Efficient Query Reformulation in Peer-Data Management Systems

Peer data management systems (PDMS) offer a flexible architecture for decentralized data sharing. In a PDMS, every peer is associated with a schema that represents the peer's domain of interest, and semantic relationships between peers are provided locally between pairs (or small sets) of peers. By traversing semantic paths of mappings, a query over one peer can obtain relevant data from any reachable peer in the network. Semantic paths are traversed by reformulating queries at a peer into queries on its neighbors. Naively following semantic paths is highly inefficient in practice. We describe several techniques for optimizing the reformulation process in a PDMS and validate their effectiveness using real-life data sets. In particular, we develop techniques for pruning paths in the reformulation process and for minimizing the reformulated queries as they are created. In addition, we consider the effect of the strategy we use to search through the space of reformulations. Finally,...

• Type: Conference
• Year: 2004
• Where: SIGMOD
• Authors: Igor Tatarinov, Alon Y. Halevy
• Keywords: Database, Pre-computing Semantic Paths, Reformulation Process, Semantic Paths, SIGMOD 2004