Oracle数据迁移expdp/impdp

Posted 2020-08-28 花儿与少年

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Oracle数据迁移expdp/impdp目的：指导项目侧自行进行简单的数据泵迁移工作。

本文实验环境：Oracle 11.2.0.4，利用数据库自带的scott示例用户进行试验测试。

1.首先需要创建Directory

2.使用expdp导出用户数据

2.1 只导出scott用户的元数据，且不包含统计信息；
2.2 只导出scott用户的数据；
2.3 只导出scott用户下的emp，dept表及数据；
2.4 只导出scott用户下的emp，dept表结构；
2.5 导出scott用户下所有的内容；
2.6 并行导出scott用户下所有的内容；

3.查询当前用户用到的表空间

特别注意：如果后续要导入的数据库版本低，所有导出命令就需要在后面加一个version=指定版本。
例如11g -> 10g，假设10g具体版本为10.2.0.1，那么就加一个版本的参数version=10.2.0.1。

1. 首先需要创建Directory

这里目录名字定义为"jy"，
若是windows平台，对应系统目录为"E:\\jingyu";

create or replace directory jy as \'E:\\jingyu\';

若是Unix/Linux平台，对应系统目录为"/tmp/jingyu".

create or replace directory jy as \'/tmp/jingyu\';

注意：目录在系统上需要真实存在（mkdir -p /tmp/jingyu），且有访问的权限。
drwxr-xr-x. 2 oracle oinstall 4.0K May 22 16:48 jingyu

2. 使用expdp导出用户数据

2.1 只导出scott用户的元数据，且不包含统计信息；

expdp system directory=jy schemas=scott content=metadata_only exclude=statistics dumpfile=scott_meta.dmp logfile=scott_meta.log

$ expdp system directory=jy schemas=scott content=metadata_only exclude=statistics dumpfile=scott_meta.dmp logfile=scott_meta.log

Export: Release 11.2.0.4.0 - Production on Fri May 22 16:57:59 2015

Copyright (c) 1982, 2011, Oracle and/or its affiliates.  All rights reserved.
Password: 

Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, Automatic Storage Management, OLAP, Data Mining
and Real Application Testing options
Starting "SYSTEM"."SYS_EXPORT_SCHEMA_01":  system/******** directory=jy schemas=scott content=metadata_only exclude=statistics dumpfile=scott_meta.dmp logfile=scott_meta.log 
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
Processing object type SCHEMA_EXPORT/TABLE/GRANT/OWNER_GRANT/OBJECT_GRANT
Processing object type SCHEMA_EXPORT/TABLE/INDEX/INDEX
Processing object type SCHEMA_EXPORT/TABLE/CONSTRAINT/CONSTRAINT
Master table "SYSTEM"."SYS_EXPORT_SCHEMA_01" successfully loaded/unloaded
******************************************************************************
Dump file set for SYSTEM.SYS_EXPORT_SCHEMA_01 is:
  /tmp/jingyu/scott_meta.dmp
Job "SYSTEM"."SYS_EXPORT_SCHEMA_01" successfully completed at Fri May 22 16:58:13 2015 elapsed 0 00:00:11

2.2 只导出scott用户的数据；

expdp system directory=jy schemas=scott content=data_only dumpfile=scott_data.dmp logfile=scott_data.log

$ expdp system directory=jy schemas=scott content=data_only dumpfile=scott_data.dmp logfile=scott_data.log

Export: Release 11.2.0.4.0 - Production on Fri May 22 16:58:47 2015

Copyright (c) 1982, 2011, Oracle and/or its affiliates.  All rights reserved.
Password: 

Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, Automatic Storage Management, OLAP, Data Mining
and Real Application Testing options
Starting "SYSTEM"."SYS_EXPORT_SCHEMA_01":  system/******** directory=jy schemas=scott content=data_only dumpfile=scott_data.dmp logfile=scott_data.log 
Estimate in progress using BLOCKS method...
Processing object type SCHEMA_EXPORT/TABLE/TABLE_DATA
Total estimation using BLOCKS method: 192 KB
. . exported "SCOTT"."DEPT"                              5.929 KB       4 rows
. . exported "SCOTT"."EMP"                               8.484 KB      12 rows
. . exported "SCOTT"."SALGRADE"                          5.859 KB       5 rows
. . exported "SCOTT"."BONUS"                                 0 KB       0 rows
Master table "SYSTEM"."SYS_EXPORT_SCHEMA_01" successfully loaded/unloaded
******************************************************************************
Dump file set for SYSTEM.SYS_EXPORT_SCHEMA_01 is:
  /tmp/jingyu/scott_data.dmp
Job "SYSTEM"."SYS_EXPORT_SCHEMA_01" successfully completed at Fri May 22 16:58:57 2015 elapsed 0 00:00:07

