19 search results - page 2 / 4 » Overcoming Limitations of Sampling for Aggregation Queries |
TMA
2010
Springer
13 years 2 months ago
2010
Springer
One-way packet delay is an important network performance metric. Recently, a new data structure called Lossy Difference Aggregator (LDA) has been proposed to estimate this metric m...
ICDE
2007
IEEE
13 years 10 months ago
2007
IEEE
We consider the problem of semantic load shedding for continuous queries containing window joins on multiple data streams and propose a robust approach that is effective with the ...
ICCSA
2009
Springer
13 years 11 months ago
2009
Springer
Data aggregation in Geographic Information Systems (GIS) is a desirable feature, spatial data are integrated in OLAP engines for this purpose. However, the development and operatio...
PERCOM
2008
ACM
14 years 3 months ago
2008
ACM
This paper identifies requirements for querying and accessing context information in mobile and pervasive computing environments. Furthermore it studies existing query languages s...
EDBT
2009
ACM
13 years 9 months ago
2009
ACM
Decision Support Systems (DSS) are information systems that support decision making processes. In many scenarios these systems are built on top of data managed by DBMSs and make e...