Expanding the capabilities of modeling different classes of systems 5 is inextricably linked with the improvement of computer facilities and communication technology. A promising direction is the use for the purposes of modeling of hierarchical multi-computer information systems and telecommunications networks connected to them by remote personal computers operating in teleprocessing mode.

When creating large systems B their components are developed by different teams that use modeling tools to analyze and synthesize individual subsystems. In this case, developers need access to both collective and individual modeling tools, as well as the rapid exchange of simulation results of individual interacting subsystems. Thus, there is a need to create interactive systems for modeling of collective use, which are characterized by the following features: the possibility of simultaneous work of many users engaged in the development of one system B; user access to the software and technical resources of the modeling system, including distributed databanks and packages of modeling applications; providing a dialogue mode of operation with various computers and devices, including digital and analog computers, physical modeling units, elements of real systems, etc .; dispatching of works in automated modeling systems (ACM) and provision of various services to users, including training with the interactive modeling system; use of network technologies.

Consider the main points related to the development of a distributed modeling database (RDBM).

Key aspects of database development. Database technology (DB) is one of the main computer technologies and represents a set of methods and tools for determining and manipulating data integrated into the database [2, 14, 16]. An important goal of using database technology is to create a shared information resource that is shared between functionally connected applications, ensuring independence of the external, logical representation of the database from the ways of its internal, physical organization in the computer's memory. To achieve this goal, the database technology uses an appropriate set of technological tools.

The modern representation of database technology is determined by the use of the relational data model based on a rigorous apparatus of relational algebra and mathematical logic. Technological operations of definition and manipulation of a DB are carried out with use of systems of a relational calculus. The relational approach is generally considered as an ideology for creating databases and knowledge bases [2, 14, 52]. This approach is most effective in solving many problems of modeling complex systems & pound;.

On the one hand, widespread use of RMD allowed solving one of the most serious problems of achieving model homogeneity of databases created in the environments of various database management systems (DBMS), since almost all modern DBMS use models to relational. On the other hand, reliance on the relational model significantly limits the ability to define data in the database and, thereby, predetermines the appropriate boundaries for the application of all database technology.

Such an approach is certainly justified when designing a database in those cases when the database administrator has a schema for matching a set of data in a relational model with a lot of data about the real world. At the same time, the integration tendencies typical for the current stage of the development of computerized technologies (including in the modeling of systems) put the problem of constructing the integrated distributed databases (IRDD) for which the provision of circuit uniformity on the basis of the RMD for a number of reasons is not enough. This does not mean the requirement for revolutionary changes in the principles of the relational approach when designing a database in the conditions of building IRDD. This means only that when defining and constructing an IRDB, the relational approach should be applied taking into account the classical database design scheme [2, 52], according to which it is necessary to know how the complete cycle of simulation stages of a given domain in the form of relational schemes, integrable DB. Obviously, expanding the boundaries of the application of the relational approach, at the same time, will allow to design new databases already taking into account the possibility of their future integration and IRDD. A typical example of the implementation of the extension of the relational approach for the development of distributed applications based on integrated relational databases was the creation of methods and tools of ^ -technologies [15].

With this in mind, all the basic concepts and definitions of database technology will be formulated precisely with an orientation toward implementing an extended relational approach to achieve the goal of methodological definition of IADD. A complete flowchart for determining and manipulating the data integrated into the database is shown in Fig. 5.6.

thematic pictures

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