4113 search results - page 417 / 823 » Watermarking Relational Databases |
296
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SIGMOD
2005
ACM
16 years 7 months ago
2005
ACM
We give semantic characterizations of the expressive power of navigational XPath (also called Core XPath) in terms of first order logic. XPath can be used to specify sets of nodes...
177
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SIGMOD
2004
ACM
16 years 7 months ago
2004
ACM
We present the Priority R-tree, or PR-tree, which is the first R-tree variant that always answers a window query using O((N/B)1-1/d + T/B) I/Os, where N is the number of ddimensio...
202
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SIGMOD
2003
ACM
16 years 7 months ago
2003
ACM
Object-oriented and object-relational DBMS support setvalued attributes, which are a natural and concise way to model complex information. However, there has been limited research...
186
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SIGMOD
2002
ACM
16 years 7 months ago
2002
ACM
We present a continuously adaptive, continuous query (CACQ) implementation based on the eddy query processing framework. We show that our design provides significant performance b...
174
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PODS
2003
ACM
16 years 7 months ago
2003
ACM
We formalize the problem of maintaining time-decaying aggregates and statistics of a data stream: the relative contribution of each data item to the aggregate is scaled down by a ...