Expiring Data in a Warehouse

Data warehouses are used to collect and analyze data from remote sources. The data collected oftenoriginate from transactional information and can become very large. This paper presents a framework forincrementally removing warehouse data (without a need to fully recompute views), offering two choices.One is to expunge data, in which case the result is as if the data had never existed. The second is toexpire data, in which case views defined over the data are not necessarily affected....