How to connect to a Sql server from Oracle using db link

Hi All,
Does anybody have any idea about how to connect to a sql server from oracle database using db link to syncronize the data? I need to pull the data from Sql server table to Oracle tables and relay messages back to the sql server.
Thank you,
Praveen.

we have 2 products - DG4MSQL and DG4ODBC.
DG4ODBC is for free and requires a 3rd party ODBC driver and it can connect to any 3rd party database as long as you use a suitable ODBC driver
DG4MSQL is more powerfull as it is designed for MS SQL Server databases and it supports many functions it can directly map to SQL Server equivalents - it can also call remote procedures or participtae in distributed transactions. Please be aware DG4MSQL requires a license - it is not for free.
Check out Metalink and you'll find notes how to configure both products.
For a generic overview:
Note.233876.1 Options for Connecting to Foreign Data Stores and Non-Oracle Databases
And the setup notes:
DG4ODBC
Note.561033.1 How to Setup DG4ODBC on 64bit Unix OS (Linux, Solaris, AIX, HP-UX) :
Note.466225.1 How to Setup DG4ODBC (Oracle Database Gateway for ODBC) on Windows 32bit RDBMS.HS-3-2 :
Note.109730.1 How to setup generic connectivity (HSODBC) for 32 bit Windows (Windows NT, Windows 2000, Windows XP, Windows 2003) V817:
Note.466228.1 How to Setup DG4ODBC on Linux x86 32bit
DG4MSQL
Note.466267.1 How to Setup DG4MSQL (Database Gateway for MS SQL Server) on Windows 32bit
Note.562509.1 How to Setup DG4MSQL (Oracle Database Gateway for MS SQL Server) 64bit Unix OS (Linux, Solaris, AIX,HP-UX)
Note.437374.1 How to Setup DG4MSQL (Oracle Database Gateway for MS SQL Server) Release 11 on Linux

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There are 2 gateway - the commercial Database Gateway for Ms SQl Server which requires a license and the Database Gateway for ODBC which is for free. The license for DG4ODBC is included in your database license. You only need to install a suitable ODBC driver on your Linux box (for example use the MS SQl Server ODBC driver for Linux - details can be found here: http://www.microsoft.com/en-gb/download/details.aspx?id=36437 ). and then configure the gateway using the My Oracle Support Note:
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HI
I NEED TO ACCESS MS SQL SERVER DATABASE FROM ORALCE 10G(OS -WIN XP)
SOLUTION PLZ?
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http://download.oracle.com/docs/cd/B19306_01/gateways.102/b14270/ch2.htm#sthref35
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Accessing SQL Server from ORACLE using Transparent Gateway

So I had downloaded the gateway installer and was following the guide here to set up the Transparent Gateway for SQL Server: http://www.orafusion.com/art_orahs.htm
After I had created the database link, I was prompted the following error when trying to do a simple select statement from the SQL Server DB:
>
ORA-12154: TNS:could not resolve service name
12154. 00000 - "TNS:could not resolve the connect identifier specified"
*Cause:    A connection to a database or other service was requested using
a connect identifier, and the connect identifier specified could not
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configured. For example, if the type of connect identifier used was a
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- If you are using directory naming:
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NAMES.DIRETORY_PATH parameter in the Oracle Net profile
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accessible.
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connect identifier is configured in the directory.
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specifying a fully qualified net service name or a full LDAP DN
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Error at Line: 3 Column: 27
>
Here are my configuration files:
initMSQL.ora
>
HS_FDS_CONNECT_INFO=webdatasvr:1433.InfoWeb
HS_FDS_TRACE_LEVEL=OFF
HS_FDS_RECOVERY_ACCOUNT=RECOVER
HS_FDS_RECOVERY_PWD=RECOVER
>
listener.ora
>
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC=
(GLOBAL_DBNAME=UGCMAC)
(ORACLE_HOME = C:\oracle\product\10.2.0\db_1)
(SID_NAME=UGCMAC)
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = C:\oracle\product\10.2.0\db_1)
(PROGRAM = extproc)
(SID_DESC =
(SID_NAME = MSQL)
(ORACLE_HOME = C:\oracle\product\11.2.0\tg_1)
(PROGRAM = dg4msql)
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0))
(ADDRESS LIST=
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1524))
>
tnsname.ora
>
UGCMAC =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = UGCMAC)
EXTPROC_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0))
(CONNECT_DATA =
(SID = PLSExtProc)
(PRESENTATION = RO)
MSQL=
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1524))
(CONNECT_DATA =
(SID = MSQL)
(HS=OK)
>
Can anyone assist me? thanks!

Hi kgronau,
>
After changing a listener.ora file you need to STOP and START the listener to get the changes loaded. It looks like your listener is not serving the 1524 port which could be related to the fact that you didn't stop/start the listener after you've edited the listener.ora file.
... But as stated earlier - please do not use a 10.2 listener to start an 11g gateway. Instead configure the listener of the gateway home.
>
I did restart my listener under services.msc whenever I make the changes but there are no effect. Please also note that I can only find "OracleOraDb10g_home1TNSListener" under my services.msc. There is no 11.2 Listener. I did install the gateway and the installation was successful as far as I can tell. But perhaps because there's no 11.2 Listerner under my services.msc, could that mean it was a bad installation?
>
Next point is the tnsping you've used is 11.2. You need to make sure that you use the tnsping of the Oracle Database home as the database initiates the gateway connection so the database home tnsnames,ora needs the tns entry for the gateway.
>
My current PATH environment variables setting is as follow: C:\oracle\product\11.2.0\tg_1\bin;C:\oracle\product\10.2.0\db_1\bin; So perhaps, I just need to ensure the 10.2 ORACE home is the first?
>
As a final tip: There are so many web sites explaining how to configure DG4ODBC - many of them are faulty. If you need a reliable configuration, please have a look at "My Oracle Support" => How to Configure DG4ODBC (Oracle Database Gateway for ODBC) on Windows 32bit to Connect to Non-Oracle Databases Post Install     [Document 466225.1]     )
>
Is there a link?
Edited by: omnri on 21-Jul-2011 23:59

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How to connect to a Sql server from Oracle using db link

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