IMPDP/EXPDP + network_link的使用
结论：
1 IMPDP+network_link, 直接导入到目标库中（从dblink对应的远端库）
2 EXPDP+network_link,直接将远端库上的数据，导出到本地机器上
+++++++++++++++++++++++++
1 PROD3库是本地库，PROD1库是远端库，在PROD3上建立到PROD1的dblink，通过impdp+dblink，将PROD1库上的数据直接imp到PROD3库上。过程如下：
-- 在PROD3上查询，没有scott用户
SYS@PROD3>select username from dba_users;
USERNAME
------------------------------
OUTLN
SYS
SYSTEM
APPQOSSYS
DBSNMP
DIP
ORACLE_OCM
7 rows selected.
SYS@PROD3>-- 查看scott用户的对象的大小
SYS@PROD1>select sum(bytes/1024/1024) from dba_segments where owner='SCOTT';
SUM(BYTES/1024/1024)
--------------------
.3125--查看scott的对象
SYS@PROD1>select object_name,object_type from dba_objects where owner='SCOTT';
OBJECT_NAME OBJECT_TYPE
-------------------- --------------------
PK_DEPT INDEX
DEPT TABLE
EMP TABLE
PK_EMP INDEX
BONUS TABLE
SALGRADE TABLE
6 rows selected.
-- 将scott用户unlock
SYS@PROD1>alter user scott identified by oracle account unlock;
User altered.
SYS@PROD1>conn scott/oracle
Connected.
SCOTT@PROD1>--在PROD3上导入，
--创建database link .到PROD1
SYS@PROD3>create public database link to_prod1 connect to system identified by oracle using 'PROD1';
Database link created.
-- 创建directory
SYS@PROD3>create directory OCM_DIR as '/home/oracle/OCM_DIR';
Directory created.
-- 导入
[oracle@edbjr2p1 dbs]$ export ORACLE_SID=PROD3
[oracle@edbjr2p1 dbs]$ impdp \'/ as sysdba \' directory=OCM_DIR logfile=imp_to_PROD3.log network_link=to_prod1 schemas=scott
Import: Release 11.2.0.3.0 - Production on Sat Dec 9 15:15:53 2017
Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved.
Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Starting "SYS"."SYS_IMPORT_SCHEMA_01": "/******** AS SYSDBA" directory=OCM_DIR logfile=imp_to_PROD3.log network_link=to_prod1 schemas=scott
Estimate in progress using BLOCKS method...
Processing object type SCHEMA_EXPORT/TABLE/TABLE_DATA
Total estimation using BLOCKS method: 192 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 "SCOTT"."DEPT" 4 rows
. . imported "SCOTT"."EMP" 14 rows
. . imported "SCOTT"."SALGRADE" 5 rows
. . imported "SCOTT"."BONUS" 0 rows
Processing object type SCHEMA_EXPORT/TABLE/INDEX/INDEX
Processing object type SCHEMA_EXPORT/TABLE/CONSTRAINT/CONSTRAINT
Processing object type SCHEMA_EXPORT/TABLE/INDEX/STATISTICS/INDEX_STATISTICS
Processing object type SCHEMA_EXPORT/TABLE/CONSTRAINT/REF_CONSTRAINT
Processing object type SCHEMA_EXPORT/TABLE/STATISTICS/TABLE_STATISTICS
Job "SYS"."SYS_IMPORT_SCHEMA_01" successfully completed at 15:16:59
[oracle@edbjr2p1 dbs]$ -- 简单的验证
SYS@PROD3>select index_name from dba_indexes where owner='SCOTT';
INDEX_NAME
------------------------------
PK_DEPT
PK_EMP
SYS@PROD3>select count(*) from scott.dept
2 union all
3 select count(*) from scott.dept@to_prod1;
COUNT(*)
----------
4
4
SYS@PROD3>2 PROD2 是本地库，PROD3是远程库，在PROD2上使用expdp+network_Link参数，会导出文件，导出的文件是PROD3上的数据对应的文件。也即是说，远程expdp文件到本地了。
-- 在PROD2上创建到PROD3 的dblink to_PROD3
create public database link to_prod3 connect to system identified by oracle using 'PROD3'
SYS@PROD2>create public database link to_prod3 connect to system identified by oracle using 'PROD3'
2 ;
Database link created.-- 导出 好像没有导入到PROD3上，直接到本地了。
/home/oracle/OCM_DIR/expdat.dmpexpdp \'/ as sysdba \' directory=OCM_DIR logfile=exp_from_prod2.log network_link=to_prod3 schemas=SH,OE,HR parallel=2
[oracle@edbjr2p1 dbs]$ expdp \'/ as sysdba \' directory=OCM_DIR logfile=exp_from_prod2.log network_link=to_prod3 schemas=SH,OE,HR parallel=2
Export: Release 11.2.0.3.0 - Production on Sat Dec 9 15:46:54 2017
Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved.
Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Starting "SYS"."SYS_EXPORT_SCHEMA_01": "/******** AS SYSDBA" directory=OCM_DIR logfile=exp_from_prod2.log network_link=to_prod3 schemas=SH,OE,HR parallel=2
Estimate in progress using BLOCKS method...
Total estimation using BLOCKS method: 0 KB
Processing object type SCHEMA_EXPORT/USER
Processing object type SCHEMA_EXPORT/DEFAULT_ROLE
Processing object type SCHEMA_EXPORT/PRE_SCHEMA/PROCACT_SCHEMA
Master table "SYS"."SYS_EXPORT_SCHEMA_01" successfully loaded/unloaded
******************************************************************************
Dump file set for SYS.SYS_EXPORT_SCHEMA_01 is:
/home/oracle/OCM_DIR/expdat.dmp
Job "SYS"."SYS_EXPORT_SCHEMA_01" successfully completed at 15:47:14-- 在HR上创建个表
SYS@PROD3>grant connect,resource,create table to hr;
Grant succeeded.
SYS@PROD3>conn hr/oracle
Connected.
HR@PROD3>create table t (id number);
Table created.
HR@PROD3>insert into t values(1);
1 row created.
HR@PROD3>insert into t values(2);
1 row created.
HR@PROD3>commit;
Commit complete.
HR@PROD3>select * from t;
ID
----------
1
2
HR@PROD3>expdp \'/ as sysdba \' directory=OCM_DIR logfile=exp_from_prod2_1.log network_link=to_prod3 schemas=SH,OE,HR parallel=2
[oracle@edbjr2p1 dbs]$ expdp \'/ as sysdba \' directory=OCM_DIR logfile=exp_from_prod2_1.log network_link=to_prod3 schemas=SH,OE,HR parallel=2
Export: Release 11.2.0.3.0 - Production on Sat Dec 9 15:55:22 2017
Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved.
Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Starting "SYS"."SYS_EXPORT_SCHEMA_01": "/******** AS SYSDBA" directory=OCM_DIR logfile=exp_from_prod2_1.log network_link=to_prod3 schemas=SH,OE,HR parallel=2
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
. . exported "HR"."T" 5.007 KB 2 rows
Master table "SYS"."SYS_EXPORT_SCHEMA_01" successfully loaded/unloaded
******************************************************************************
Dump file set for SYS.SYS_EXPORT_SCHEMA_01 is:
/home/oracle/OCM_DIR/expdat.dmp
Job "SYS"."SYS_EXPORT_SCHEMA_01" successfully completed at 15:55:47
++++++++++++++++++++=
end