353 search results - page 33 / 71 » Processing Top-k Join Queries |
ICDE
2008
IEEE
14 years 9 months ago
2008
IEEE
In this paper we address the problem of minimizing the response time of a multi-way join query using pipelined (inter-operator) parallelism, in a parallel or a distributed environ...
IDEAS
2010
IEEE
13 years 6 months ago
2010
IEEE
Even though an effective cost-based query optimizer is of utmost importance for the efficient evaluation of XQuery expressions in native XML database systems, such a component is...
WWW
2007
ACM
14 years 8 months ago
2007
ACM
Most RDF query languages allow for graph structure search through a conjunction of triples which is typically processed using join operations. A key factor in optimizing joins is ...
WWW
2008
ACM
14 years 8 months ago
2008
ACM
This paper proposes several vectorial operators for processing XML twig queries, which are easy to be performed and inherently efficient for both Ancestor-Descendant (A-D) and Par...
ICALP
2005
Springer
14 years 1 months ago
2005
Springer
We study a clean machine model for external memory and stream processing. We show that the number of scans of the external data induces a strict hierarchy (as long as work space is...