What is oracle Linked Server

What is Oracle Linked server? is it a part of oracle database administration?please give some brief introduction of Oracle Linked server.
Edited by: 933618 on 18/05/2012 01:51

SQL Server Linked Servers feature lets you access Oracle data and data from other OLE DB/ODBc compatible data sources from SQL Server. Here are the basic steps for setting up an Oracle linked server.
1. Install and Configure the Oracle Client Software
Oracle client software provides the network libraries required to establish connectivity to an Oracle database system.Download the software from http://www.oracle.com/technology/software/products/database/oracle10g/index.html. Install the software on your SQL Server system and configure it by using Oracle Net Configuration Assistant.
2. Create the Linked Server
Create a linked server by using the T-SQL command
EXEC sp_addlinkedserver
'OracleLinkedServer', 'Oracle',
'MSDAORA', 'OracleServer'
The name of the linked server is Oracle-LinkedServer.The second parameter, product name (Oracle),is optional.The third parameter specifies the OLE DB provider. MSDAORA is the name of the Microsoft OLE DB Provider for Oracle.The final required parameter is the data source name, Oracle Server.
3. Add Logins for the Linked Server
Next, provide the SQL Server system with an Oracle login to access the Oracle database by using the sp_addlinkedsrvlogin command
EXEC sp_addlinkedsrvlogin '
OracleLinkedServer ', false,
'SQLuser', 'OracleUser',
'OraclePwd'

Similar Messages

Facing problem in distributed queries over Oracle linked server

Hi,
I have a SQL Server 2005 x64 Standard Edition SP3 instance. On the instance, we had distributed (4 part) queries over an Oracle linked server running fine just a few hours back but now they have starting taking too long. They seem to work fine when OPENQUERY
is used. Now I have a huge number of queries using the same mechanism and is not feasible for me to convert all queries to OPENQUERY, please help in getting this resolved.
Thanks in advance.

Hi Ashutosh,
According to your description, you face performance issues with distributed queries and
it is not feasible for you to convert all queries to
OPENQUERY. To improve the performance, you could follow the solutions below:
1. Make sure that you have a high-speed network between the local server and the linked server.
2. Use driving_site hint. The driving site hint forces query execution to be done at a different site than the initiating instance.
This is done when the remote table is much larger than the local table and you want the work (join, sorting) done remotely to save the back-and-forth network traffic. In the following example, we use the driving_site hint to force the "work"
to be done on the site where the huge table resides:
select /*+DRIVING_SITE(h)*/
ename
from
tiny_table t,
huge_table@remote h
where
t.deptno = h.deptno;
3. Use views. For instance, you could create a view on the remote site referencing the tables and call the remote view via the local view as the following example.
create view local_cust as select * from cust@remote;
4. Use procedural code. In some rare occasions it can be more efficient to replace a distributed query by procedural code, such as a PL/SQL procedure or a precompiler program.
For more information about the process, please refer to the article:
http://www.dba-oracle.com/t_sql_dblink_performance.htm
Regards,
Michelle Li

SQL to Oracle Linked Server

I am trying to create a linked server from SQL2000 to Oracle9i.
i have done followings:
Install Oracle9i client on sql server machine.
Create a tnsname entry for my oracle database.
Created a linked server using following query:
exec sp_addlinkedserver 'ORA_HIPPOCRT',
'Oracle', 'MSDAORA', 'HIPPOCRT'
exec sp_addlinkedsrvlogin 'ORA_HIPPOCRT',
false, NULL, 'HR', 'password'
But when I query the data as follows:
SELECT * FROM ORA_HIPPOCRT..HR.EMPLOYEES
I get following errors:
Server: Msg 7399, Level 16, State 1, Line 1
OLE DB provider 'MSDAORA' reported an error.
[OLE/DB provider returned message: Oracle client and networking components were not found. These components are supplied by Oracle Corporation and are part of the Oracle Version 7.3.3 or later client software installation.
Provider is unable to function until these components are installed.]
OLE DB error trace [OLE/DB Provider 'MSDAORA' IDBInitialize::Initialize returned 0x80004005: ].
What I am doing wrong?

