将客户端设置为不同的字符集，演示导入/导出可能产生的乱码问题。为什么没有出现乱码
查看一下数据的字符集：
SQL> column value format a30
SQL> select * from nls_database_parameters;
PARAMETER VALUE
------------------------------ ------------------------------
NLS_LANGUAGE AMERICAN
NLS_TERRITORY AMERICA
NLS_CURRENCY $
NLS_ISO_CURRENCY AMERICA
NLS_NUMERIC_CHARACTERS .,
NLS_CHARACTERSET ZHS16GBK
NLS_CALENDAR GREGORIAN
NLS_DATE_FORMAT DD-MON-RR
NLS_DATE_LANGUAGE AMERICAN
NLS_SORT BINARY
NLS_TIME_FORMAT HH.MI.SSXFF AM
NLS_TIMESTAMP_FORMAT DD-MON-RR HH.MI.SSXFF AM
NLS_TIME_TZ_FORMAT HH.MI.SSXFF AM TZR
NLS_TIMESTAMP_TZ_FORMAT DD-MON-RR HH.MI.SSXFF AM TZR
NLS_DUAL_CURRENCY $
NLS_COMP BINARY
NLS_LENGTH_SEMANTICS BYTE
NLS_NCHAR_CONV_EXCP FALSE
NLS_NCHAR_CHARACTERSET AL16UTF16
NLS_RDBMS_VERSION 11.2.0.1.0
已选择20行。
修改客户到的字符集为：set nls_lang=SIMPLIFIED CHINESE_CHINA.US7ASCII
C:\Users\Administrator>set nls_lang=SIMPLIFIED CHINESE_CHINA.US7ASCII
导出scott用户下的t1表的内容，内容如下：
SQL> select * from t1;
NAME
----------
王强
王三
王五
王扣扣
Exp：
C:\Users\Administrator>exp scott/tiger file=d:t1.dmp tables=(t1)
Export: Release 11.2.0.1.0 - Production on ??? 6? 29 16:46:58 2013
Copyright (c) 1982, 2009, Oracle and/or its affiliates. All rights reserved.
???: Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production
With the Partitioning, Oracle Label Security, OLAP, Data Mining,
Oracle Database Vault and Real Application Testing options
??? US7ASCII ???? AL16UTF16 NCHAR ???
????? ZHS16GBK ??? (????????)
??????????????...
. . ????? T1??? 4 ?
EXP-00091: ?????????????
??????, ??????
Imp：
C:\Users\Administrator>imp test/test file=d:t1.dmp full=y
Import: Release 11.2.0.1.0 - Production on ??? 6? 29 16:47:55 2013
Copyright (c) 1982, 2009, Oracle and/or its affiliates. All rights reserved.
???: Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production
With the Partitioning, Oracle Label Security, OLAP, Data Mining,
Oracle Database Vault and Real Application Testing options
??????? EXPORT:V11.02.00 ???????
??: ????? SCOTT ??, ???????
???? US7ASCII ???? AL16UTF16 NCHAR ???????
??????? ZHS16GBK ??? (????????)
. ??? SCOTT ?????? TEST
. ??? SCOTT ?????? TEST
. . ????? "T1"??? 4 ?
IMP-00003: ?? ORACLE ?? 1031
ORA-01031: ????
IMP-00000: ???????
Microsoft Windows [版本 6.1.7601]
版权所有 (c) 2009 Microsoft Corporation。保留所有权利。
C:\Users\Administrator>sqlplus test/test
SQL*Plus: Release 11.2.0.1.0 Production on 星期六 6月 29 16:53:08 2013
Copyright (c) 1982, 2010, Oracle. All rights reserved.
连接到:
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production
With the Partitioning, Oracle Label Security, OLAP, Data Mining,
Oracle Database Vault and Real Application Testing options
SQL> select * from t1;
NAME
----------
王强
王三
王五
王扣扣