql> create or replace directory dmpdir as '/opt/app/oracle/dmp';
sql> grant read,write on directory dmpdir to public;
sql> exit;
四、查询2边数据库；看用户那些表空间需要迁移
2边分别执行如下sql；对比表空间
select t.tablespace_name, round(sum(bytes/(1024*1024)),0) ts_size  
  from dba_tablespaces t, dba_data_files d  
  where t.tablespace_name = d.tablespace_name  
  group by t.tablespace_name; 

五、执行导数据操作
impdp localuser/localuserpass directory=dmpdir network_link=dmplinkremount  REMAP_SCHEMA=remountuser:localuser REMAP_TABLESPACE=remount01:localuserspace,INDEXS:localuserspace,EXAMPLE:localuserspace,PERFSTAT:localuserspace logfile=20121031xx.log

参考文档:
http://space.itpub.net/16860121/viewspace-630043