Shrinking the Warehouse Update Window

Wilburt Labio, Ramana Yerneni, Hector Garcia-Molina


Warehouse views need to be updated when source data changes. Due to the constantly increasing size of warehouses and the rapid rates of change, there is increasing pressure to reduce the time taken for updating the warehouse views. In this paper we focus on reducing this update window by minimizing the work required to compute and install a batch of updates. Various strategies have been proposed in the literature for updating a single warehouse view. These algorithms typically cannot be extended to come up with good strategies for updating an entire set of views. We develop an efficient algorithm that selects an optimal update strategy for any single warehouse view. Based on this algorithm, we develop an algorithm for selecting strategies to update a set of views. The performance of these algorithms is studied with experiments involving warehouse views based on TPC-D queries.