Oracle 设置客户端字符集

Setting the NLS_LANG Environment Variable for Oracle Databases

SELECT NLS_LANGUAGE || '_' || NLS_TERRITORY || '.' ||
       NLS_NCHAR_CHARACTERSET AS NLS_LANG
  FROM V$NLS_PARAMETERS
PIVOT(MAX(VALUE)
   FOR PARAMETER IN('NLS_LANGUAGE' AS NLS_LANGUAGE,
                    'NLS_TERRITORY' AS NLS_TERRITORY,
                    'NLS_NCHAR_CHARACTERSET' AS NLS_NCHAR_CHARACTERSET));

变量名：LANG

变量值：zh_CN.GBK

变量名：NLS_LANG

变量值：SIMPLIFIED CHINESE_CHINA.ZHS16GBK

https://docs.oracle.com/cd/E12102_01/books/AnyInstAdm784/AnyInstAdmPreInstall18.html