背景介绍>利用db_link直接pump抽取，减少转储文件集。

前提：   授权>  grant create public database link,create database link to myAccount;  

1.创建dblink

SQL> create database link demob connect to dblink identified by dblink using '(DESCRIPTION =(ADDRESS = (PROTOCOL = TCP)(HOST = 10.100.25.14)(PORT = 1521))(CONNECT_DATA =(SERVER = DEDICATED)(SERVICE_NAME = orcl)))';

Database link created.

参数说明> 

demob --link_name

dblink -- 远程数据库的用户账号与密码

(DESCRIPTION =(ADDRESS = (PROTOCOL = TCP)(HOST = 10.100.25.14)(PORT = 1521))(CONNECT_DATA =(SERVER = DEDICATED)(SERVICE_NAME = orcl)))  -- 远程数据库的tnsnames.ora

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2.使用dblink

SQL> select * from dblink.dblink@demob;

ID
----------
1
2

参数说明

@demob  --dblink_name

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3.远程数据库（要被导出数据库）授权

SQL> grant exp_full_database to dblink;

Grant succeeded.

SQL>grant imp_full_database to dblink;

Grant succeeded.

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4.在导入数据库中创建parfile文件。

[oracle@11g ~]$ pwd
/home/oracle
[oracle@11g ~]$ ls
app database imp.txt oradiag_oracle oraInventory
[oracle@11g ~]$ cat imp.txt
network_link=demob     （db_link的名字）
schemas=dblink            （要被导入用户名）

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5.目标数据库进行导入。

[oracle@11g ~]$ impdp \'sys/oracle as sysdba\' parfile=/home/oracle/imp.txt

Import: Release 11.2.0.1.0 - Production on Fri Oct 17 15:13:07 2014

Copyright (c) 1982, 2009, Oracle and/or its affiliates. All rights reserved.

Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
FLASHBACK automatically enabled to preserve database integrity.
Starting "SYS"."SYS_IMPORT_SCHEMA_01": "sys/******** AS SYSDBA" parfile=/home/oracle/imp.txt 
Estimate in progress using BLOCKS method...
Processing object type SCHEMA_EXPORT/TABLE/TABLE_DATA
Total estimation using BLOCKS method: 64 KB
Processing object type SCHEMA_EXPORT/USER
Processing object type SCHEMA_EXPORT/SYSTEM_GRANT
Processing object type SCHEMA_EXPORT/ROLE_GRANT
Processing object type SCHEMA_EXPORT/DEFAULT_ROLE
Processing object type SCHEMA_EXPORT/PRE_SCHEMA/PROCACT_SCHEMA
Processing object type SCHEMA_EXPORT/TABLE/TABLE
. . imported "DBLINK"."DBLINK" 2 rows
Job "SYS"."SYS_IMPORT_SCHEMA_01" successfully completed at 15:14:05

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6.登录检查

[oracle@11g ~]$ sqlplus dblink/dblink

SQL*Plus: Release 11.2.0.1.0 Production on Fri Oct 17 15:14:46 2014

Copyright (c) 1982, 2009, Oracle. All rights reserved.

Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

成功结束。