Steps to connect SQL Server to Oracle works but WHY ??

The following steps is what I have to do in order to get SQL Server to talk to an Oracle database.
These steps, for me, work 100% of the time. Any deviation from the following steps will result in failure.
Rebooting the machine didn't make any difference between each of the steps.
My question is why I have to install the client a second time?
All the documentation that I have found at Oracle, Microsoft, or elsewhere state that I only need the InstantClient.
=========================================
Some server I don't have access to
with Oracle Database 11g Enterprise Edition Release 11.1.0.7.0 - 64bit installed
Windows XP SP3 - 32bit
with Microsoft SQL Server 2005 SP3 installed
The following steps are done on the Windows XP machine.
1) install win32_11gR2_client
Select: InstantClient (174.0MB)
Path: C:\Oracle
2) install ODTwithODAC112021
Select: Oracle Data Access Components for Oracle Client
Oracle Base: C:\Oracle
Name: OraClient11g_home1
Path: C:\Oracle\product\11.2.0\client_1
3) Add entries for tnsnames.ora and sqlnet.ora
4) Ensure environmental variable ORACLE_HOME is set to C:\Oracle\product\11.2.0\client_1
5) SQL Server Management Studio
Check "Allow Inprocess" for Oracle Provider OraOLEDB.Oracle
Restart SQL Server
Try to add link to Oracle - fails to connect
"The test connection to the linked server failed."
Additional information:
An exception occurred while executing a Transact-SQL statement or batch.
(Microsoft.SqlServer.ConnectionInfo)
Cannot initialize the data source object of OLE DB Provider "OraOLEDB.Oracle" for linked server "ORACLEDB".
OLE DB provider "OraOLEDB.Oracle" for linked server "ORACLEDB" returned message "".
(Microsoft SQL Server, Error: 7303)
6) install win32_11gR2_client
Select: Administrator (1.02GB)
Oracle Base: C:\Oracle
Software Location: C:\Oracle\product\11.2.0\client_1
7) Ensure environmental variable ORACLE_HOME is set to C:\Oracle\product\11.2.0\client_1
8) Ensure tnsnames.ora and sqlnet.ora still exist and are unchanged.
9) SQL Server Management Studio
Restart SQL Server
Add link to Oracle - Successful

You actually installed the client *3* times there.
I'm fairly sure install Instant client via win32_11gR2_client will not give you oraoledb. ODAC and administrator/runtime will though.
You should only need install ODTwithODAC112021 OR win32_11gR2_client (with runtime or administrator option) and be able to connect using SQLServer.
Greg

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I am working in oracle9i and windows os 32 bit.
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I heard about heterogeneous connectivity ...
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Regs....

Are you trying to connect to SQL Server from your Oracle database (i.e. create a database link in Oracle to SQL Server)? Or are you trying to connect to SQL Server using your Oracle client software (i.e. SQL*Plus)?
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Justin

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I want to connect my SQL Server running on Windows2003 with my oracle database 10g which is also on windows through some odbc which i have also created on my machine running oracle 10g. Can some one guide me with simple steps.

Generally most folks use OLEDB rather than ODBC for that.
If you have Metalink access, check out the following note:
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Hi Experts,
I want's to made connection from Oracle 10g to Ms SQL Server 2000. I made necessary entries in receptive file, but still getting an error...
Setting info .....
*/hs/initMYSQLSERVERDSN.ora*
HS_FDS_CONNECT_INFO = MYSQLSERVERDSN
HS_FDS_TRACE_LEVEL = OFF
LISTENER.ORA
LISTENERMYSQLSERVERDSN =
(ADDRESS_LIST=
(ADDRESS=(PROTOCOL=tcp)(HOST=localhost)(PORT=1522))
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(PROGRAM=hsodbc)
TNSNAME.ORA
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But after createing db link , when i execute query desc spt_datatype_info@mysqlserverdsn;
I am geting an error message in listenermysqlserverdsn.log file
TNS-12518: TNS:listener could not hand off client connection
TNS-12560: TNS:protocol adapter error
Please help me out from this issue.
Thanks in Advance
Mani

You OS ?
I have also done the same.
I did install SQL Server & Oracle on another machine with Windows.
For more pls visit.
http://www.dba-oracle.com/t_heterogeneous_database_connections_sql_server.htm
Aqeel Nawaz

