Lock between transaction branches of a global transaction

Hi,
I have an Oracle Database v.10.1.0.4, on which there are two schemas (A and B).
A table on schema A has a reference key on a table on schema B.
Now, i have a j2ee application that uses two distinct connection to performs inserts on both schemas within the same global transaction (using a JTATransactionManager), but i'm experiencing a lock in the following situation:
1 - On connection for schema B, a new ROW is inserted
2 - On connection for schema A, a new ROW is inserted referencing the new row in schema B, but the query is locked by the insert on schema B.
It is like the two transacions are loosely coupled and not tightly coupled as I would expect for distributed transaction on the same oracle instance (or at least they are not part of a global transaction and are treated as two distinct transaction).
Someone know if oracle jdbc drivers handle tightly coupled transactions for transaction branches on the same oracle instance that are part of the same global transaction?
Thanks,
Luca De Petrillo

http://www.myoracleguide.com/s/managelocks.htm

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Advise on using DBMS_XA with multiple branches under one global transaction

Dear all
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m5
m6
a4
a5
b4
b5
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OK, I've figured it out. This is poorly documented as it's not well explained how to handle the various return codes. Turns out that all but the last xa_prepare calls return dbms_xa.xa_rdonly (tightly coupled branches are combined -- "read only" optimization), the last one returns dbms_xa.xa_ok and this is when you should call xa_commit.
Now my next problem is that DBMS_XA doesn't work from within jobs (DBMS_JOB and DBMS_SCHEDULER), which makes it very difficult to use DBMS_XA. My purpose of using DBMS_XA is to coordinate work across multiple sessions in one transaction but if I can't easily create the multiple sessions, I'm stuck.
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It simply means that there is only one entity bean instance per PK in the
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James DeFelice <[email protected]> wrote:
Thank you for the suggestion. I have considered taking this path, but before I
make a final decision, I was hoping to get a clear answer to the question that
I stated below:
What EXACTLY is guaranteed by the "Exclusive" concurrency-strategy? Maybe someone
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To be safe: You should clear those values before the ejb load or set
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Tangosol, Inc.
http://www.tangosol.com/coherence.jsp
Tangosol Coherence: Clustered Replicated Cache for Weblogic
"James DeFelice" <[email protected]> wrote in message
news:[email protected]...
Some of the properties in our entity bean implementation classes arenot
declared
in our descriptor files, and therefore, are non-persistent (we areusing
container-managed
persistence); I will refer to these properties as "non-persistentproperties".
In WebLogic 5.1, we've noticed that the non-persistent properties arecached in
between transactions. For instance, I ask for a particular Person(Person(James)),
and I set one of the non-persistent properties (Property(X)) insideTransaction(A).
In Transaction(B) (which is exclusive of Transaction(A)), I accessProperty(X)
and find that it is the same value as I had set in Transaction(A)-this
gives
the appearance that non-persistent entity properties are being cachedin
between
transactions.
The same appears to hold true in WebLogic 7 SP1, however, we must usethe
"Exclusive"
concurrency-strategy to maintain this consistency.
I am worried that this assumption we are making of non-persistentproperties is
not valid in all cases, and the documentation does not promise anythingin
the
way of such an assumption. I am worried that the container could killthe
Person(James)
entity implementation instance in the pool after Transaction(A), andcreate a
new Person(James) instance to serve Transaction(B)- once that happensour
assumption
fails.
"Database" concurrency strategy seems to fail our assumption on a regularbasis,
but that makes sense, since the documentation states that the "databasewill maintain
the cache", and the container seems more willing to kill instanceswhen
they are
finished with, or create new instances for new transactions.
So my question is this: What is exactly guaranteed by the "Exclusive"concurrency-strategy?
Will the assumption that we've made above ever fail under this strategy?
Thanks in advance for any help.
Regards,
James
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Lock between transaction branches of a global transaction

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