189 search results - page 20 / 38 » Translating and Optimizing SQL Queries Having Aggregates |
SIGMOD
2002
ACM
14 years 7 months ago
2002
ACM
Statistics play an important role in influencing the plans produced by a query optimizer. Traditionally, optimizers use statistics built over base tables and assume independence b...
ICDT
1999
ACM
13 years 12 months ago
1999
ACM
In data integration systems, queries posed to a mediator need to be translated into a sequence of queries to the underlying data sources. In a heterogeneous environment, with sour...
SIGMOD
2006
ACM
14 years 7 months ago
2006
ACM
The area of automatic selection of physical database design to optimize the performance of a relational database system based on a workload of SQL queries and updates has gained p...
WIDM
2004
ACM
14 years 1 months ago
2004
ACM
The use of relational database management systems (RDBMSs) to store and query XML data has attracted considerable interest with a view to leveraging their powerful and reliable da...
PVLDB
2008
13 years 7 months ago
2008
Many commercial RDBMSs employ cost-based query optimization exploiting dynamic programming (DP) to efficiently generate the optimal query execution plan. However, optimization tim...