Connection Factory class for Distributed Transaction?

Definition of Managed Datasources goes like this at URL: http://download.oracle.com/docs/cd/B31017_01/web.1013/b28958/datasrc.htm#CHDDADCE
Managed data sources are managed by OC4J. This means that OC4J provides critical system infrastructure such as global transaction management, connection pooling, and error handling.
In the same document, I could also see a section for configuring Connection Pool, that uses 'factory-class' as 'oracle.jdbc.pool.OracleDataSource' as shown below:
<connection-pool name="myConnectionPool">
<connection-factory
factory-class="oracle.jdbc.pool.OracleDataSource"
user="scott"
password="tiger"
This configuration has worked well for my web application where I was using a single instance of Oracle database. In a new application I've to use two separate instance of Oracle databases and there is a need of distributed transaction.
I know, I've to create two separate datasources for the two separate Oracle instances.
My question is: Since now my transaction will be distributed in nature, do I need to use any other factory-class for configuring XA aware Datasources on OC4J? Or whether the same factory-class (oracle.jdbc.pool.OracleDataSource) will work even for distributed transactions?

Here is the link for using Oracle RAC with WLS
http://e-docs.bea.com/wls/docs81/jdbc/oracle_rac.html

Similar Messages

Error connecting SQL Azure - Network access for Distributed Transaction Manager (MSDTC) has been disabled

Sometimes I have an error connecting SQL Azure. The error occurs in an asp.net application and in a windows service running on VM in Azure. Error details:
System.Data.Entity.Core.EntityException: The underlying provider failed on Open. ---> System.Transactions.TransactionManagerCommunicationException: Network access for Distributed Transaction Manager (MSDTC) has been disabled. Please enable DTC for network
access in the security configuration for MSDTC using the Component Services Administrative tool. ---> System.Runtime.InteropServices.COMException: The transaction manager has disabled its support for remote/network transactions. (Exception from HRESULT:
0x8004D024)
   at System.Transactions.Oletx.IDtcProxyShimFactory.ReceiveTransaction(UInt32 propgationTokenSize, Byte[] propgationToken, IntPtr managedIdentifier, Guid& transactionIdentifier, OletxTransactionIsolationLevel& isolationLevel,
ITransactionShim& transactionShim)
   at System.Transactions.TransactionInterop.GetOletxTransactionFromTransmitterPropigationToken(Byte[] propagationToken)
   --- End of inner exception stack trace ---
   at System.Transactions.Oletx.OletxTransactionManager.ProxyException(COMException comException)
   at System.Transactions.TransactionInterop.GetOletxTransactionFromTransmitterPropigationToken(Byte[] propagationToken)
   at System.Transactions.TransactionStatePSPEOperation.PSPEPromote(InternalTransaction tx)
   at System.Transactions.TransactionStateDelegatedBase.EnterState(InternalTransaction tx)
   at System.Transactions.EnlistableStates.Promote(InternalTransaction tx)
   at System.Transactions.Transaction.Promote()
   at System.Transactions.TransactionInterop.ConvertToOletxTransaction(Transaction transaction)
   at System.Transactions.TransactionInterop.GetExportCookie(Transaction transaction, Byte[] whereabouts)
   at System.Data.SqlClient.SqlInternalConnection.EnlistNonNull(Transaction tx)
   at System.Data.ProviderBase.DbConnectionPool.PrepareConnection(DbConnection owningObject, DbConnectionInternal obj, Transaction transaction)
   at System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, UInt32 waitForMultipleObjectsTimeout, Boolean allowCreate, Boolean onlyOneCheckConnection, DbConnectionOptions userOptions, DbConnectionInternal&
connection)
   at System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection)
   at System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal oldConnection, DbConnectionInternal& connection)
   at System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions)
   at System.Data.SqlClient.SqlConnection.TryOpenInner(TaskCompletionSource`1 retry)
   at System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry)
   at System.Data.SqlClient.SqlConnection.Open()
   at System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.<>c__DisplayClass1.<Execute>b__0()
   at System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute[TResult](Func`1 operation)
   at System.Data.Entity.Core.EntityClient.EntityConnection.Open()
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Hello,
I am not an expert in MSDTC but as we know,SQL Azure Database does not support
distributed transactions. This means that SQL Azure doesn’t allow Microsoft Distributed Transaction Coordinator (MS DTC) to delegate distributed transaction handling.
One common cause of MSDTC getting involved in Entity Framework applications is the fact that we close and reopen the same connection as needed (i.e. for each query that is executed).To avoid the stack from opening and closing the connection multiple times,
you can simply open the connection explicitly and run the queries in the same connectio.
The following thread is about a similar issue, please refer to:
http://answers.flyppdevportal.com/categories/azure/sqlazure.aspx?ID=d705a8cf-cba4-494c-96f6-96a136bd29e3
What's more, you can also try the workaround that involves setting the Enlist option of the SQL Azure connection to false. For the detail explanation, please refer to:Entity
FrameWork and SQL Azure
Regards,
Fanny Liu
Fanny Liu
TechNet Community Support

