Oracle 字符集小结
(1).Oracle数据库服务器字符集 select * from nls_database_parameters 来源于props$,是表示数据库的字符集。 (2).客户端字符集
(1).Oracle数据库服务器字符集
select * from nls_database_parameters
来源于props$,是表示数据库的字符集。
(2).客户端字符集环境
select * from nls_instance_parameters
其来源于v$parameter,表示客户端的字符集的设置,可能是参数文件,环境变量或者是注册表
(3).会话字符集环境
select * from nls_session_parameters
来源于v$nls_parameters,表示会话自己的设置,可能是会话的环境变量或者是alter session完成,如果会话没有特殊的设置,将与nls_instance_parameters一致。
(4).客户端的字符集要求与服务器一致,,才能正确显示数据库的非Ascii字符。
如果多个设置存在的时候,NLS作用优先级别:Sql function > alter session > 环境变量或注册表 > 参数文件 > 数据库默认参数
expdp字符集设置
SQL> select userenv('language') from dual;
USERENV('LANGUAGE')
----------------------------------------------------
AMERICAN_AMERICA.AL32UTF8
set NLS_LANG=AMERICAN_AMERICA.AL32UTF8
export NLS_LANG=AMERICAN_AMERICA.AL32UTF8
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