2.3 只导出scott用户下的emp，dept表及数据；

这里如果用scott用户导出，需要注意scott用户对于directory的权限问题：需要dba用户赋予scott用户read,write目录的权限。
即：grant read, write on directory jy to scott;

SQL> grant read, write on directory jy to scott;

Grant succeeded.

expdp scott directory=jy tables=emp,dept dumpfile=scott_emp_dept.dmp logfile=scott_emp_dept.log

$ expdp scott directory=jy tables=emp,dept dumpfile=scott_emp_dept.dmp logfile=scott_emp_dept.log

Export: Release 11.2.0.4.0 - Production on Fri May 22 17:13:55 2015

Copyright (c) 1982, 2011, Oracle and/or its affiliates.  All rights reserved.
Password: 

Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, Automatic Storage Management, OLAP, Data Mining
and Real Application Testing options
Starting "SCOTT"."SYS_EXPORT_TABLE_01":  scott/******** directory=jy tables=emp,dept dumpfile=scott_emp_dept.dmp logfile=scott_emp_dept.log 
Estimate in progress using BLOCKS method...
Processing object type TABLE_EXPORT/TABLE/TABLE_DATA
Total estimation using BLOCKS method: 128 KB
Processing object type TABLE_EXPORT/TABLE/TABLE
Processing object type TABLE_EXPORT/TABLE/GRANT/OWNER_GRANT/OBJECT_GRANT
Processing object type TABLE_EXPORT/TABLE/INDEX/INDEX
Processing object type TABLE_EXPORT/TABLE/CONSTRAINT/CONSTRAINT
Processing object type TABLE_EXPORT/TABLE/INDEX/STATISTICS/INDEX_STATISTICS
Processing object type TABLE_EXPORT/TABLE/STATISTICS/TABLE_STATISTICS
. . exported "SCOTT"."DEPT"                              5.929 KB       4 rows
. . exported "SCOTT"."EMP"                               8.484 KB      12 rows
Master table "SCOTT"."SYS_EXPORT_TABLE_01" successfully loaded/unloaded
******************************************************************************
Dump file set for SCOTT.SYS_EXPORT_TABLE_01 is:
  /tmp/jingyu/scott_emp_dept.dmp
Job "SCOTT"."SYS_EXPORT_TABLE_01" successfully completed at Fri May 22 17:14:04 2015 elapsed 0 00:00:06

2.4 只导出scott用户下的emp，dept表结构；

expdp scott directory=jy tables=emp,dept content=metadata_only dumpfile=scott_emp_dept_meta.dmp logfile=scott_emp_dept_meta.log

$ expdp scott directory=jy tables=emp,dept content=metadata_only dumpfile=scott_emp_dept_meta.dmp logfile=scott_emp_dept_meta.log

Export: Release 11.2.0.4.0 - Production on Fri May 22 17:14:51 2015

Copyright (c) 1982, 2011, Oracle and/or its affiliates.  All rights reserved.
Password: 

Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, Automatic Storage Management, OLAP, Data Mining
and Real Application Testing options
Starting "SCOTT"."SYS_EXPORT_TABLE_01":  scott/******** directory=jy tables=emp,dept content=metadata_only dumpfile=scott_emp_dept_meta.dmp logfile=scott_emp_dept_meta.log 
Processing object type TABLE_EXPORT/TABLE/TABLE
Processing object type TABLE_EXPORT/TABLE/GRANT/OWNER_GRANT/OBJECT_GRANT
Processing object type TABLE_EXPORT/TABLE/INDEX/INDEX
Processing object type TABLE_EXPORT/TABLE/CONSTRAINT/CONSTRAINT
Processing object type TABLE_EXPORT/TABLE/INDEX/STATISTICS/INDEX_STATISTICS
Processing object type TABLE_EXPORT/TABLE/STATISTICS/TABLE_STATISTICS
Master table "SCOTT"."SYS_EXPORT_TABLE_01" successfully loaded/unloaded
******************************************************************************
Dump file set for SCOTT.SYS_EXPORT_TABLE_01 is:
  /tmp/jingyu/scott_emp_dept_meta.dmp
Job "SCOTT"."SYS_EXPORT_TABLE_01" successfully completed at Fri May 22 17:15:01 2015 elapsed 0 00:00:07