The connection factory name for jobs must be "JobQueueFactory

Hi Experts
Can you plase help me to reslove this issue
Caused by: com.sap.engine.services.deploy.container.DeploymentException: Deployment of jobs in application [backgrounjobear] failed, reason is : [Job "BackGroundJob" of bean "BackGroundJob" does not have a connection factory name. The connection factory name for jobs must be "JobQueueFactory".]
while depling MessageDrivenBean 3.0 getting this.
Any help would Greatly appricated.
Thanks
AB

Hi All,
I am also getting similar error i.e.
Job "TestScheduler" of bean "TestScheduler" does not have a connection factory name. The connection factory name for jobs must be "JobQueueFactory".
Steps that I have followed are bit different from what is mentioned in document "SAP NW Scheduler for Java" as I am working in 7.3
a) Created EJB Project
b) Created Message Driven Bean(JobSchedulerMDB.jav)
c) Created SchedulerJob(TestScheduler.java)
I dont see application-j2ee-engine.xml ; but have
ejb-j2ee-engine.xml
ejb-jar.xml
job-defination.xml
with following xml in them
ejb-j2ee-engine.xml
<?xml version="1.0" encoding="UTF-8"?>
<ejb-j2ee-engine xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="ejb-j2ee-engine_3_0.xsd">
<enterprise-beans>
    <enterprise-bean>
      <ejb-name>JobSchedulerMDB</ejb-name>
      <jndi-name>JobSchedulerMDB</jndi-name>
      <bean-props>
        <property>
          <property-name>destination-name</property-name>
          <property-value>JobQueue</property-value>
        </property>
        <property>
          <property-name>connection-factory-name</property-name>
          <property-value>JobQueueFactory</property-value>
        </property>
       </bean-props>
    </enterprise-bean>
</enterprise-beans>
</ejb-j2ee-engine>
ejb-jar.xml
<?xml version="1.0" encoding="UTF-8"?>
<ejb-jar xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:ejb="http://java.sun.com/xml/ns/javaee/ejb-jar_3_0.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/ejb-jar_3_0.xsd" version="3.0">
<display-name>
JobSchedulerEJBProject </display-name>
<ejb-client-jar>JobSchedulerEJBProjectClient.jar</ejb-client-jar>
</ejb-jar>
job-defination.xml
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<job-definitions>
<job-definition name="TestScheduler"/>
<enterprise-beans>
<enterprise-bean>
<ejb-name>JobSchedulerMDB</ejb-name>
<jndi-name>JobSchedulerMDB</jndi-name>
<resource-ref>
<res-ref-name>JobQueueFactory</res-ref-name>
</resource-ref>
<message-destination-ref>
<message-destination-ref-name>JobQueue</message-destination-ref-name>
<jndi-name>JobQueue</jndi-name>
</message-destination-ref>
</enterprise-bean>
</enterprise-beans>
</job-definitions>
Please help me in this