I can get this to work using OPENQUERY() i.e.
select * from OPENQUERY(andyh, 'select * from TRAINDB.LINKEDSERVERDATATYPETEST')
To me though this has bodge written all over it.
Anyone out there with advise for me?
thanks.

Oracle Linked Server problem in SQL Server

I'm using the MS OLE DB Provider for Oracle in my SQL Server linking an Oracle 9i server to the SQL Server 2000 server. I get the following error when I try to execute a query thru the SQL Server Query Analyzer:
[OLE/DB Provider 'MSDAORA' IOpenRowset::OpenRowset returned 0x80004005: ]
I can however define an ODBC connection and use DTS to get to the Oracle database just fine from the SQL Server machine. I need the linked server query to work though since I'll need it for a new application.
Any help is very much appreciated.
Thanks.
Anja

I guess I'll answer my own question. I found that the setting SQL Query Analyzer was set to "Implicit Transactions" in the current connection properties. When I turned that off the query ran fine

TSQL to retrieve Oracle linked server records

We're porting an Oracle system to SQL server and it's not going well...
Our system is a data warehouse that extracts data from an Oracle operational system. In the Oracle version we use database links to access Oracle. On SQL Server we've created a linked server. All OK so far.
When we try to access the linked server in TSQL we have problems:
- select on a four part name does not pass filters to Oracle and our tables are huge
- OPENQUERY works fine but won't let us pass parameters
We therefore seem to be stuck when we want to update SQL server using a single keyed access to Oracle (SQL retrieves the whole table and then filters; we're processing 20,000 records and this is not acceptable!)
I would appreciate any help you can give; I've spent most of the day searching the web for examples where people have this working, but got nowhere... help!
Thanks in advance

tnsping search for an alias in tnsnames.ora. under alias definition it takes HOST and PORT values from ADDRESS.
I'm almost sure the problem is with an alias. Your config means that in your clients' network there is and oracle cluster with at least 2 nodes (127.1.2.3 and 127.1.2.4) configured to balance workload or smth.
Do you have network communications set up only to one node or to both? I think the following steps works in both cases, but it won't balance workload nor failover if you have access to both nodes.
Copy your tnsnames.ora somewhere for backup, then clear its content, copy-paste there a template
YourAlias =
(DESCRIPTION =
    (ADDRESS =
      (PROTOCOL = TCP)
      (HOST = 172.1.2.3)
      (PORT = 1545)
    (CONNECT_DATA =
      (SERVICE_NAME = ServiceNameHere)
and fill it with your alias name, IP address and port (already checked via telnet) and SERVICE_NAME parameter.
If two nodes have different service names, and you don't know each node you connect, try first one, then the second one.
To connect to failover environment you surely need network access to both nodes, but I don't know if its enough - i haven't seen configurations like that.
I did as you instructed and still get TNS-03505: Failed to resolve name. Does it matter that my TNS Ping is version 12.1.0.1.0, and they are on Oracle 11? I wouldn't think so but figured I should ask. Also, is there a way that they could have
disabled tnsping? They are extremely secure, and lock everything down so maybe that's the problem here.
André

What is oracle management server 9i

when i install the oracle database 9i, does management server is installed by default or not? what are the steps required to install management server?
Please anybody put some light on this issue.
Thanks
Ateeq

9i Oracle Management Server is not configured by default. It is an option for using 9i EM
You will find instruction in the Documentation:
<br>
<br>
Oracle Enterprise Manager 9i Configuration Guide
<br>
<br>

WHAT IS ORACLE MANAGEMENT SERVER (OMS)

Hi,
every one,
what is OMS (ORACLE MANAGEMENT SERVER ) ,
Why is it necessary
plz reply me
regards rehan

It functions as a middle tier beteen 'Oracle Intelligent Agents' and management consoles,where DBAs view and control their OEM domain.
You can refer the following for more details:
http://www.lc.leidenuniv.nl/awcourse/oracle/em.920/a96673/ch1.htm

