Oracle DSN and tnsnames

Depend on the software we would like to use the DSN, we choosing accordingly 32 or 64bit. Go to Control Panel > Admin Tools > ODBC Data sources (32bit).

The applications, seeking for DSN they looking always the System DSN tab. Once you press add and choose Oracle in OraClient the Oracle ODBC Driver Configuration form will appear.

The only way to configure a connection that doesnt use the default port (1521) is through DSN via TNS Service Name combo.

By default when installing ORACLE CLIENT, creates the ORACLE_HOME and TNS_ADMIN environment variables (aka Control Panel > System > Advanced System Settings > Environment variables button)

Afterall, by going to a windows explorer window and typing %TNS_ADMIN% and pressing enter, you landing to a folder that tnsnames.ora exists, if not create it!

example :

 

xxxsid2.domain.com = 
 (DESCRIPTION = 
  (ADDRESS_LIST = 
   (ADDRESS = (PROTOCOL = TCP) (HOST = server.domain.com) (PORT = 1556))
    )
    (CONNECT_DATA = 
     (SID = xxxsid2)
    )
   )
   
xxxsid.domain.com = 
 (DESCRIPTION = 
  (ADDRESS_LIST = 
   (ADDRESS = (PROTOCOL = TCP) (HOST = server.domain.com) (PORT = 1554))
    )
    (CONNECT_DATA = 
     (SID = xxxsid)
    )
   )

once we alter the file as we like, need to reload the Oracle ODBC Driver Configuration form, now we can choose via TNS Service Name combo the connection ALIAS (ex. xxxsid.domain.com).

PDF with pictures

ref – http://www.interfaceware.com/manual/odbc_oracle.html
ref – https://www.oracle.com/technetwork/database/features/oci/ic-faq-094177.html
ORAClient – https://www.oracle.com/technetwork/topics/dotnet/downloads/index.html
> Choose “xcopy, NuGet” > 32-bit ODAC 12.1.0.2.4 – 72,617,613 bytes – October 5, 2015
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