1860 search results - page 147 / 372 » A Model of Queries for Object-Oriented Databases |
243
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SIGMOD
2008
ACM
16 years 5 months ago
2008
ACM
Supporting ranking queries in database systems has been a popular research topic recently. However, there is a lack of study on supporting ranking queries in data warehouses where...
166
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ICDE
2005
IEEE
15 years 10 months ago
2005
IEEE
Current federated systems deploy cost-based query optimization mechanisms; i.e., the optimizer selects a global query plan with the lowest cost to execute. Thus, cost functions in...
218
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VLDB
2008
ACM
16 years 5 months ago
2008
ACM
This paper studies aggregate search in transaction time databases. Specifically, each object in such a database can be modeled as a horizontal segment, whose y-projection is its s...
142
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VLDB
2007
ACM
15 years 11 months ago
2007
ACM
Intuitively, aggressive work sharing among concurrent queries in a database system should always improve performance by eliminating redundant computation or data accesses. We show...
260
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SIGMOD
2008
ACM
16 years 5 months ago
2008
ACM
A major problem in detecting events in streams of data is that the data can be imprecise (e.g. RFID data). However, current state-ofthe-art event detection systems such as Cayuga ...