429 search results - page 36 / 86 » A SAT approach to query optimization in mediator systems |
IDEAS
2008
IEEE
14 years 3 months ago
2008
IEEE
1 We propose a new framework for the summarization of XML document properties called EXsum (Element-wise XML summarization), which can capture statistical information of all import...
ICDE
2005
IEEE
14 years 10 months ago
2005
IEEE
The query optimizer of a database system is confronted with two aspects when handling user-defined functions (UDFs) in query predicates: the vast differences in evaluation costs b...
ICDE
2005
IEEE
14 years 10 months ago
2005
IEEE
The SQL queries produced in XML-to-SQL query translation are often unnecessarily complex, even for simple input XML queries. In this paper we argue that relational systems can do ...
ADBIS
2009
Springer
13 years 6 months ago
2009
Springer
We consider the problem of selecting views and indexes that minimize the evaluation costs of the important queries under an upper bound on the disk space available for storing the ...
ICDE
2009
IEEE
14 years 10 months ago
2009
IEEE
Materializing results from complex aggregation queries helps to significantly improve response times in OLAP servers. This problem is known as the view selection problem: choosing ...