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In the article such ways of optimization of the structure of a database of complex structured objects that allow simplifying the scheme of an information system. As a result, the response time of the information system to the user's request is reduced, and it becomes possible to more effectively manage and monitor the progress of ongoing processes. A formalized model of the relational expression is developed, a model of the corresponding equivalent transformation of the chosen relationaldoi:10.14419/ijet.v7i2.13.11626 fatcat:cnglxawll5evtnqgbjdr3zdh7a