Ragnar Normann

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Snapshot Isolation is a popular and efficient protocol for concurrency control. In this paper we discuss Snapshot Isolation in view of the classical theory for transaction processing. In addition to summarizing previous research we prove that the set SI of histories that may be generated by Snapshot Isolation is incomparable to final state, view and(More)
UML has become a de facto standard methodology for modelling and designing information systems. Many (and among them, the authors) think that UML’s Class Diagram is a step backwards from some older techniques and methods used to design (static) data models. In this paper we look briefly into the expressive power of the UML Class Diagram in comparison to ORM(More)
The article “Replication and consistency in a distributed environment” by Breitbart and Korth [Yuri Breitbart, Henry F. Korth, J. Comput. System Sci. 59 (1) (1999) 29–69] presents replication graphs as an efficient means to handle concurrency control in replicated databases. This technical note identifies and explains two inaccuracies in this article: • The(More)
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