One of the most important issues in contemporary database application became processing of the large amount of data. Second problem is different characteristic of the data that are processed by the system. Those data are perceived as large continuous streams of elements rather than finite sets of elements. This thesis presents new class of database systems that handles data stream processing, issues and benefits form using these systems in the context of telecommunication systems. It also presents the huge advantage of the stream databases application in the information systems which may be the reduction of the complexity. Complexity reduction, which has been shown by many researchers, leads to the reduction of costs and maintenance time.