Cannot get data of the row from OLE DB provider "OraOLEDB.Oracle" for linked server

I have created a stored procedure in SQL Server for a report that uses parameters. In the report I am linking an Oracle table. I use a subquery like this to query the Oracle table: (select * from openquery(oracle_linked_server, 'select
partno, description from oracletable')). If I run the subquery it works fine every time. The linked server uses an oracle account which has access to the oracle table. When I first created the Stored Procedure it worked fine for me. When
I test the report, it worked fine. Then I asked another user to test it and it broke with the below error message.
OLE DB provider "OraOLEDB.Oracle" for linked server "XXXX_ORACLE" returned message "ORA-01403: no data found".
Msg 7346, Level 16, State 2, Procedure usp_report_XXXXXX, Line 15
Cannot get the data of the row from the OLE DB provider "OraOLEDB.Oracle" for linked server "XXXX_ORACLE".
Now when I try the report or the stored procedure, I get the same error. I tested the oracle subquery in the stored procedure and it still works. The report uses a service account to execute the stored procedure.
I am using SQL Server 2012 Developer Edition 64 bit (11.0.5058) Management Studio to develop the stored procedure. The SQL Server I am accessing and running the stored procedure is SQL Server 2008R2 Developer Edition 64bit (10.50.2550). The user
that tested the report for me has SQL Server 2008R2 but that shouldn't matter since he is running the report in Internet Explorer.
What is changing that it works for a while and then stops?
Fred
Fred Schmid

I found the answer. It was in the query. I put the TRIM statement on the part# field in the Oracle subquery and took the LTRIM function out of the ON clause that joined my SQL Server table with the Oracle linked server table. Now everything
works. The query looks like this:
SQL_Server_Table sst
LEFT OUTER JOIN
(SELECT * FROM OPENQUERY(OracleLinkedServer, 'SELECT TRIM(partNo) AS partNo, partDesc FROM OracleTable')) ols
ON sst.partNo = ols.partNo
Thanks for pointing me in the right direction.
Fred Schmid

Linked Server :: OLE DB provider "OraOLEDB.Oracle" for linked server "ABC" returned message "New transaction cannot enlist in the specified transaction coordinator. ".

Hello All,
As mentioned in title, i am stuck up with that articular error from last three days,
i have following scenario, my SQL server 2008, my oracle 10g are on both same machine with OS Windows Server 2008.
the following error generated on my management studio when i execute my procedure written in my SQL server. Following is original source code snippet after error massage.
OLE DB provider "OraOLEDB.Oracle" for linked server "ORCL" returned message "New transaction cannot enlist in the specified transaction coordinator. ".
Msg 50000, Level 16, State 2, Procedure PROC_MIGRATE_MST_FRM_ORA_SQLSERVER, Line 43
The operation could not be performed because OLE DB provider "OraOLEDB.Oracle" for linked server "ORCL" was unable to begin a distributed transaction.
BEGIN TRY
-- MIGRATION OF PR_COMPANY_MH START
BEGIN TRANSACTION T1
PRINT 'mILAN NNNNNNNNN 11'
INSERT INTO PROD.PR_COMPANY_MH
SELECT * FROM OPENQUERY(ORCL, 'SELECT * FROM PR_COMPANY_MH WHERE SQL_FLG = ''N'' ')
PRINT 'mILAN NNNNNNNNN 12'
UPDATE OPENQUERY(ORCL, 'SELECT SQL_FLG FROM PR_COMPANY_MH WHERE SQL_FLG = ''N''')
SET SQL_FLG = 'Y'
--EXECUTE ('UPDATE PROD.PR_COMPANY_MH SET SQL_FLG = ''Y'' ') AT [ORCL]
PRINT 'mILAN NNNNNNNNN 13'
COMMIT TRANSACTION T1
-- MIGRATION OF PR_COMPANY_MH END
END TRY
BEGIN CATCH
PRINT 'mILAN NNNNNNNNN 14'
ROLLBACK TRANSACTION T1
PRINT 'mILAN NNNNNNNNN 15'
SELECT
@ErrorNumber = ERROR_NUMBER(),
@ErrorSeverity = ERROR_SEVERITY(),
@ErrorState = ERROR_STATE(),
@ErrorLine = ERROR_LINE(),
@ErrorProcedure = ISNULL(ERROR_PROCEDURE(), '-');
PRINT 'mILAN NNNNNNNNN 16'
SELECT @ErrorMessage = ERROR_MESSAGE();
RAISERROR (@ErrorMessage, @ErrorSeverity, @ErrorState, @ErrorNumber, @ErrorProcedure)
PRINT 'mILAN NNNNNNNNN 17'
END CATCH
this perticular part is raising that error, and i had tried every configuartion on my local machine related to MS DTC.
When i remove my transaction code, its work just fine no exception raise, but when i use then i.e. BEGIN TRAN, COMMITE TRAN, AND ROLLBACK TRAN. its giving me error, other wise its fine.
Please Help or disscus or suggest why my transaction base code is not woking????
thanks in advance.
Regards,
Milan

