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ORA_NLS is an environment variable.

If your system is using multiple versions of Oracle, you must ensure that:

• The appropriate ORA_NLS variable is set.
• The corresponding NLS data files for the versions you are using are available.

The location-specific data is stored in a directory specified 4 by the ORA_NLS environment variable. For each new version of Oracle, there is a different ORA_NLS data directory. Oracle ORA_NLS variable that specifies the location of locale-specific data by version.

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