Greek Data becomes Question Marks when passed through a Database Link

Hi All,
We have a 10gR2 sharing a Win32 Server with an MSSQL 2005.
Data transfers between these are set up using an HS Database Link.
All latin data is passing well, however we have some Greek in there and its transformed to question marks on the way.
Measures attempted so far:
1. I've set the NLS_CHARACTERSET of the 10g to AL32UTF8 . Entered non-Latin data manually to the 10g - works fine.
2. I've edited the relevant init.ora file to include the following:
HS_LANGUAGE = AMERICAN.AL32UTF8
HS_NLS_NCHAR = AL32UTF8
3. Restarted the DB and Listener.
Still question marks
Ideas?
Thanks
Tomer

HSODBC was never certified with NVARCHAR data types. Have a look at the Generic Connectivity Administrator's Guide. It list all supported data types and nchar/nvarchar/ntext is not listed. You can select from those data types, but there is no guarantee the content of those datatypes will be fetched correctly. There are no conversation routines that properly convert unicode content.
HSODBC has been desupported 15th of March. I strongly recommend you to use DG4ODBC 11.1.0.7. In addition in DG4ODBC the NVARCHAR/NCHAR functionality has improved a lot.
DG4ODBC V11.1.0.7 needs to be installed into its own Oracle_Home and it can be used with older Oracle database releases like 10.2.0.4 right out of the box; or you have to apply a compatibility patch to your Oracle database releas 9.2.0.8, 10.1.0.5, 10.2.0.3
Edited by: kgronau on Dec 10, 2008 8:42 PM
One thing I forgot to mention is the advantage of using DG4ODBC is it maps the nvarchar to Oracle nvarchar and thus there is no codepage translation required.
But please pay attention; use 11.1.0.7 not the base release 11.1.0.6 as on Windows based operating systems a high/low byte issue was fixed in 11.1.0.7 which is mandatory for NLS support.

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Message was edited by:
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