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Hello,
I know there are several threads available to this post but please help me in
*step by step process to follow in connecting 2 servers.
I tried everything in internet but got Connection closed error after tnsping of DNS name. Do i need to run any instance sort of thing in SQL server?
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My
TNS names entry
GSIS =
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(CONNECT_DATA = (SID=GSIS)
(SERVER = DEDICATED)
(HS=OK)
Listener entry
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
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(ADDRESS = (PROTOCOL = TCP)(HOST = COB417147.cob.apac.bosch.com)(PORT = 1522))
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
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(PROGRAM = extproc)
(ENVS = "EXTPROC_DLLS=ONLY:C:\Oracle\app\amk1cob\product\11.2.0\dbhome_1\bin\oraclr11.dll")
(SID_DESC =
(SID_NAME = GSIS)
(ORACLE_HOME = C:\Oracle\app\amk1cob\product\11.2.0\dbhome_1)
(PROGRAM = hsodbc)
and
initGSIS
entry
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# needed for the Database Gateway for ODBC
# HS init parameters
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HS_FDS_TRACE_LEVEL = OFF
# Environment variables required for the non-Oracle system
#set
when tnsping i am getting
TNS connection closed.
I am awfully stuck here.
Please guide..

Status
C:\Oracle\app\amk1cob\product\11.2.0\dbhome_1\BIN>lsnrctl status
LSNRCTL for 32-bit Windows: Version 11.2.0.1.0 - Production on 11-MAY-2012 17:48
:14
Copyright (c) 1991, 2010, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1522)))
STATUS of the LISTENER
Alias LISTENER
Version TNSLSNR for 32-bit Windows: Version 11.2.0.1.0 - Produ
ction
Start Date 11-MAY-2012 17:36:30
Uptime 0 days 0 hr. 11 min. 48 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File C:\Oracle\app\amk1cob\product\11.2.0\dbhome_1\network\
admin\listener.ora
Listener Log File c:\oracle\app\amk1cob\diag\tnslsnr\COB417147\listener\
alert\log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(PIPENAME=\\.\pipe\EXTPROC1522ipc)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=COB417147.cob.apac.bosch.com)(PORT=1
522)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=COB417147.cob.apac.bosch.com)(PORT=8
080))(Presentation=HTTP)(Session=RAW))
Services Summary...
Service "CLRExtProc" has 1 instance(s).
Instance "CLRExtProc", status UNKNOWN, has 1 handler(s) for this service...
Service "GSIS" has 1 instance(s).
Instance "GSIS", status UNKNOWN, has 1 handler(s) for this service...
Service "orcl.cob.apac.bosch.com" has 1 instance(s).
Instance "orcl", status READY, has 1 handler(s) for this service...
Service "orclXDB.cob.apac.bosch.com" has 1 instance(s).
Instance "orcl", status READY, has 1 handler(s) for this service...
The command completed successfully
TNS ping
C:\Oracle\app\amk1cob\product\11.2.0\dbhome_1\BIN>tnsping GSIS
TNS Ping Utility for 32-bit Windows: Version 11.2.0.1.0 - Production on 11-MAY-2
012 18:21:55
Copyright (c) 1997, 2010, Oracle. All rights reserved.
Used parameter files:
C:\Oracle\app\amk1cob\product\11.2.0\dbhome_1\network\admin\sqlnet.ora
Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = 10.1.
1.1)(PORT = 63455)) (CONNECT_DATA = (SID=GSIS)) (HS=OK))
TNS-12537: TNS:connection closed
C:\Oracle\app\amk1cob\product\11.2.0\dbhome_1\BIN>
BTW it is 32-bit machine.
Edited by: 933729 on May 11, 2012 5:57 AM

Steps to change universe database connection from SQL server to Oracle 10

Hi,
we are moving from sql server to Oracle 10.Please let me know the steps and various parameters I should consider while changing universe database connection from SQL server to Oracle 10.
Following are the steps which I assumed :
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I used URL http://www.databasejournal.com/features/oracle/article.php/10893_3442661_2 but its not working.
I was reading note# 561033.1 adn planning to try.
If any one done ,please let me know.

user587327 wrote:
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>
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>
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I am attempting to connect MS SQL Server 2K to an Oracle 9i instance using Microsoft's linked server feature. Both databases are on the same server, a Windows 2K Server. Per Microsoft's documentation, I am to install Oracle Client tools and SQL*Net, and then create a SQL*Net alias to my Oracle instance. Below is the tnsnames.ora and sqlnet.ora files containing the required alias. I create the linked server in MS SQL Server, and specify the below alias as the datasource. For the linked server login I specify the 'SA' account and an ID that I have set up in Oracle along with the password. When I attempt to connect via MS Enterprise Manager, I receive an error that reads "Error 7399: OLE DB Provider 'MSDAORA' reported an error." I can connect to both databases independently, but cannot figure out why the linked server from SQL Server to Oracle is not working. Any help at all on this will be appreciated. If anyone knows of documentation that addresses this will also be appreciated.
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Hi all,
I have an Windows XP OS with SP3.
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Copyright (c) 1997, 2007, Oracle. All rights reserved.
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841683 wrote:
Hi,
I did try and delete my listener.ora and then create a new one..
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Steps to connect SQL Server to Oracle works but WHY ??

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