189 search results - page 20 / 38 » Translating and Optimizing SQL Queries Having Aggregates |
SIGMOD
2002
ACM
16 years 1 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...
93
Voted
ICDT
1999
ACM
15 years 6 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...
192
Voted
SIGMOD
2006
ACM
16 years 1 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...
106
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WIDM
2004
ACM
15 years 7 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...
127
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PVLDB
2008
15 years 1 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...