When there are databases with different nls_lang, you need to change your registry parameters when switching between DBs. Here is a simple way to open a SQL*Plus window to a database with a particular nls_lang without the need to change the registry.
Create a batch file on your desktop for every database with the name SID.bat, and type in these commands:
# this is an example for using sql plus on UTF8 db from a client
set NLS_LANG=AMERICAN_AMERICA.IW8ISO8859P8 o:orawin95binplus80w.exe ps8/ps8@ps8dvlp
# this is an example for using sql plus on WE8ISO8859P1 db from a client
set NLS_LANG=AMERICAN_AMERICA.WE8ISO8859P1 o:orawin95binplus80w.exe ps8/ps8@ps8dvlp
and so on.
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This was first published in May 2002