Query optimization based on users profile

This paper presents a new innovate method for the query order execution plan for our hybrid data integration system by selection of the relevant sources to retrieve the data. Indeed, the system must adapt to user needs and enable it to obtain relevant information and effective according to its profile. In this context, we present cooperative model, which adapt to changing user profiles and change the embedded sources, and sharing of knowledge among users will facilitate the analysis of information and to improve the process of searching for data quality in space and time.