Demarcation: Starting and finishing transactions by means of begin, commit and rollback methods.
Controlling the Transaction Context: Transaction contexts contain all the information that helps a transaction manager to monitor a transaction. Transaction managers are in charge of building transaction contexts and connecting them to the existing thread.
Coordinating the Transaction: Transaction managers generally have the ability to harmonize a transaction over various resources. This feature demands the two-phase commit protocol. XA protocol is also used to register and manage the resources.
Recovery From Failure: Transaction managers are accountable to guarantee that the resources are not kept in an inconsistent state in case of a system or application failure.
