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CIKM
2010
Springer
13 years 7 months ago
Query optimization for ontology-based information integration
In recent years, there has been an explosion of publicly available RDF and OWL data sources. In order to effectively and quickly answer queries in such an environment, we present...
Yingjie Li, Jeff Heflin
CCGRID
2006
IEEE
14 years 3 months ago
Optimal Replica Placement Strategy for Hierarchical Data Grid Systems
Grid computing is an important mechanism for utilizing distributed computing resources. These resources are distributed in different geographical locations, but are organized to p...
Pangfeng Liu, Jan-Jan Wu
SSDBM
2008
IEEE
113views Database» more  SSDBM 2008»
14 years 3 months ago
Query Selectivity Estimation for Uncertain Data
Applications requiring the handling of uncertain data have led to the development of database management systems extending the scope of relational databases to include uncertain (p...
Sarvjeet Singh, Chris Mayfield, Rahul Shah, Sunil ...
SIGMOD
2001
ACM
229views Database» more  SIGMOD 2001»
14 years 9 months ago
A Robust, Optimization-Based Approach for Approximate Answering of Aggregate Queries
The ability to approximately answer aggregation queries accurately and efficiently is of great benefit for decision support and data mining tools. In contrast to previous sampling...
Surajit Chaudhuri, Gautam Das, Vivek R. Narasayya
VLDB
2004
ACM
113views Database» more  VLDB 2004»
14 years 2 months ago
Resource Sharing in Continuous Sliding-Window Aggregates
We consider the problem of resource sharing when processing large numbers of continuous queries. We specifically address sliding-window aggregates over data streams, an important...
Arvind Arasu, Jennifer Widom