2.5 导出scott用户下所有的内容；

expdp system directory=jy schemas=scott dumpfile=scott_all.dmp logfile=scott_all.log

$ expdp system directory=jy schemas=scott dumpfile=scott_all.dmp logfile=scott_all.log

Export: Release 11.2.0.4.0 - Production on Fri May 22 17:15:52 2015

Copyright (c) 1982, 2011, Oracle and/or its affiliates.  All rights reserved.
Password: 

Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, Automatic Storage Management, OLAP, Data Mining
and Real Application Testing options
Starting "SYSTEM"."SYS_EXPORT_SCHEMA_01":  system/******** directory=jy schemas=scott dumpfile=scott_all.dmp logfile=scott_all.log 
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
Processing object type SCHEMA_EXPORT/TABLE/GRANT/OWNER_GRANT/OBJECT_GRANT
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/STATISTICS/TABLE_STATISTICS
. . exported "SCOTT"."DEPT"                              5.929 KB       4 rows
. . exported "SCOTT"."EMP"                               8.484 KB      12 rows
. . exported "SCOTT"."SALGRADE"                          5.859 KB       5 rows
. . exported "SCOTT"."BONUS"                                 0 KB       0 rows
Master table "SYSTEM"."SYS_EXPORT_SCHEMA_01" successfully loaded/unloaded
******************************************************************************
Dump file set for SYSTEM.SYS_EXPORT_SCHEMA_01 is:
  /tmp/jingyu/scott_all.dmp
Job "SYSTEM"."SYS_EXPORT_SCHEMA_01" successfully completed at Fri May 22 17:16:06 2015 elapsed 0 00:00:11

2.6 并行导出scott用户下所有的内容；

expdp system directory=jy schemas=scott dumpfile=scott_all%U.dmp logfile=scott_all.log parallel=2

$ expdp system directory=jy schemas=scott dumpfile=scott_all%U.dmp logfile=scott_all.log parallel=2

Export: Release 11.2.0.4.0 - Production on Fri May 22 16:55:13 2015

Copyright (c) 1982, 2011, Oracle and/or its affiliates.  All rights reserved.
Password: 

Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, Automatic Storage Management, OLAP, Data Mining
and Real Application Testing options
Starting "SYSTEM"."SYS_EXPORT_SCHEMA_01":  system/******** directory=jy schemas=scott dumpfile=scott_all%U.dmp logfile=scott_all.log parallel=2 
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
. . exported "SCOTT"."DEPT"                              5.929 KB       4 rows
. . exported "SCOTT"."EMP"                               8.484 KB      12 rows
. . exported "SCOTT"."SALGRADE"                          5.859 KB       5 rows
. . exported "SCOTT"."BONUS"                                 0 KB       0 rows
Processing object type SCHEMA_EXPORT/PRE_SCHEMA/PROCACT_SCHEMA
Processing object type SCHEMA_EXPORT/TABLE/TABLE
Processing object type SCHEMA_EXPORT/TABLE/GRANT/OWNER_GRANT/OBJECT_GRANT
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/STATISTICS/TABLE_STATISTICS
Master table "SYSTEM"."SYS_EXPORT_SCHEMA_01" successfully loaded/unloaded
******************************************************************************
Dump file set for SYSTEM.SYS_EXPORT_SCHEMA_01 is:
  /tmp/jingyu/scott_all01.dmp
  /tmp/jingyu/scott_all02.dmp
Job "SYSTEM"."SYS_EXPORT_SCHEMA_01" successfully completed at Fri May 22 16:56:12 2015 elapsed 0 00:00:54

3. 查询当前用户用到的表空间

select tablespace_name from user_tables union
select tablespace_name from user_tab_partitions union
select tablespace_name from user_indexes union
select tablespace_name from user_ind_partitions;

impdp导入。

由于我这里的实验环境还是导出的那台主机，所以需要先模拟出一个导入的环境，你实际导入并不需要。

1.删除scott用户；
drop user scott cascade;
2.删除users表空间。
drop tablespace users including contents and datafiles;
可能users表空间是默认的数据库表空间，导致删除失败，只需要更改下再执行删除即可。

select a.property_name, a.property_value from database_properties a where a.property_name like \'%DEFAULT%\';
alter database default tablespace DBS_D_XXX;

