Excerpt from Implementing Message Oriented Transaction Processing for Distributed Database Management Systems: May 1989

Each transaction that updates objects in a database transforms the database to a new state. The system state includes assertions about values of records and about the allowed transformations of the values. Transactions obey the assertions (laws of consistency constraints) by transforming consistent states into new consistent states.

Gray [gray81] points out a few desirable features of transaction processing systems that are not currently supported by such systems. He recommends the use of techniques such as time-domain addressing and also keeping a log of transaction processing activities (also see Recently, Gray [gray86] has suggested the idea of queued transaction processing (message oriented transaction processing) for decoupling the processing of the transaction from its submission and from the delivery of the response.

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