PROD5的结果如下，此时PROD5显示正常
[oracle@oddpc ~]$ export NLS_LANG="SIMPLIFIED CHINESE_CHINA.UTF8" [oracle@oddpc ~]$ sqlplus / as sysdba SQL*Plus: Release 11.2.0.3.0 Production on 星期四 10月 13 15:46:36 2016 Copyright (c) 1982, 2011, Oracle. All rights reserved. 连接到: Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - Production With the Partitioning, OLAP, Data Mining and Real Application Testing options SQL> show parameter db_name NAME TYPE VALUE ------------------------------------ --------------------------------- ------------------------------ db_name string PROD5 SQL> select sysdate from dual; SYSDATE ------------ 13-10月-16 SQL> show parameter lang NAME TYPE VALUE ------------------------------------ --------------------------------- ------------------------------ nls_date_language string SIMPLIFIED CHINESE nls_language string SIMPLIFIED CHINESE<pre>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 AL32UTF8 NLS_CALENDAR GREGORIAN NLS_DATE_FORMAT DD-MON-RR NLS_DATE_LANGUAGE AMERICAN NLS_SORT BINARY NLS_TIME_FORMAT HH.MI.SSXFF AM PARAMETER VALUE ---------------------------------------- ---------------------------------------- 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 11.2.0.3.0 已选择20行。
总结：通过以上的实验可以看出，客户端展现是否乱码是由NLS_LANG决定，发生中文乱码的情况下，首先查看数据库的NLS_CHARACTERSET是否支持中文存储，如果不支持，无论如何设置均无法正常显示中文。Oracle官方文档上给出了各种语言的编码支持如下。
#NLSPG593
Table A-13 Languages and Character Sets Supported by LCSSCAN and GDK
LanguageCharacter SetsArabic
AL16UTF16, AL32UTF8, AR8ISO8859P6, AR8MSWIN1256, UTF8
Bulgarian
AL16UTF16, AL32UTF8, CL8ISO8859P5, CL8MSWIN1251, UTF8
Catalan
AL16UTF16, AL32UTF8, US7ASCII, UTF8, WE8ISO8859P1, WE8ISO8859P15, WE8MSWIN1252
Croatian
AL16UTF16, AL32UTF8, EE8ISO8859P2, EE8MSWIN1250, UTF8
Czech
AL16UTF16, AL32UTF8, EE8ISO8859P2, EE8MSWIN1250, UTF8
Danish
AL16UTF16, AL32UTF8, US7ASCII, UTF8, WE8ISO8859P1, WE8ISO8859P15, WE8MSWIN1252
Dutch
AL16UTF16, AL32UTF8, US7ASCII, UTF8, WE8ISO8859P1, WE8ISO8859P15, WE8MSWIN1252
English
AL16UTF16, AL32UTF8, US7ASCII, UTF8, WE8ISO8859P1, WE8ISO8859P15, WE8MSWIN1252
Estonian
AL16UTF16, AL32UTF8, NEE8IOS8859P4, UTF8
Finnish
AL16UTF16, AL32UTF8, US7ASCII, UTF8, WE8ISO8859P1, WE8ISO8859P15, WE8MSWIN1252
French
AL16UTF16, AL32UTF8, US7ASCII, UTF8, WE8ISO8859P1, WE8ISO8859P15, WE8MSWIN1252
German
AL16UTF16, AL32UTF8, US7ASCII, UTF8, WE8ISO8859P1, WE8ISO8859P15, WE8MSWIN1252
Greek
AL16UTF16, AL32UTF8, EL8ISO8859P7, EL8MSWIN1253, UTF8
Hebrew
AL16UTF16, AL32UTF8, IW8ISO8859P8, IW8MSWIN1255, UTF8
Hindi
AL16UTF16, AL32UTF8, IN8ISCII, UTF8
Hungarian
AL16UTF16, AL32UTF8, EE8ISO8859P2, EE8MSWIN1250, UTF8
Indonesian
AL16UTF16, AL32UTF8, US7ASCII, UTF8, WE8ISO8859P1, WE8ISO8859P15, WE8MSWIN1252
Italian
AL16UTF16, AL32UTF8, US7ASCII, UTF8, WE8ISO8859P1, WE8ISO8859P15, WE8MSWIN1252
Japanese
AL16UTF16, AL32UTF8, ISO2022-JP, JA16EUC, JA16SJIS, UTF8
Korean
AL16UTF16, AL32UTF8, ISO2022-KR, KO16KSC5601, KO16MSWIN949, UTF8
Latvian
AL16UTF16, AL32UTF8, NEE8ISO8859P4, UTF8
Lithuanian
AL16UTF16, AL32UTF8, NEE8ISO8859P4, UTF8
Malay
AL16UTF16, AL32UTF8, US7ASCII, UTF8, WE8ISO8859P1, WE8ISO8859P15, WE8MSWIN1252
Norwegian
AL16UTF16, AL32UTF8, US7ASCII, UTF8, WE8ISO8859P1, WE8ISO8859P15, WE8MSWIN1252
Persian
AL16UTF16, AL32UTF8, AR8MSWIN1256, UTF8
Polish
AL16UTF16, AL32UTF8, EE8ISO8859P2, EE8MSWIN1250, UTF8
Portuguese
AL16UTF16, AL32UTF8, US7ASCII, UTF8, WE8ISO8859P1, WE8ISO8859P15, WE8MSWIN1252
Romanian
AL16UTF16, AL32UTF8, EE8ISO8859P2, EE8MSWIN1250, UTF8
Russian
AL16UTF16, AL32UTF8, CL8ISO8859P5, CL8KOI8R, CL8MSWIN1251, RU8PC866, UTF8
Serbian
AL16UTF16, AL32UTF8, CL8ISO8859P5, CL8MSWIN1251, UTF8
Simplified Chinese
AL16UTF16, AL32UTF8, HZ-GB-2312, UTF8, ZHS16GBK, ZHS16CGB231280
Slovak
AL16UTF16, AL32UTF8, EE8ISO8859P2, EE8MSWIN1250, UTF8
Slovenian
AL16UTF16, AL32UTF8, EE8ISO8859P2, EE8MSWIN1250, UTF8
Spanish
AL16UTF16, AL32UTF8, US7ASCII, UTF8, WE8ISO8859P1, WE8ISO8859P15, WE8MSWIN1252
Swedish
AL16UTF16, AL32UTF8, US7ASCII, UTF8, WE8ISO8859P1, WE8ISO8859P15, WE8MSWIN1252
Thai
AL16UTF16, AL32UTF8, TH8TISASCII, UTF8
Traditional Chinese
AL16UTF16, AL32UTF8, UTF8, ZHT16MSWIN950
Turkish
AL16UTF16, AL32UTF8, TR8MSWIN1254, UTF8, WE8ISO8859P9
Ukranian
AL16UTF16, AL32UTF8, CL8ISO8859P5, CL8MSWIN1251, UTF8
Vietnamese
AL16UTF16, AL32UTF8, VN8VN3, UTF8