Sorry again, I am new on any kind of forum, so i am learning now, following is the error massage generated by SQL Server. and its not
an architecture problem, i had just included my complete architecture to be more informative while asking for the solution or suggestion. My real problem is T-SQL, i think and its related to Distributed queries raise in SQL Server in Oracle Link Server.
OLE DB provider "OraOLEDB.Oracle"
for linked server "ORCL" returned message "New transaction cannot enlist in the specified transaction coordinator. ".
Msg 50000, Level 16, State 2, Procedure PROC_MIGRATE_MST_FRM_ORA_SQLSERVER,
Line 43
The operation could not be performed because OLE
DB provider "OraOLEDB.Oracle" for linked server "ORCL" was unable to begin a distributed transaction.

Execute Oracle procedure via Linked server takes very long

Exec ('Begin [procedurename]; End;') at OracleLinkedServer
I used this statement to execute store procedure on Oracle database via linked server. It keeps running and never ends.
However, if I run this procedure Begin [procedurename]; End; in TOAD, it completes in 10s.
This procedure is just simply to merge data between two tables.
Is there any bug or limit on SQL Server Oracle linked server? I am using SQL SERVER 2012 and Oracle 11g client.

See if this link helps you
http://markmal.blogspot.co.il/2008/01/it-is-really-pain-if-you-need-to-call.html
select * from openquery(MYORADB, '{CALL SCOTT.PROC4MS({resultset 25, OUTPUT})}');
SELECT * FROM OPENQUERY(<linked server name>, '{CALL <oracle sp>}')
Best Regards,Uri Dimant SQL Server MVP,
http://sqlblog.com/blogs/uri_dimant/
MS SQL optimization: MS SQL Development and Optimization
MS SQL Consulting:
Large scale of database and data cleansing
Remote DBA Services:
Improves MS SQL Database Performance
SQL Server Integration Services:
Business Intelligence

Error with Linked Server

I am trying to configure a linked server to connect from MS Sqlserver2000 to Oracle.
I am using an Oracle 8i client. Following notes on this website and from microsoft I changed
my registery enteries as follows:
OracleOciLib oci.dll
OracleSqllib orasql8.dll
OracleXalib oraclient.dll
My odbc connection works when tested thru Oracle Network administation but when I try to look at any tables of the linked server (using MS Enterprise Manager) I get the following error:
"Error 7399: OLE DB provider 'OraOleDB.Orcle' reported an error"
This occurs when I use the oracle odbc
When I use the microsoft odbc connector I get:
"Error 7399: OLE DB provider 'ContextProvider.MSDAORA.1' reported an error"
Any ideas.
Thanks in advance.
Patrick

To view tables on an Oracle linked server in Enterprise manager you need to add a security context to use when there is no SQL Server user
It's on the bottom of the "security" tab on the server properties page.

