Abstract: Methods, systems, and computer program products for providing statistical data relating to a plurality of input files from a data warehouse. A plurality of bins are associated with a plurality of hierarchically ordered index fields. Each index field is associated with a parameter of the input files and is configured to accept an index field value from a predefined value domain associated with the index field. A lookup table is defined that includes a plurality of hierarchically indexed data structures and data containers storing statistical data for each index within the data structures. For each data structure, a primary key and at least one secondary key are formed by concatenating one or more bins in compliance with a hierarchy of the hierarchically ordered index fields to form a sequence of bins, The lookup table includes only one primary key per data structure.

Abstract: The invention relates to a method for providing statistical data from a data warehouse (410) involving one or more data storage means and one or more processor coupled to the data storage means characterized in that it comprises the steps of: defining a plurality of index fields (114) each index field accepting a plurality of index field values; creating a plurality of indexed files (432) and hierarchically indexing the files as trees of indexes (300) which includes, for each tree, the steps of: hierarchically ordering the index fields (201); defining bins, each bin being associated to an index field and gathering one or more index field values for that index field; creating indexes by concatenating one or more bins in compliance with the hierarchy of hierarchically ordered index fields to form a sequence of bins, an index comprising only one bin per index field; hierarchically indexing the files as trees of indexes (300), each index having zero or more children indexes or and having at most one parent index,