XA transactions enabled by default

I would like to check if XA transactions are enabled by default on installation of Oracle10gR2 Enterprise, and 11g? I believe it is, however I wanted to know what controls this during the install.
I would also like to know how to verify if this is installed by interrogating the database with some query?
I've seen a similar post with no replies: How to check if XA transactions are enabled?
I also see many references from IBM's WebSphere documentation stating a need to initialise the JServer and XA transactions using initjvm.sql and initxa.sql. However I've also read resources that suggest the XA transaction support is installed by default:
'The initXA.sql script needs to be run before XA transactions will work. These are usually installed by default in 10gR2.'
http://download.oracle.com/docs/cd/E12461_01/130/installation_guide/Chapter%203%20-%20Database%20Installation%20Tasks.htm
Thanks,
Louis Burton

Hi Salman,
Thanks very much for your response. I had actually checked the orafaq you linked to but was worried it may not be up to date for the current oracle versions, as after stating:
'Oracle is XA compliant by default'
I see that there are specific script steps listed to run (xaview.sql) for a much older version of Oracle 7.3.
I have also just looked at My Oracle Support note 1201244.1 'Health check list when configuring XA Transaction in Oracle SOA 11g'
For the database this states :
•Verify if XA is enabled in the participating database server. The steps to prepare the database for XA are:
1.Log on to sqlplus as system user, for example, sqlplus sys/CHANGE_ON_INSTALL
2.Execute the following command: @xaview.sql The xaview.sql script resides in the $ORACLE_HOME/rdbms/admin directory
Now it doesn't actually give instructions for how to verify if this is enabled, it just instructs to verify, and then gives steps on how to enable it.
Elsewhere in the article it describes checking necessary parameters using:
'show parameter distributed_lock_timeout;'
Is having a value here sufficient to verify that it has been configured?
I am also more confused now also, as this note and the orafaq both quote running the xaview.sql, whereas elsewhere I have read to use the initxa.sql script for enabling XA.
http://www.ibm.com/developerworks/websphere/library/techarticles/0407_woolf/0407_woolf.html#N10739
On looking at the xaview.sql I see that it creates two views.
However after logging into my database as sys I recieve:
SQL> desc v$xatrans$
ERROR:
ORA-04043: object v$xatrans$ does not exist
SQL> desc v$pending_xatrans$
ERROR:
ORA-04043: object v$pending_xatrans$ does not exist
Does this mean I don't have it enabled by default as the links you gave state? These scripts have not been run manually that I know of. I can't follow the note step to verify if its enabled as it doesn't explain how to.
I do know we use container managed transactions from app servers, such as WebLogic, with XA datasources against the database without issue.
I apologise if I have misunderstood something, any clarification is appreciated.
Louis Burton

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