Method and system for deferred synchronisation of data

A method and a system of deferred synchronisation of data resulting from operations by applications ( 506 ) on a resource manager ( 501 ). The method includes receiving a request for an operation ( 511 ), identifying the operation as part of a synchronised transaction that has not yet started, completing the operation, subsequently starting the synchronised transaction ( 517 ) of which the completed operation is to be a part, and associating ( 519 ) the completed operation with the synchronised transaction ( 517 ). For example, the system may be an asynchronous messaging system with a plurality of distributed applications ( 506 ) getting and putting messages and the resource manager ( 501 ) is a queue manager. The operation ( 511 ) may be a get operation and the synchronised transaction ( 517 ) may be a unit of work.