DB2 7.2 There is no available conversion for the Source Code page

The Connection test failed.
[IBM][CLI Driver]SQL0332N There is no available conversion for the Source Code page "1254" to the target code page "874". Reason Code "1".
SQLSTATATE =57017
This error mean your language in client and server does not match.
Change your language by change system locale to match server and restart.

Oracle : Import Export Whole DB

Export
set NLS_LANG=English
exp userid=[oldusername]/[oldpassword]@[sid] grants=no file=[filename].dmp
Import
set NLS_LANG=English
imp [username]/[password] file=[filename].dmp  full=yes

*may u need to grant extra role for import
SQL> grant imp_full_database to [username];