Errors in DB alert log for distributed transactions

Hi,
I am receiving the following type of errors regularly in one of our development databases:
Errors in file e:\oracle\product\diag\rdbms\agdev10g\agdev10g\trace\agdev10g_reco_16356.trc:
ORA-12514: TNS:listener does not currently know of service requested in connect descriptor
ORA-02062: distributed recovery received DBID d672931d, expected 2d7b9dec
ORA-12154: TNS:could not resolve the connect identifier specified
ORA-12500: TNS:listener failed to start a dedicated server process
ORA-12154: TNS:could not resolve the connect identifier specified
From researching on the net it looks like it may have something to do with distributed transactions and database links however I'm not sure how to proceed to diagnose the problem and find out where the issue is. Can anyone help?
Thanks
Adam
Edited by: Adam J. Sawyer on 27/05/2010 16:57

SQL*Net typically involves two systems so post following details for both systems
Post Operating System (OS) name & version for DB server system.
Post results of
SELECT * from v$version
or post Oracle version to 4 decimal places
oerr ora 12514
12514, 00000, "TNS:listener does not currently know of service requested in connect descriptor"
// *Cause: The listener received a request to establish a connection to a
// database or other service. The connect descriptor received by the listener
// specified a service name for a service (usually a database service)
// that either has not yet dynamically registered with the listener or has
// not been statically configured for the listener. This may be a temporary
// condition such as after the listener has started, but before the database
// instance has registered with the listener.
// *Action:
// - Wait a moment and try to connect a second time.
// - Check which services are currently known by the listener by executing:
//    lsnrctl services <listener name>
// - Check that the SERVICE_NAME parameter in the connect descriptor of the
//    net service name used specifies a service known by the listener.
// - If an easy connect naming connect identifier was used, check that
//    the service name specified is a service known by the listener.
// - Check for an event in the listener.log file.
bcm@bcm-laptop:~$ oerr ora 2062
02062, 00000, "distributed recovery received DBID %s, expected %s"
// *Cause: a database link at a coordinator no longer points to the expected
//         database. Link may have been redefined, or a different DB mounted.
// *Action: restore link definition or remote database.
bcm@bcm-laptop:~$ oerr ora 12154
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
// be resolved into a connect descriptor using one of the naming methods
// configured. For example, if the type of connect identifier used was a
// net service name then the net service name could not be found in a
// naming method repository, or the repository could not be
// located or reached.
// *Action:
//   - If you are using local naming (TNSNAMES.ORA file):
//      - Make sure that "TNSNAMES" is listed as one of the values of the
//        NAMES.DIRECTORY_PATH parameter in the Oracle Net profile
//        (SQLNET.ORA)
//      - Verify that a TNSNAMES.ORA file exists and is in the proper
//        directory and is accessible.
//      - Check that the net service name used as the connect identifier
//        exists in the TNSNAMES.ORA file.
//      - Make sure there are no syntax errors anywhere in the TNSNAMES.ORA
//        file. Look for unmatched parentheses or stray characters. Errors
//        in a TNSNAMES.ORA file may make it unusable.
//   - If you are using directory naming:
//      - Verify that "LDAP" is listed as one of the values of the
//        NAMES.DIRETORY_PATH parameter in the Oracle Net profile
//        (SQLNET.ORA).
//      - Verify that the LDAP directory server is up and that it is
//        accessible.
//      - Verify that the net service name or database name used as the
//        connect identifier is configured in the directory.
//      - Verify that the default context being used is correct by
//        specifying a fully qualified net service name or a full LDAP DN
//        as the connect identifier
//   - If you are using easy connect naming:
//      - Verify that "EZCONNECT" is listed as one of the values of the
//        NAMES.DIRETORY_PATH parameter in the Oracle Net profile
//        (SQLNET.ORA).
//      - Make sure the host, port and service name specified
//        are correct.
//      - Try enclosing the connect identifier in quote marks.
//   See the Oracle Net Services Administrators Guide or the Oracle
//   operating system specific guide for more information on naming.
bcm@bcm-laptop:~$ oerr ora 12500
12500, 00000, "TNS:listener failed to start a dedicated server process"
// *Cause: The process of starting up a dedicated server process failed.
// The executable could not be found or the environment may be set up
// incorrectly.
// *Action: Turn on tracing at the ADMIN level and reexecute the operation.
// Verify that the ORACLE Server executable is present and has execute
// permissions enabled. Ensure that the ORACLE environment is specified
// correctly in LISTENER.ORA. The Oracle Protocol Adapter that is being
// called may not be installed on the local hard drive. Please check that
// the correct Protocol Adapter are successfully linked.
// If error persists, contact Oracle Customer Support.What explicit SQL or command trigger these errors?

