ORA-12705: Cannot access NLS data files or invalid environment specified解决方法

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原因

安装了多个Oracle相关软件，设置了不同的编码以及账户，安装了多个Oracle Client软件，在登录时可能会选择一个不正确的账户。

官方解释

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For ORA-12705 errors caused by invalid NLS_LANG settings, you need to verify that it is "unset" at the system-level:

• Windows - The NLS_LANG must be unset in the Windows registry (re-named is best).  Look for the NLS_LANG subkey in the registry at \HKEY_LOCAL_MACHINE\SOFTWARE\ORACLE, and rename it.
   
• Linux/UNIX - Here you simply issue the Linux command "unset NLS_LANG"

解决方法

1、按【win + R】，输入regedit，按【Ctrl + F】查找所有NLS_LANG，将其设置为

SIMPLIFIED CHINESE_CHINA.ZHS16GBK

2、环境变量中加入NLS_LANG  值为SIMPLIFIED CHINESE_CHINA.ZHS16GBK 

3、按【win + R】输入cmd， 然后输入

set NLS_LANG=AMERICAN_AMERICA.ZHS16GBK