817 search results - page 19 / 164 » Generating Efficient Plans for Queries Using Views |
CAISE
2003
Springer
14 years 26 days ago
2003
Springer
This paper describes view generation and view optimisation in the AutoMed heterogeneous data integration framework. In AutoMed, schema integration is based on the use of reversibl...
SIGMOD
2007
ACM
14 years 7 months ago
2007
ACM
Complex queries often contain common or similar subexpressions, either within a single query or among multiple queries submitted as a batch. If so, query execution time can be imp...
ADHOCNOW
2008
Springer
13 years 8 months ago
2008
Springer
This paper presents a novel method for optimizing sliding window based continuous queries. We deal with two categories of aggregation operations: stepwise aggregation (e.g. COUNT) ...
WWW
2004
ACM
14 years 8 months ago
2004
ACM
We present enhancements for UDDI / DAML-S registries allowing cooperative discovery and selection of Web services with a focus on personalization. To find the most useful service ...
DBA
2006
13 years 9 months ago
2006
In order to facilitate query processing, the information contained in data warehouses is typically stored as a set of materialized views. Deciding which views to materialize prese...