Abstract
The work of transforming a database from one format periodically appears in different organizations for various reasons. Today, the mechanism for changing the format of relational databases is well developed. But with the advent of new types of database such as NoSQL, this problem was exacerbated due to the radical difference in the way data was organized. This article discusses a formalized method based on set theory, at the choice of the number and composition of collections for a key-value type database. The initial data are the properties of the objects, information about which is stored in the database, and the set of queries that are most frequently executed or the speed of which should be maximized. The considered method can be applied not only when creating a new key-value database, but also when transforming an existing one, when moving from relational databases to NoSQL, when consolidating databases.
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