The model of on-line transaction processing system architecture constructed by a principle of cloud structure is considered. The mathematical model of OLTP-system as the queuing system is offered. Results of modeling and their analysis are led.

Keywords: On-line transaction processing system, Cloud architecture, Distributed database, Queuing system

The rapidly growing information space combined area networks creates new needs for management, reporting, and especially in the search for data. On the first place there is the criterion of relevance, which allows for its correct use to increase the efficiency of information retrieval. There is a fairly large number of schemes and models for solving search problems, one of which is the BM25.

Keywords: genetic algorithm, information retrieval, modification BM25

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