Oracle Link for Distributed Transaction

In my application, I've to integrate two system (or I would say two separate instances of Oracle databases) through a Java Program.
Program will copy some data (approximately 100 records/hour) from one instance of Oracle database and transfer the same to other instance of Oracle and Vice versa. Since this is going to be a stand alone batch application, I thought of using Distributed Transaction Manager like JBOSS TM for controlling distributed transaction.
Is this approach right? Or can you suggest me any other better approach for this job?

853627 wrote:
I do agree with your Oracle Link explanation, and Yes that would be ideal to have in this case. For some reason, I'm forced to use the Java way.
Why i'm using the distributed transaction because, I'm following certain steps to complete one iteration:
1) Read the data from Database A,
2) Move the data to Database B
3) After successful execution of Step 1 and 2, There is another table in Database A where I need to mark that certain records have been migrated from Database 'A' to 'B'
4) After that I've to update a summary table with details of the migration like : Number of records read, Time when this routine completed, any validation error in records etc..Distributed transactions require database level support and complications.
But I don't see anything that suggests you need this.
First step is no transaction based.
Only failure point is between 2 and 3/4. And I suspect you could handle that with a tracking table in A.
1) Start transaction, Read the data from Database A, Update tracking table, end transaction.
2) Move the data to Database B
3) Start Transaction
4) After successful execution of Step 1 and 2, There is another table in Database A where I need to mark that certain records have been migrated from Database 'A' to 'B'
5) (Presumably A) After that I've to update a summary table with details of the migration like : Number of records read, Time when this routine completed, any validation error in records etc..
6) Clean tracking table
7) End transaction.
If there is a failure, then use the tracking table to facilate correction.

What logging implementation for distributed transaction on Oracle 8?

Hi,
I have a script running on Oracle 8 that accesses remote databases. I would like to create a transaction log that creates log entries in another table as the script progresses. I initially tried creating a logging procedure that used PRAGMA AUTONOMOUS_TRANSACTION but this failed because of this error message:
ORA-00164: autonomous transaction disallowed within distributed transaction
I can't set the transaction to read only as database updates are part of the script.
Is there another strategy that I could use to create the logs I need?
Cheers,
kj

Hi,
I have a script running on Oracle 8 that accesses remote databases. I would like to create a transaction log that creates log entries in another table as the script progresses. I initially tried creating a logging procedure that used PRAGMA AUTONOMOUS_TRANSACTION but this failed because of this error message:
ORA-00164: autonomous transaction disallowed within distributed transaction
I can't set the transaction to read only as database updates are part of the script.
Is there another strategy that I could use to create the logs I need?
Cheers,
kj

SAAJ 1.2 factory class for Weblogic 9 ?

Whats the name of the SAAJ factory class to use in WLS 9.0
to use SAAJ 1.2 functionality ?
I tried
System.setProperty("javax.xml.soap.SOAPFactory",
"com.bea.saaj.SOAPFactoryImpl");
but I keep getting a class not found exception. When I use the
default factory I get a method not supported.
Any ideas ?
/s

How about
System.setProperty("javax.xml.soap.MessageFactory", "weblogic.xml.saaj.MessageFactoryImpl");
System.setProperty("javax.xml.soap.SOAPFactory", "weblogic.xml.saaj.SOAPFactoryImpl");
Jong

Java database connection method class for review

Can you guys tell me any specific coding standard has to be followed here(i guess i need not hard code the pwd's)
import java.sql.*;
public class DBLocator {
     * Obtains and returns a connection to database
     * @return database connection
     public static Connection getConnection() {
     Connection con = null;
     try {
          Class.forName("com.informix.jdbc.IfxDriver");
          String url = "jdbc:informix-sqli://151.140.160.201:1527/ssde_db:INFORMIXSERVER=ssde_infx";
     con = DriverManager.getConnection(url,"haha06","123123");
} catch (ClassNotFoundException e) {
               System.out.println("Driver not found");
          } catch (SQLException e) {
               System.out.println("SQL exception");
               e.printStackTrace();
          return con; // returns connection
}