Oracle Management Server

Hi,
I have Oracle8i and tried to work on Export/import/Load. But it asks for Management Servers.
Can anybody tell what is Oracle Management Server and how create and use it ?
Thanks in advance.
Rajesh
null

Rajesh,
Oracle Management Server is one using which one can administer and monitor the database(s) which hav been included in it. It has to be configured using the Enterprise Manager Configuration Assistant. Once configured, services for the same hav to be started and the databases which hav to be monitored and administered can be added into them. The entire management of the database (except database creation) can be done using this server with the help of the Oracle Enterprise Manager tool.

"Oracle Application Server Configuration Assistant" failed, installation...

I have problem to install SOA suite
Indeed it installs and when it come to complete configuration assistants it shows that one of my components failed.
i tried several times to uninstall/install the SOA suite and it failed in the same stage.
can some one give me some hints?
here is the log file enty:
Trying to check if config_order xml is present
The scratch path is =H:\temp\OraInstall2006-11-23_02-08-30AM
The config_order.xml is null
Lowering thread priority for config tool
Starting to execute configuration assistants
Launched configuration assistant 'Oracle Application Server Configuration Assistant'
Tool type is: Optional.
The command being spawned is: 'F:\dev\oracle\OracleAS_10\jdk\bin\java -cp F:\dev\oracle\OracleAS_10\j2ee\home\applications\ascontrol\ascontrol\WEB-INF\lib\ascontrol.jar;F:\dev\oracle\OracleAS_10\j2ee\home\applications\ascontrol\ascontrol\WEB-INF\lib\log4j-core.jar;F:\dev\oracle\OracleAS_10\jlib\oraclepki.jar;F:\dev\oracle\OracleAS_10\jlib\ojmisc.jar; oracle.sysman.ias.studio.installer.ASControlConfigAssistant -sso true -j2eeinstance home -username oc4jadmin -password *Protected value, not to be logged* -oraclehome F:\dev\oracle\OracleAS_10'
Start output from spawned process:
java.lang.NoClassDefFoundError: oracle/sysman/ias/studio/installer/ASControlConfigAssistant
Exception in thread "main"
End output from spawned process.
Configuration assistant "Oracle Application Server Configuration Assistant" failed
java.lang.NoClassDefFoundError: oracle/sysman/ias/studio/installer/ASControlConfigAssistant
Exception in thread "main"
Result code for launching of configuration assistant is: 1
The OUICA command is launched from F:\dev\oracle\OracleAS_10\oui\bin\ouica.bat.-----------------------------------------------------------------------------
*** Starting OUICA ***
Oracle Home set to F:\dev\oracle\OracleAS_10
Configuration directory is set to F:\dev\oracle\OracleAS_10\cfgtoollogs. All xml files under the directory will be processed
-----------------------------------------------------------------------------please tell me what is Oracle Application Server Configuration Assistant and what effect it will have on my server.
thanks

Hi all,
I've found a solution to this problem. So far I've been trying the installation through MSTSC by taking administrative control (through /console option). Later, I tried my luck by installing it through Net Meeting which proved to be successful.
Hope you can try the same and ged rid of the installation issues.

The operation could not be performed because OLE DB provider "OraOLEDB.Oracle" for linked server ...

