charser problems

I am inporting database on linux box. I have problems with cyrillic characters. The actual data is imported properly but in some of the bodies of the procedures and views instead of normal characters I have ????. Any ideas or someone had similiar problem. Any advice or manuals will be helpfull

Make sure the NLS_LANG environment variable is set to the correct character set for cyrillic.

Windows register:

HKEY_LOCAL_MACHINE>SOFTWARE>ORACLE>
Key: NLS_LANG=????

For Unix, in .profile file add:

NLS_LANG=????
export NLS_LANG