Can you guys tell me any specific coding standard has
to be followed here(i guess i need not hard code the
pwd's)More than just the passwords. Why are the driver class and URL hard-coded?
I wouldn't use this class. It's not very useful as written. It's a poor abstraction for one. There's lots of other useful things that you could include, like methods for closing and rolling back a connection, closing a statement and result set. You don't log any exceptions or messages. You preclude the use of a connection pool managed by an Java EE app server.
%

User_Exit (Condition Class) for ME21N Transaction

Hello Gurus !!.
I need one User_Exit for the ME21N Transaction what
is activate into the moment of Conditions Class input
(tax), the idea is to take one value of one Z table, make
one calculate betwen Z table Value and Condition Class tax
whose result will be return to the Value of Condition.
Thank Very Much for yours help.

Hi,
You can try any one of the user exit;
MM06E005 - Customer fields in purchasing document
MEQUERY1 - Enhancement to Document Overview ME21N/ME51N
Bye,
Muralidhara

Proper object oriented design for factory class

I have a factory class (UserFactory) it is capable of creating two types of classes (Customer and Employee) that extend User. User is an abstract class.
At present any class could create a Customer of an Employee.
How do I restrict access to the constructors of Customer and Employee only to UserFactory?
I don't want to make both of these classes interfaces (in which case I could just have UserFactory implement both of them).
Here is an example of how they are set up at present:
public abstract class User {
public class Customer extends User{
public Customer{
public class Employee extends User {
public Employee {
public class UserFactory ???? {
private static UserFactory c_userFactory = null;
private UserFactory (){
public UserFactory getInstance(){
//private clone method too
public Customer createCustomer(){
public Employee createEmployee(){
Oh and I don't want to create two separate factory classes for Employee and Customer. In C++ there is a concept of friend classes that would have worked nicely in this case.
Thanks for any and all suggestions,
Tim

So correct me if I'm wrong but your suggestion would be something along the lines of:
public abstract class User {
public class Customer extends User{
protected Customer(){
public class Employee extends User {
protected Employee (){
public class UserFactory ???? {
private static UserFactory c_userFactory = null;
private UserFactory (){
public UserFactory getInstance(){
//private clone method too
public Customer createCustomer(){
public Employee createEmployee(){
public class AccessForCustomer extends Customer {
public class AccessForEmployee extends Employee {
Is the above about what you were talking about? I haven't used inner classes before, so I'm a bit curious. Does this mean no class other than UserFactory or derivatives thereof can access the two classes AccessForCustomer and AccessForEmployee?
Thanks,
Tim

Failed to lookup connection factory weblogic.jms.XAConnectionFactory

when i deploy any service with jms protocol (write to queue) using sbconsole i face this error
"Failed to lookup connection factory weblogic.jms.XAConnectionFactory"
any suggestion?
Thanks

weblogic.jms.XAConnectionFactory is the default XA connection factory class. You wont see this in any JMS modules in Weblogic server. It should be available by default.
Can you once check the JNDI tree of your servers if this JNDI name exists. (in Weblogic Administration console go to Servers, click on any server and there will be a link for JNDI tree on the server's page)
Also, try creating a new connection factory in Weblogic console and using that in your service. Although it is highly unlikely that a new connection factory will work since all custom XA connection factories are dependent on the default connection factory class you mentioned.

ADF- Jdev11.1.1.6 Business Components supports distributed transaction ?

Hi ,
I'm using Jdeveloper 11.1.1.6 release 1 . How to implement distributed transaction in ADF business component level.
In my scenario i need to perform A Single transaction with two different database . I do need to role back both if either one fails (Distributed Transactions) . How could i achieve this in ADF business component. Does ADF has any built-in support for Distributed transactions.
Could anybody advice me .
Thanks in Advanced .