Our setup is that we have two databases; a SQL Server 2008 database and an Oracle database (11g). I've got the oracle MTS stuff installed and the Oracle MTS Recovery Service is running. I have DTC configured to allow distributed transactions. All access to the Oracle tables takes place via views in the SQL Server database that go against Oracle tables in the linked server.
(With regard to DTC config: Checked-> Network DTC Access, Allow Remote Clients, Allow Inbound, Allow Outbound, Mutual Authentication (tried all 3 options), Enable XA Transactions and Enable SNA LU 6.2 Transactions. DTC logs in as NT AUTHORITY\NetworkService)
Our app is an ASP.NET MVC 4.0 app that calls into a number of WCF services to perform database work. Currently the web app and the WCF service share the same app pool (not sure if it's relevant, but just in case...)
Some of our services are transactional, others are not.
Each WCF service that is transactional has the following attribute on its interface:
[ServiceContract(SessionMode=SessionMode.Required)]
and the following attribute on the method signatures in the interface:
[TransactionFlow(TransactionFlowOption.Allowed)]
and the following attribute on every method implementations:
[OperationBehavior(TransactionScopeRequired = true, TransactionAutoComplete = true)]
In my data access layer, all the transactional methods are set up as follows:
using (IDbConnection conn = DbTools.GetConnection(_configStr, _connStr))
using (IDbCommand cmd = DbTools.GetCommand(conn, "SET XACT_ABORT ON"))
cmd.ExecuteNonQuery();
using (IDbCommand cmd = DbTools.GetCommand(conn, sql))
... Perform actual database work ...
Services that are transactional call transactional DAL code. The idea was to keep the stuff that needs to be transactional (a few cases) separate from the stuff that doesn't need to be transactional (~95% of the cases).
There ought not be cases where transactional and non-transactional WCF methods are called from within a transaction (though I haven't verified this and this may be the cause of my problems. I'm not sure, which is part of why I'm asking here.)
As I mentioned before, in most cases, this all works fine.
Periodically, and I cannot identify what initiates it, I start getting errors. And once they start, pretty much everything starts failing for a while. Eventually things start working again. Not sure why... This is all in a test environment with a single user.
Sometimes the error is:
Unable to start a nested transaction for OLE DB provider "OraOLEDB.Oracle" for linked server "ORACLSERVERNAME". A nested transaction was required because the XACT_ABORT option was set to OFF.
This message, I'm guessing is happening when I have non-transactional stuff within transactions, as I'm not setting XACT_ABORT in the non-transactional code (that's totally doable, if that will fix my issue).
Most often, however, the error is this:
System.Data.SqlClient.SqlException (0x80131904): The operation could not be performed because OLE DB provider "OraOLEDB.Oracle" for linked server "ORACLSERVERNAME" was unable to begin a distributed transaction.
Now, originally we only had transactions on SQL Server tables and that all worked fine. It wasn't until we added transaction support for some of the Oracle tables that things started failing. I know the Oracle transactions work. And as I said, most of the time, everything is just hunky dorey and then sometimes it starts failing and keeps failing for a while until it decides to stop failing and then it all works again.
I noticed that our transactions didn't seem to have a DistributedIdentifier set, so I added the EnsureDistributed() method from this blog post: http://www.make-awesome.com/2010/04/forcibly-creating-a-distributed-net-transaction/
Instead of a hardcoded Guid (which seemed to cause a lot of problems), I have it generating a new Guid for each transaction and that seems to work, but it has not fixed my problem. I'm wondering if the lack of a DistribuedIdentifier is indicative of some other underlying problem. I've never dealt with an environment quite like this before, so I'm not sure what is "normal".
I've also noticed that the DistributedIdentifier doesn't get passed to WCF. From the client, I have a DistributedIdentifier and a LocalIdentifier in Transaction.Current.TransactionInformation. In the WCF server, however there is only a LocalIdentifier set and it is a different Guid from the client side (which makes sense, but I would have expected the DistributedIdentifier to go across).
So I changed the wait the code above works and instead, on the WCF side, I call a method that calls Transaction.Current.EnlistDurable() with the DummyEnlistmentNotification class from the link above (though with a unique Guid for each transaction instead of the hardcoded guid in the link). I now havea DistributedIdentifier on the server-side, but it still doesn't fix the problem.
It appears that when I'm in the midst of transactions failing, even after I shut down IIS, I'm unable to get the DTC service to shutdown and restart. If I go into Component Services and change the security settings, for example, and hit Apply or OK, after a bit of a wait I get a dialgo that says, "Failed ot restart the MS DTC serivce. Please examine the eventlog for further details."
In the eventlog I get a series of events:
1 (from MSDTC): "The MS DTC service is stopping"
2 (From MSSQL$SQLEXPRESS): "The connection has been lost with Microsoft Distributed Transaction Coordinator (MS DTC). Recovery of any in-doubt distributed transactions
involving Microsoft Distributed Transaction Coordinator (MS DTC) will begin once the connection is re-established. This is an informational
message only. No user action is required."
-- Folowed by these 3 identical messages
3 (from MSDTC Client 2): 'MSDTC encountered an error (HR=0x80000171) while attempting to establish a secure connection with system GCOVA38.'
4 (from MSDTC Client 2): 'MSDTC encountered an error (HR=0x80000171) while attempting to establish a secure connection with system GCOVA38.'
5 (from MSDTC Client 2): 'MSDTC encountered an error (HR=0x80000171) while attempting to establish a secure connection with system GCOVA38.'
6 (From MSDTC 2): MSDTC started with the following settings: Security Configuration (OFF = 0 and ON = 1):
Allow Remote Administrator = 0,
Network Clients = 1,
Trasaction Manager Communication:
Allow Inbound Transactions = 1,
Allow Outbound Transactions = 1,
Transaction Internet Protocol (TIP) = 0,
Enable XA Transactions = 1,
Enable SNA LU 6.2 Transactions = 1,
MSDTC Communications Security = Mutual Authentication Required, Account = NT AUTHORITY\NetworkService,
Firewall Exclusion Detected = 0
Transaction Bridge Installed = 0
Filtering Duplicate Events = 1
This makes me wonder if there's something maybe holding a transaction open somewhere?

