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In this paper, the authors presents the concurrency control method implemented for a multimedia database management system. The system provides simultaneous access to information for multiple clients via TCP/IP network. The problems that should be handled refers to process multiple requests and access the same set of data in a concurrent environment. It is also measured the system's performances in different usage scenarios. The system that is presented in the paper is an original C++ implementation, which integrates methods for extracting visual characteristics (color and texture characteristics) from images and for executing content-based visual queries.