Friday, January 9, 2015

Connect Oracle using ODBC 32 bit in 64 bit Windows 7

For some reason I need to build an ODBC connection to Oracle database, the Oracle database version is 11.2.0.2. This turned out to be quite a big challenge. There are several issues during the installation, as usual, Oracle never make things easy. Anyway, here is how:

1. Download Instant Client basic 32 bit and ODBC 32 bit for 11.2.0.2 from here.
2. Extract both zip files you downloaded, put the files in instantclient_11_2 folder into C:\instantclient_11_2\
3. Add C:\instantclient_11_2 into Windows Path
4. Run C:\instantclient_11_2\odbc_install.exe
    You may see a warning from Program Compatibility Assistant says: This program might not be installed correctly. Just ignore it.
5. Goto ODBC 32bit console, tt is not easy to find Windows ODBC 32 bit console, the fastest way is to run C:\Windows\SysWOW64\odbcad32.exe from Start->search
6. If you have ODBC 32bit console open, create a new ODBC connection using Oracle in instantclient_11_2. You will fill the TNS Service Name like this: //host_ip_or_url:port/instance_name.
6. At this point you can test the new ODBC connection, but mostly you will see this error:
    ORA-12705: Cannot access NLS data files or invalid environment specified
The solution was to find the registry key named NLS_LANG under:
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\ORACLE
and rename it to anything else. I put an "x" at the end. This key is left over from a full install of Oracle. The instant client ODBC works properly now.

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