错误：ORA-31684: Object type USER:"TEST" already exists

解决： 加上参数：exclude跳过指定的对象类型
[oracle@linux5 imp_exp]$ impdp test/oracle exclude=user directory=dump_file_dir dumpfile=scott.dmp nologfile=y remap_schema=scott:test remap_tablespace=users:test

Import: Release 10.2.0.1.0 - Production on Saturday, 12 April, 2014 18:53:13

Copyright (c) 2003, 2005, Oracle. All rights reserved.

Connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, OLAP and Data Mining options
Master table "TEST"."SYS_IMPORT_FULL_01" successfully loaded/unloaded
Starting "TEST"."SYS_IMPORT_FULL_01": test/******** exclude=user directory=dump_file_dir dumpfile=scott.dmp nologfile=y remap_schema=scott:test remap_tablespace=users:test
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/TABLE_DATA
. . imported "TEST"."DEPT" 5.656 KB 4 rows
. . imported "TEST"."EMP" 7.820 KB 14 rows
. . imported "TEST"."SALGRADE" 5.585 KB 5 rows
. . imported "TEST"."BONUS" 0 KB 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 "TEST"."SYS_IMPORT_FULL_01" successfully completed at 18:53:18
目标用户不存在可以有IMPDP自动创建
[oracle@linux5 imp_exp]$ impdp system/oracle directory=dump_file_dir dumpfile=scott.dmp nologfile=y remap_schema=scott:test2

Import: Release 10.2.0.1.0 - Production on Saturday, 12 April, 2014 19:10:32

Copyright (c) 2003, 2005, Oracle. All rights reserved.