285 search results - page 12 / 57 » Optimization of Real Conjunctive Queries |
CORR
2007
Springer
13 years 6 months ago
2007
Springer
We address the problem of answering Web ontology queries efficiently. An ontology is formalized as a Deductive Ontology Base (DOB), a deductive database that comprises the ontology...
SEMWEB
2010
Springer
13 years 4 months ago
2010
Springer
We study the problem of SPARQL query optimization on top of distributed hash tables. Existing works on SPARQL query processing in such environments have never been implemented in a...
VLDB
2001
ACM
14 years 7 months ago
2001
ACM
The problem of answering queries using views is to find efficient methods of answering a query using a set of previously materialized views over the database, rather than accessing...
BTW
2007
Springer
14 years 27 days ago
2007
Springer
: Distributed top-k query processing is increasingly becoming an essential functionality in a large number of emerging application classes. This paper addresses the efficient alge...
PVLDB
2010
13 years 5 months ago
2010
Range queries based on L1 distance are a common type of queries in multimedia databases containing feature vectors. We propose a novel approach that transforms the feature space i...