joint work with Francois Goasdoue and Ioana Manolescu
The view selection problem consists of choosing, given a set of queries, a set of views to materialize, in order to minimize the total cost of evaluating these queries and of maintaining the views. Several variants of the problem exist, encompassing the existence of a possible space constraint concerning the total size of the materialized views, or giving weights to each query, etc. This particular problem has been thoroughly examined for relational databases.
The increasing popularity of the RDF data model in Semantic Web and Web 2.0 applications, has turned the efficient evaluation of queries over large volumes of RDF data of paramount importance.
In this work, we address the view selection problem over large amounts of RDF data, given a set of conjunctive queries over this data. We characterize the search space associated to
this problem and define a set of transformation rules over the states. Various algorithms are presented for searching the search space.