US Patent 7822712 Incremental data warehouse updating

Processes, systems and computer programs for data management. New fact data is received, e.g., at a data warehouse, and the new fact data is aggregated to incrementally update a first version of a materialized view (a pre-computed aggregation of data), the updated materialized view being a second version of the materialized view. While aggregating the new data, the first version of the materialized view is provided for serving by a query subsystem. After aggregating the new data to the materialized view, the second version of the materialized view is provided for serving by the query subsystem thereafter. At least one version of the materialized view is available for serving by the query subsystem even during aggregation.