这样就模拟出了一个没有users表空间和scott用户的崭新环境。

1. 首先需要创建Directory

这里目录名字定义为"jy"，
若是windows平台，对应系统目录为"E:\\jingyu";

create or replace directory jy as \'E:\\jingyu\';

若是Unix/Linux平台，对应系统目录为"/tmp/jingyu".

create or replace directory jy as \'/tmp/jingyu\';

注意：目录在系统上需要真实存在（mkdir -p /tmp/jingyu），且有访问的权限。
drwxr-xr-x. 2 oracle oinstall 4.0K May 22 16:48 jingyu

2. 创建表空间和用户及赋权

create tablespace users datafile \'+data1\' size 10M autoextend on maxsize 30G;
create user scott identified by tiger default tablespace users;
grant connect, resource to scott;
grant read, write on directory jy to scott;

3. 使用impdp导入用户数据

初始化环境：
初始1：得到删除当前用户下表的SQL：select \'drop table \'||table_name||\' purge;\' from user_tables;
初始2：得到查询当前用户下表的数据量：select \'select count(1) from \'||table_name||\';\' from user_tables;

3.1 导入scott用户的元数据，且不包含统计信息；

impdp system directory=jy dumpfile=scott_meta.dmp logfile=impdp_scott_meta.log

$ impdp system directory=jy dumpfile=scott_meta.dmp logfile=impdp_scott_meta.log

Import: Release 11.2.0.4.0 - Production on Tue May 26 13:36:41 2015

Copyright (c) 1982, 2011, Oracle and/or its affiliates.  All rights reserved.
Password: 

Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, Automatic Storage Management, OLAP, Data Mining
and Real Application Testing options
Master table "SYSTEM"."SYS_IMPORT_FULL_01" successfully loaded/unloaded
Starting "SYSTEM"."SYS_IMPORT_FULL_01":  system/******** directory=jy dumpfile=scott_meta.dmp logfile=impdp_scott_meta.log 
Processing object type SCHEMA_EXPORT/USER
ORA-31684: Object type USER:"SCOTT" already exists
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
Processing object type SCHEMA_EXPORT/TABLE/GRANT/OWNER_GRANT/OBJECT_GRANT
Processing object type SCHEMA_EXPORT/TABLE/INDEX/INDEX
Processing object type SCHEMA_EXPORT/TABLE/CONSTRAINT/CONSTRAINT
Job "SYSTEM"."SYS_IMPORT_FULL_01" completed with 1 error(s) at Tue May 26 13:36:49 2015 elapsed 0 00:00:03

3.2 导入scott用户的数据；

在3.1导入元数据后才可以导入数据。
impdp system directory=jy dumpfile=scott_data.dmp logfile=impdp_scott_data.log

$ impdp system directory=jy dumpfile=scott_data.dmp logfile=impdp_scott_data.log

Import: Release 11.2.0.4.0 - Production on Tue May 26 13:39:15 2015

Copyright (c) 1982, 2011, Oracle and/or its affiliates.  All rights reserved.
Password: 

Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, Automatic Storage Management, OLAP, Data Mining
and Real Application Testing options
Master table "SYSTEM"."SYS_IMPORT_FULL_01" successfully loaded/unloaded
Starting "SYSTEM"."SYS_IMPORT_FULL_01":  system/******** directory=jy dumpfile=scott_data.dmp logfile=impdp_scott_data.log 
Processing object type SCHEMA_EXPORT/TABLE/TABLE_DATA
. . imported "SCOTT"."DEPT"                              5.929 KB       4 rows
. . imported "SCOTT"."EMP"                               8.484 KB      12 rows
. . imported "SCOTT"."SALGRADE"                          5.859 KB       5 rows
. . imported "SCOTT"."BONUS"                                 0 KB       0 rows
Job "SYSTEM"."SYS_IMPORT_FULL_01" successfully completed at Tue May 26 13:39:26 2015 elapsed 0 00:00:07

3.3 只导入scott用户下的emp表及数据；

这里为了演示导入，先初始化删除scott用户下的所有表。

impdp scott directory=jy tables=emp dumpfile=scott_emp_dept.dmp logfile=impdp_scott_emp.log

$ impdp scott directory=jy tables=emp dumpfile=scott_emp_dept.dmp logfile=impdp_scott_emp.log

