Oracle DB Link from Oracle to SQL Server

Question

Dear buddies,
I am trying to create a dblink from Oracle to SQL Server.
This is my tnsnames.ora
sq =
(DESCRIPTION=
   (ADDRESS=(PROTOCOL=tcp)(HOST=LOCALHOST)(PORT=1521)
   (CONNECT_DATA=(SID=sq))
   (HS=OK)
)This is my listener
SID_LIST_LISTENER =
  (SID_LIST =
      (SID_DESC =
      (SID_NAME = sq)
      (ORACLE_HOME = D:\oracle\product\10.2.0\db_2)
      (PROGRAM = hsodbc)
LISTENER =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
  )initsq.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 = sq
HS_FDS_TRACE_LEVEL  = OFF
# Environment variables required for the non-Oracle system
#set <envvar>=<value>I have created my System DSN for sq with the appropriate values which works fine when I tested the connection.
These 2 databases are in different servers.
This is how I created the db link in Oracle
create public database link sq
CONNECT TO XXX IDENTIFIED BY "XXX"
using 'sq'
select "Column1"
from "Table1"@'sq';The error I receive is: ORA-01729: database link name expected
When I try to recreate the database link it tells me that: ORA-02011: duplicate database link name
I hope someone could guide me.
Thanks.

Answer 1

C:\Documents and Settings\Administrator>tnsping sq
TNS Ping Utility for 32-bit Windows: Version 10.2.0.4.0 - Production on 16-AUG-2011 14:48:40
Copyright (c) 1997,  2007, Oracle.  All rights reserved.
Used parameter files:
D:\oracle\product\10.2.0\db_2\network\admin\sqlnet.ora
TNS-03505: Failed to resolve name
C:\Documents and Settings\Administrator>