964 search results - page 21 / 193 » Efficiently Ordering Query Plans for Data Integration |
135
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AAAI
2007
15 years 6 months ago
2007
The use of ontologies in various application domains, such as Data Integration, the Semantic Web, or ontology-based data management, where ontologies provide the access to large a...
157
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JUCS
2002
15 years 4 months ago
2002
: Managing image data in a database system using metadata has been practiced since the last two decades. However, describing an image fully and adequately with metadata is practica...
197
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ICDE
2011
IEEE
14 years 7 months ago
2011
IEEE
— In this paper, we study the problem of efficiently computing multiple aggregation queries over a data stream. In order to share computation, prior proposals have suggested ins...
247
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ICDE
2005
IEEE
16 years 5 months ago
2005
IEEE
Sensor networks and other distributed information systems (such as the Web) must frequently access data that has a high per-attribute acquisition cost, in terms of energy, latency...
233
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SIGMOD
2009
ACM
16 years 4 months ago
2009
ACM
SQL tuning--the attempt to improve a poorly-performing execution plan produced by the database query optimizer-is a critical aspect of database performance tuning. Ironically, as ...