435 search results - page 31 / 87 » Querying Inconsistent Databases: Algorithms and Implementati... |
SIGMOD
2010
ACM
14 years 1 months ago
2010
ACM
In this paper, we propose an online aggregation system called COSMOS (Continuous Sampling for Multiple queries in an Online aggregation System), to process multiple aggregate quer...
VLDB
2005
ACM
14 years 2 months ago
2005
ACM
This paper presents a set of algorithms for efficiently evaluating join queries over static data tables in sensor networks. We describe and evaluate three algorithms that take adv...
SIGMOD
2007
ACM
14 years 9 months ago
2007
ACM
Good cardinality estimates are critical for generating good execution plans during query optimization. Complex predicates, correlations between columns, and user-defined functions...
VLDB
2005
ACM
14 years 2 months ago
2005
ACM
Query optimizers in current database systems are designed to pick a single efficient plan for a given query based on current statistical properties of the data. However, different...
VLDB
2004
ACM
14 years 9 months ago
2004
ACM
Abstract. In dynamic environments like the Web, data sources may change not only their data but also their schemas, their semantics, and their query capabilities.When a mapping is ...