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Home/ Questions/Q 6648585
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Editorial Team
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Editorial Team
Asked: May 26, 20262026-05-26T00:40:23+00:00 2026-05-26T00:40:23+00:00

The other day I got this annoying oracle error: ORA-12705: Cannot access NLS data

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The other day I got this annoying oracle error: ORA-12705: Cannot access NLS data files or invalid environment specified. Funny thing I wasn’t trying to access NLS data files

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  1. Editorial Team
    Editorial Team
    2026-05-26T00:40:24+00:00Added an answer on May 26, 2026 at 12:40 am

    There are two possible causes:

    An attempt was made to issue an ALTER SESSION statement with an invalid NLS parameter or value.

    The NLS_LANG environment variable contains an invalid language, territory, or character set.

    Fix:

    Unset the NLS_LANG environment variable

    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”

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