651 search results - page 23 / 131 » Algebraic Query Optimization for Distributed Top-k Queries |
CIKM
2007
Springer
14 years 3 months ago
2007
Springer
Spatial queries for extracting data from wireless sensor networks are important for many applications, such as environmental monitoring and military surveillance. One such query i...
ADL
2000
Springer
14 years 1 months ago
2000
Springer
We address the problem of tight XML schemas and propose regular tree automata to model XML data. We show that the tree automata model is more powerful that the XML DTDs and is clo...
SYRCODIS
2008
13 years 10 months ago
2008
In the last few years, XML became a de-facto standard for the exchange of structured and semi-structured data. The database research community took this development into account b...
EDBT
2008
ACM
14 years 9 months ago
2008
ACM
Scientific data are available through an increasing number of heterogeneous, independently evolving, sources. Although the sources themselves are independently evolving, the data ...
DEXAW
1999
IEEE
14 years 1 months ago
1999
IEEE
This paper describes an algebra for use with parallel object databases, and in particular ODMG compliant databases with OQL. Although there have been many proposals for parallel r...