Generalizing GlOSS to Vector-Space Databases and Broker Hierarchies
Luis Gravano, Héctor García-Molina · 1995
As large numbers of text databases have become available on the Internet, it is harder to locate the right sources for given queries. In this paper we present gGlOSS, a generalized Glossary-Of-Servers Server, that keeps statistics on the available databases to estimate which databases are the potentially most useful for a given query. gGlOSS extends our previous work [1], which focused on databases using the boolean model of document retrieval, to cover databases using the more sophisticated vector-space retrieval model. We evaluate our new techniques using real-user queries and 53 databases. Finally, we further generalize our approach by showing how to build a hierarchy of gGlOSS brokers. The top level of the hierarchy is so small it could be widely replicated, even at end-user workstations. This research was sponsored by the Advanced Research Projects Agency (ARPA) of the Department of Defense under Grant No. MDA972-92-J-1029 with the Corporation for National Research Initiative...