System and method for supporting common transaction identifier (xid) optimization based on resource manager (rm) instance awareness in a transactional environment

A system for supporting transaction processing in a transactional environment, comprising:

• one or more microprocessors;
• a coordinator for a global transaction, running on the one or more microprocessors, wherein the coordinator operates to perform the steps comprising
• propagating 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 for said one or more participants that share the resource manager instance using one transaction branch.