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Conventional database management systems (DBMS) do not adequately meet the requirements of non-traditional, advanced applications, for example in data warehouse and on-line analytical processing (OLAP) systems. In order to support these applications, the functionality of conventional DBMS is being extended in several ways, between others by introducing some extensions to conventional query processing...
In this paper a techique allowing the use od Dynamic Programming in the large-dimensional cases of systems is presented. Classic Dynamic Programming usually collapses with large scale systems due to the enormous computational cost of system simulation. Active Dynamic Programming makes use of additional structural information we have in many cases. The optimized system often consists of autonomous...
An example of structural modelling with Petri nets with refinements is discussed. A simple assembly line consisting of two machines is considered. The assembly line model is made more precise by refining each transition representing the machine, by the Petri net defining its operation. The Petri net model of the assembly line is used as a building block while modelling an entire factory unit. The...
The ticket-based concurrency control allows the management of indirect conflicts between multidatabase transactions without violating site autonomy and ensuring global serializability. In this paper, by using discrete event simulation models, we compare two global concurrency control algorithms: the Optimistic Ticket Method (OTM) and the Multidatabase Timestamp Mechanism (MTSM). Performance of those...
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