Import: Release 11.2.0.4.0 - Production on Tue May 26 13:50:51 2015

Copyright (c) 1982, 2011, Oracle and/or its affiliates.  All rights reserved.
Password: 

Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, Automatic Storage Management, OLAP, Data Mining
and Real Application Testing options
Master table "SCOTT"."SYS_IMPORT_TABLE_01" successfully loaded/unloaded
Starting "SCOTT"."SYS_IMPORT_TABLE_01":  scott/******** directory=jy tables=emp dumpfile=scott_emp_dept.dmp logfile=impdp_scott_emp.log 
Processing object type TABLE_EXPORT/TABLE/TABLE
Processing object type TABLE_EXPORT/TABLE/TABLE_DATA
. . imported "SCOTT"."EMP"                               8.484 KB      12 rows
Processing object type TABLE_EXPORT/TABLE/GRANT/OWNER_GRANT/OBJECT_GRANT
Processing object type TABLE_EXPORT/TABLE/INDEX/INDEX
Processing object type TABLE_EXPORT/TABLE/CONSTRAINT/CONSTRAINT
Processing object type TABLE_EXPORT/TABLE/INDEX/STATISTICS/INDEX_STATISTICS
Processing object type TABLE_EXPORT/TABLE/STATISTICS/TABLE_STATISTICS
Job "SCOTT"."SYS_IMPORT_TABLE_01" successfully completed at Tue May 26 13:50:59 2015 elapsed 0 00:00:03

3.4 只导入scott用户下的emp,dept表结构；

这里为了演示导入，先初始化删除scott用户下的所有表。

impdp scott directory=jy tables=emp,dept dumpfile=scott_emp_dept_meta.dmp logfile=impdp_scott_emp_dept_meta.log

$ impdp scott directory=jy tables=emp,dept dumpfile=scott_emp_dept_meta.dmp logfile=impdp_scott_emp_dept_meta.log

Import: Release 11.2.0.4.0 - Production on Tue May 26 13:54:38 2015

Copyright (c) 1982, 2011, Oracle and/or its affiliates.  All rights reserved.
Password: 

Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, Automatic Storage Management, OLAP, Data Mining
and Real Application Testing options
Master table "SCOTT"."SYS_IMPORT_TABLE_01" successfully loaded/unloaded
Starting "SCOTT"."SYS_IMPORT_TABLE_01":  scott/******** directory=jy tables=emp,dept dumpfile=scott_emp_dept_meta.dmp logfile=impdp_scott_emp_dept_meta.log 
Processing object type TABLE_EXPORT/TABLE/TABLE
Processing object type TABLE_EXPORT/TABLE/GRANT/OWNER_GRANT/OBJECT_GRANT
Processing object type TABLE_EXPORT/TABLE/INDEX/INDEX
Processing object type TABLE_EXPORT/TABLE/CONSTRAINT/CONSTRAINT
Processing object type TABLE_EXPORT/TABLE/INDEX/STATISTICS/INDEX_STATISTICS
Processing object type TABLE_EXPORT/TABLE/STATISTICS/TABLE_STATISTICS
Job "SCOTT"."SYS_IMPORT_TABLE_01" successfully completed at Tue May 26 13:54:45 2015 elapsed 0 00:00:03

由于导出就是emp,dept两张表，所以也可以不指定tables，以下两种写法在这里都是可以的：
impdp scott directory=jy dumpfile=scott_emp_dept_meta.dmp logfile=impdp_scott_emp_dept_meta.log

impdp scott directory=jy dumpfile=scott_emp_dept_meta.dmp logfile=impdp_scott_emp_dept_meta.log full=y

3.5 导入scott用户下所有的内容；

impdp system directory=jy schemas=scott dumpfile=scott_all.dmp logfile=impdp_scott_all.log

如果是在2.4基础上直接导入，会因为emp,dept表已经存在导致导入过程中会由于table_exists_action参数的默认选项是skip，从而跳过emp，dept表数据的导入，如下：

$ impdp system directory=jy schemas=scott dumpfile=scott_all.dmp logfile=impdp_scott_all.log

Import: Release 11.2.0.4.0 - Production on Tue May 26 14:22:50 2015

Copyright (c) 1982, 2011, Oracle and/or its affiliates.  All rights reserved.
Password: 

Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, Automatic Storage Management, OLAP, Data Mining
and Real Application Testing options
Master table "SYSTEM"."SYS_IMPORT_SCHEMA_01" successfully loaded/unloaded
Starting "SYSTEM"."SYS_IMPORT_SCHEMA_01":  system/******** directory=jy schemas=scott dumpfile=scott_all.dmp logfile=impdp_scott_all.log 
Processing object type SCHEMA_EXPORT/USER
ORA-31684: Object type USER:"SCOTT" already exists
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
ORA-39151: Table "SCOTT"."DEPT" exists. All dependent metadata and data will be skipped due to table_exists_action of skip
ORA-39151: Table "SCOTT"."EMP" exists. All dependent metadata and data will be skipped due to table_exists_action of skip
Processing object type SCHEMA_EXPORT/TABLE/TABLE_DATA
. . imported "SCOTT"."SALGRADE"                          5.859 KB       5 rows
. . imported "SCOTT"."BONUS"                                 0 KB       0 rows
Processing object type SCHEMA_EXPORT/TABLE/GRANT/OWNER_GRANT/OBJECT_GRANT
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/STATISTICS/TABLE_STATISTICS
Job "SYSTEM"."SYS_IMPORT_SCHEMA_01" completed with 3 error(s) at Tue May 26 14:22:57 2015 elapsed 0 00:00:03

所以这时我们想导入这些数据，可以加参数 table_exists_action，指定想要的选项。
TABLE_EXISTS_ACTION
Action to take if imported object already exists.
Valid keywords are: APPEND, REPLACE, [SKIP] and TRUNCATE.

这里选择truncate，即如果表存在，那么处理方式是truncate此表后导入文件中包含的数据。
impdp system directory=jy schemas=scott table_exists_action=truncate dumpfile=scott_all.dmp logfile=impdp_scott_all.log

$ impdp system directory=jy schemas=scott table_exists_action=truncate dumpfile=scott_all.dmp logfile=impdp_scott_all.log

Import: Release 11.2.0.4.0 - Production on Tue May 26 14:26:09 2015

Copyright (c) 1982, 2011, Oracle and/or its affiliates.  All rights reserved.
Password: 

Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, Automatic Storage Management, OLAP, Data Mining
and Real Application Testing options
Master table "SYSTEM"."SYS_IMPORT_SCHEMA_01" successfully loaded/unloaded
Starting "SYSTEM"."SYS_IMPORT_SCHEMA_01":  system/******** directory=jy schemas=scott table_exists_action=truncate dumpfile=scott_all.dmp logfile=impdp_scott_all.log 
Processing object type SCHEMA_EXPORT/USER
ORA-31684: Object type USER:"SCOTT" already exists
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
Table "SCOTT"."DEPT" exists and has been truncated. Data will be loaded but all dependent metadata will be skipped due to table_exists_action of truncate
Table "SCOTT"."BONUS" exists and has been truncated. Data will be loaded but all dependent metadata will be skipped due to table_exists_action of truncate
Table "SCOTT"."SALGRADE" exists and has been truncated. Data will be loaded but all dependent metadata will be skipped due to table_exists_action of truncate
Table "SCOTT"."EMP" exists and has been truncated. Data will be loaded but all dependent metadata will be skipped due to table_exists_action of truncate
Processing object type SCHEMA_EXPORT/TABLE/TABLE_DATA
. . imported "SCOTT"."DEPT"                              5.929 KB       4 rows
. . imported "SCOTT"."EMP"                               8.484 KB      12 rows
. . imported "SCOTT"."SALGRADE"                          5.859 KB       5 rows
. . imported "SCOTT"."BONUS"                                 0 KB       0 rows
Processing object type SCHEMA_EXPORT/TABLE/GRANT/OWNER_GRANT/OBJECT_GRANT
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/STATISTICS/TABLE_STATISTICS
Job "SYSTEM"."SYS_IMPORT_SCHEMA_01" completed with 1 error(s) at Tue May 26 14:26:17 2015 elapsed 0 00:00:04

注意：如果这里选用append选项，那么如果原表有数据，且没有合理的约束条件，则可能导致数据的重复导入，所以，生产环境实际导入过程中一定要弄清楚数据的实际情况才能准确决定如何选用此参数的选项。
如下所示，SALGRADE表会出现5条重复数据：
impdp system directory=jy schemas=scott table_exists_action=append dumpfile=scott_all.dmp logfile=impdp_scott_all.log

$ impdp system directory=jy schemas=scott table_exists_action=append dumpfile=scott_all.dmp logfile=impdp_scott_all.log

Import: Release 11.2.0.4.0 - Production on Tue May 26 14:28:27 2015

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