Clarification on differences between Gateway and Generic Services

Hi
I am trying to connect an MS SQL Server 7.0 on NT database to Oracle 8.1.7 Release 3.
Can I use the standard Oracle Heteregeneous Services OR do I HAVE to use the Transparent Gateway for SQL Server?
The documentation implies that the standard Hetegeregeous services bundled with 8i allow you to connect to any ODBC data source (although it constantly only makes reference to Access, Foxpro etc).
I have successfully connected to MS Access and MS Project using Oracle Heteregeneous Services but am running into problems connecting to MS SQL 7.0. (I cannot get the 8i listener to recognize the hsodbc service, I get an Ora-12154).
A definitive answer will be most appreciated.
Thanks,
Charles Farnell.
[email protected]

Vira
Thanks for your post. I have listed below my tnsnames.ora (partial), listener.ora (partial), inithsodbc.ora and database link DDL. I found a post on Metalink that says the SQL Server machine has to have the Oracle client installed, if this is the case then that could be my problem. Also, it mentioned the PORT in tnsnames.ora should be set to 1433 (the default port for SQL Server). I have tried 1521 and 1433.
If you could look at these and see if there are any obvious mistakes , I would be most grateful.
ERROR OUTPUT (item is a table in SQL Server)
============
SQL*Plus: Release 8.1.7.0.0 - Production on Mon Apr 8 16:45:16 2002
(c) Copyright 2000 Oracle Corporation. All rights reserved.
Connected to:
Oracle8i Enterprise Edition Release 8.1.7.1.1 - Production
With the Partitioning option
JServer Release 8.1.7.1.1 - Production
SQL> select * from item@hsodbc;
select * from item@hsodbc
ERROR at line 1:
ORA-12154: TNS:could not resolve service name
SQL>
TNSNAMES.ORA
============
hsodbc =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = tcp)(HOST = sqlservermachine)(port=1521))
(CONNECT_DATA =
(SID = hsodbc) <== needs to match the sid in listener.ora.
(HS=OK) <== HS clause goes in the description.
LISTENER.ORA
============
(SID_DESC =
(SID_NAME = hsodbc
(ORACLE_HOME = E:\oracle\ora81)
(PROGRAM = hsodbc)
INITHSODBC.ORA
==============
# This is a sample agent init file that contains the HS parameters that are
# needed for an ODBC Agent.
# HS init parameters
HS_FDS_CONNECT_INFO = sqlservermachine.TRN_770B
HS_FDS_TRACE_LEVEL = 4
HS_FDS_TRACE_FILE_NAME = hsodbc.trc
# Environment variables required for the non-Oracle system
#set <envvar>=<value>
DATABASE LINK
=============
CREATE DATABASE LINK hsodbc
USING 'hsodbc'
SQLNET.ORA
==========
# SQLNET.ORA Network Configuration File: e:\oracle\ora81\network\admin\sqlnet.ora
# Generated by Oracle configuration tools.
#SQLNET.AUTHENTICATION_SERVICES= (NTS)
NAMES.DIRECTORY_PATH= (TNSNAMES, ONAMES, HOSTNAME)

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