ORA_NLS is an environment variable.
If your system is using multiple versions of Oracle, you must ensure that:
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.
| Oracle version | Environment variable |
|---|---|
| 7.2 | ORA_NLS |
| 7.3 | ORA_NLS32 |
| 8.x, 9.x | ORA_NLS33 |
| 10g | ORA_NLS10 |