712 search results - page 99 / 143 » Decoupled Query Optimization for Federated Database Systems |
102
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DEXA
2004
Springer
15 years 7 months ago
2004
Springer
Data integration is a significant challenge: relevant data objects are split across multiple information sources, and often owned by different organizations. The sources represent...
136
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VLDB
2005
ACM
15 years 7 months ago
2005
ACM
Developing cost models for query optimization is significantly harder for XML queries than for traditional relational queries. The reason is that XML query operators are much mor...
140
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EDBT
2009
ACM
15 years 8 months ago
2009
ACM
Data stream management systems usually have to process many long-running queries that are active at the same time. Multiple queries can be evaluated more efficiently together tha...
116
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SSD
2005
Springer
15 years 7 months ago
2005
Springer
Abstract. Query optimization is an important functionality of modern database systems and often based on estimating the selectivity of queries before actually executing them. Well-...
129
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ER
2008
Springer
15 years 3 months ago
2008
Springer
Access limitations may occur when querying data sources over the web or heterogeneous data sources presented as relational tables: this happens, for instance, in Data Exchange and ...