1. A method for supporting transaction processing in a transactional environment, comprising: propagating, via a coordinator for a global transaction, a common transaction identifier and information for a resource manager instance to one or more participants of the global transaction in the transactional environment; allowing said one or more participants, which share resource manager instance with the coordinator, to use the common transaction identifier; processing the global transaction, via the coordinator, for said one or more participants that share the resource manager instance using one transaction branch.