Instruments and Systems: Monitoring, Control, and Diagnostics Annotation << Back Solution of the construction problem of optimal logical structures of network databases in fuzzy environment O.V. LANKIN, E.V. KOSTERIN The logical structure of the database is the basis for optimizing the network database. Optimally designed logical structure of the network database provides the foundation for optimal performance of database and application. In the article the algorithm for solving the synthesis problem of the optimal logical structure of network database in fuzzy environment on the criterion of minimum total time of loading network database, service multiple requests of users and making adjustments in the network database are considered. Time parameters are presented in the form of fuzzy variables, allowing to objectively determine the source data synthesis problem. The synthesis problem is a nonlinear mathematical programming problem with Boolean variables of large dimension. To solve it, is used a method based on the scheme “branch and bound”. The article considers an algorithm for solving the case of one point entry into the structure. Also considered a branch scheme, which will provide the necessary multivariate distribution of a multiplicity of groups of the network database canonical structure on records and allowed to reduce the number of variants (points) under consideration compared to the total branch scheme. Keywords: network databases, canonical structures, logical structures, fuzzy variables, database management system. Contacts: - Pp. 06-10.