The statement executed from the sql server. (Installed version sql server 2008 64 bit standard edition SP1 and oracle 11g 64 bit client), DTS enabled
Below is the actual sql statement issued
SET XACT_ABORT ON
BEGIN TRAN
insert into XXX..EUINTGR.UPLOAD_LWP ([ALTID]
          ,[GRANT_FROM],[GRANT_TO],[NO_OF_DAYS],[LEAVENAME],[LEAVEREASON],[FROMHALFTAG]
          ,[TOHALFTAG] ,[UNIT_USER],[UPLOAD_REF_NO],[STATUS],[LOGINID],[AVAILTYPE],[LV_REV_ENTRY])
          values('IS2755','2010-06-01',
'2010-06-01','.5',     'LWOP'     ,'PERSONAL'     ,'F',     'F',     'EUINTGR',
'20101',1,1,0,'ENTRY')
rollback TRAN
OLE DB provider "ORAOLEDB.ORACLE" for linked server "XXX" returned message "New transaction cannot enlist in the specified transaction coordinator. ".
Msg 7391, Level 16, State 2, Line 3
The operation could not be performed because OLE DB provider "ORAOLEDB.ORACLE" for linked server "XXX" was unable to begin a distributed transaction.
Able to execute the above statement successfully without using transaction.We need to run the statement with transaction.

Memory leak issue with link server between SQL Server 2012 and Oracle

Hi,
We are trying to use the linked server feature with SQL Server 2012 to connect SQL server and Oracle database. We are concerned about the existing memory leak issue. For more context please refer to the link.
http://blogs.msdn.com/b/psssql/archive/2009/09/22/if-you-use-linked-server-queries-you-need-to-read-this.aspx
The above link talks about the issues with SQL Server versions 2005 and 2008, not sure if this is still the case in 2012. I could not find any article that talks about if this issue was fixed by Microsoft in later version.
We know that SQL Server process crashes because of the third-party linked server provider which is loaded inside SQL Server process. If the third-party linked server provider is enabled together with the
Allow inprocess option, the SQL Server process crashes when this third-party linked server experiences internal problems.
We wanted to know if this fixed in SQL Server 2012 ?

So your question is more of a information type or are you really facing OOM issue.
There can be two things for OOM
1. There is bug in SQL Server which is causing the issue which might be fixed in 2012
2. The Linked server provider used to connect to Oracle is not upto date and some patch is missing or more recent version is to be used. Did you made sure that you are using latest version.
What is Oracle version you are trying to connect(9i,10g, R2...)
Please mark this reply as answer if it solved your issue or vote as helpful if it helped so that other forum members can benefit from it
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What is oracle Linked Server

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