289 search results - page 4 / 58 » Control of an Extensible Query Optimizer: A Planning-Based A... |
SIGMOD
1997
ACM
13 years 11 months ago
1997
ACM
In this paper, we study a simple SQL extension that enables query writers to explicitly limit the cardinality of a query result. We examine its impact on the query optimization an...
BTW
2003
Springer
14 years 26 days ago
2003
Springer
Abstract: In order to achieve efficient execution plans for queries comprising userdefined data types and predicates, the database system has to be provided with appropriate index ...
ICMCS
2005
IEEE
14 years 1 months ago
2005
IEEE
This paper introduces a new approach of approximating the selectivity of multimedia range queries. Estimating the selectivity of a range query is a pre-requisite to optimize a mul...
DATE
2004
IEEE
13 years 11 months ago
2004
IEEE
Structured embedded databases are currently becoming an integrated part of embedded systems, thus, enabling higher standards in system automation. These embedded databases are typ...
ATMOS
2008
13 years 9 months ago
2008
We present an extension of the well-known time-expanded approach for timetable information. By remodeling unimportant stations, we are able to obtain faster query times with less s...