6846 search results - page 1241 / 1370 » Querying a summary of database |
206
Voted
SIGMOD
2005
ACM
16 years 15 days ago
2005
ACM
If presented with inaccurate statistics, even the most sophisticated query optimizers make mistakes. They may wrongly estimate the output cardinality of a certain operation and th...
178
Voted
SSD
2005
Springer
16 years 13 days ago
2005
Springer
Networks often form the core of many users’ spatial databases. Networks are used to support the rapid navigation and analysis of linearly connected data such as that found in tra...
198
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SIGUCCS
2004
ACM
16 years 11 days ago
2004
ACM
Academic institutions’ dependence on web-based technologies to improve efficiency in class offerings, academic records, and office documentation is increasing at a rapid pace. T...
175
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CIKM
2004
Springer
16 years 10 days ago
2004
Springer
We study the representation, derivation and utilization of a special kind of constraints in multidatabase systems. A major challenge is when component database schemas are schemat...
210
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VLDB
2004
ACM
16 years 8 days ago
2004
ACM
At a fundamental level, the key challenge in data integration is to reconcile the semantics of disparate data sets, each expressed with a different database structure. I argue th...