Title :
On the correctness of query results in XML P2P databases
Author_Institution :
Dipt. di Informatica, Pisa Univ., Italy
Abstract :
In XML peer-to-peer (p2p) database systems, query results are usually assumed to be incomplete. Incompleteness issues derive from the unstable and open-ended nature of the network, where new nodes may connect at any time, and existing nodes may suddenly disappear. The incompleteness of input data used for query evaluation may also lead to the incorrectness of query results, which greatly affects the usefulness of the whole p2p approach to XML databases. We formally deal with the problem of result correctness in the presence of incomplete input data, and identify query classes for which the result correctness can be statically predicted at no extra cost w.r.t. usual syntactical and semantic query analysis.
Keywords :
XML; distributed databases; peer-to-peer computing; query processing; XML P2P databases; incomplete input data; open-ended network; peer-to-peer database systems; query classes; query evaluation; query result correctness; semantic query analysis; syntactical query analysis; Algebra; Computational modeling; Computer networks; Costs; Database systems; Distributed databases; Intelligent networks; Peer to peer computing; Query processing; XML;
Conference_Titel :
Peer-to-Peer Computing, 2004. Proceedings. Proceedings. Fourth International Conference on
Print_ISBN :
0-7695-2156-8
DOI :
10.1109/PTP.2004.1334927