Linking Oracle with SQL Server

sql-server oracle ora-12154
bokoxev picture bokoxev · Aug 10, 2010 · Viewed 21.7k times · Source

I'm trying to link SQL Server 2005 to an Oracle 10g database. I've installed the Oracle client on the SQL server and validated that I can connect to the Oracle database using both tnsping and sqlplus. When I try to run a query in SQL Server I get the following:

OLE DB provider "OraOLEDB.Oracle" for linked server "ORA_CSSA2APD" returned message "ORA-12154: TNS:could not resolve the connect identifier specified".
Msg 7303, Level 16, State 1, Line 1
Cannot initialize the data source object of OLE DB provider "OraOLEDB.Oracle" for linked server "ORA_CSSA2APD".

Any ideas? I've tried both of the following queries with no luck:

select * from openquery(ORA_CSSA2APD, 'select count(rowid) from eservice_op.agent')

select count(rowid) from ORA_CSSA2APD..eservice_op.agent

Answer

Gary Myers picture Gary Myers · Aug 11, 2010

I suspect an environment setting. That is, your session is picking up the TNSNAMES.ORA file but the session underlying SQL Server is not. I'd check were ORACLE_HOME and, possibly, TNS_ADMIN are being set and pointing to.

Are you able to use the easy connect syntax for the database with the SQL Server connection .

IE replace ORA_CSSA2APD with hostname:1521/service_name

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