The textbook describes the construction and use of database technology in the decision-making process. The textbook is distinguished by a systematic consideration of theoretical issues that are accompanied by computer implementation. This allows you to better understand the procedures for building, working and using databases. Well-established theoretical issues and new aspects related to both local and distributed databases, object-oriented databases, data warehouses are considered. The client-server mode is discussed in detail, including in the remote version and in cloud computing.