A Multiversion Trajectory Data Warehouse to Handle Structure Changes
The Data Warehouse (DW) technology was developed to integrate heterogeneous information sources for analysis purposes. Information sources are more and more autonomous and they often change their content due to perpetual transactions (data changes) and may change their structure due to continual users' requirements evolving (schema changes). Handling properly all type of changes is a must. In fact, the DW which is considered as the core component of the modern decision support systems has to be update according to different type of evolution of information sources to reflect the real world subject to analysis.. The goal of this paper is to propose a solution, based on versioning approach, able to handle structure changes in order to keep track of the DW evolution.