Thanks for your response !!! What is the best alternative i can choose to achieve Distributed Transaction in ADF Application , if there is no inbuilt support for it in BC?
Edited by: 994058 on Mar 15, 2013 7:16 AM
Edited by: 994058 on Mar 15, 2013 7:18 AM

ECC-6.0 supports XA(Distributed Transactions)&WS-AT(Web Services u0096 Atomic)

Hi
1- Does SAP ECC-6.0 support XA transactions?
XA Transactions stand for (Distributed Transactions).
2- Does SAP ECC-6.0 Web services allow participation in WS-AT?
WS-AT Stands for is Web Services Atomic Transaction specification.
If so please provide the referral point where I can get the Documentation regarding this.
Any earlier reply will be rewarded.

Hi
1. What is meant by XA ?? Please clarify.. I guess, ECC should support..
2. Yes...
SAP supports ATS... Atomic Transaction specification defines protocols that is recognized by SAP. This failure atomicity property is supported by atomic transactions, which have the following familiar ACID properties.
See useful pointers ->
http://specs.xmlsoap.org/ws/2004/10/wsat/wsat1104.pdf
http://soa.sys-con.com/read/39769.htm
http://searchsoa.techtarget.com/sDefinition/0,,sid26_gci1282196,00.html
http://docs.oasis-open.org/ws-tx/wstx-wsat-1.1-spec-pr-01/wstx-wsat-1.1-spec-pr-01.html
Regards
- Atul

"Datasource" or "Tx Datasource" for Local Transactions

I am wondering whether I should use a "Normal DataSource" or "Transactional DataSource"
Object in my EJB deployment.
According to the docs, Tx Datasources are needed only for distributed transactions.
For local transactions Datasource is recommended. I need only local transactions
and
initially used a non-transactional datasource.
The problem I came across is that WL6.1 doesn't set the ISOLATION LEVEL as specified
in the deployment descriptors when a normal Datasource object is used.
When I switch to Tx Datasource - isolation is set properly.
Has anyone encountered this and is it a bug or am I not understanding the
documentation correctly.
Thanks, Samuel Kounev

and combine LO DS with AP/AR and GL through infoset or mutiprovider...
You need to look for these KPIs in different datasources...and then link them.
Regards,
Ashish

Distributed Transaction Processing Services in Oracle RAC 11.2

Hi,
Do we have to set the DTP parameter to TRUE for workload services that are going to be used for distributed transaction processing?
Something like this ...
srvctl modify service -d crm -s xa_01.service.us.oracle.com -x TRUE
Oracle 11.2 document is not very clear on this requirement. At one stage it says...
"Tightly coupled XA transactions no longer require the special type of singleton services (that is, Oracle Distributed Transaction Processing (DTP) services) to be deployed on Oracle RAC database. XA transactions are transparently supported on Oracle RAC databases with any type of services configuration."
But at the end of the same section...
"An external transaction manager, such as OraMTS, coordinates DTP/XA transactions. However, an internal Oracle transaction manager coordinates distributed SQL transactions. Both DTP/XA and distributed SQL transactions must use the DTP service in Oracle RAC."
So do we have to use DTP services with RAC or not?
Thanks,
-Sanjeev
Edited by: user12219014 on 28 Jan, 2011 8:04 PM

Hi Sanjeev,
I have some critical applications using Tuxedo on 10gR1/R2 RAC databases and there is no doubt to have with this versions.
Starting with 11gR1 it seems the main limitation is over...but there are still limitations ! To be honest I will keep the DTP parameter to true after the migration in 11.2 to avoid any problem. It is still recommended even if not mandatory :
To provide improved application performance with distributed transaction processing in Oracle RAC, you may want to take advantage of DTP services. Using DTP services, you can direct all branches of a distributed transaction to a single instance in the cluster. To load balance across the cluster, it is better to have several groups of smaller application servers with each group directing its transactions to a single service, or set of services, than to have one or two larger application servers.
Also check note 462060.1.
Best regards
Phil
Edited by: Philippe Florent on Jan 30, 2011 10:07 AM -- add documentation precision

Connection Factory class for Distributed Transaction?

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