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CMA
2010
68views more  CMA 2010»
13 years 2 months ago
Maximum cardinality resonant sets and maximal alternating sets of hexagonal systems
It is shown that the Clar number can be arbitrarily larger than the cardinality of a maximal alternating set. In particular, a maximal alternating set of a hexagonal system need n...
Sandi Klavzar, Khaled Salem, Andrej Taranenko
PODS
2010
ACM
207views Database» more  PODS 2010»
13 years 10 months ago
Understanding cardinality estimation using entropy maximization
Cardinality estimation is the problem of estimating the number of tuples returned by a query; it is a fundamentally important task in data management, used in query optimization, ...
Christopher Ré, Dan Suciu
EDBT
2006
ACM
120views Database» more  EDBT 2006»
14 years 5 months ago
Query Planning in the Presence of Overlapping Sources
Navigational queries on Web-accessible life science sources pose unique query optimization challenges. The objects in these sources are interconnected to objects in other sources, ...
Jens Bleiholder, Samir Khuller, Felix Naumann, Lou...
DEXA
2009
Springer
127views Database» more  DEXA 2009»
13 years 12 months ago
The Real Performance Drivers behind XML Lock Protocols
Abstract. Fine-grained lock protocols should allow for highly concurrent transaction processing on XML document trees, which is addressed by the taDOM lock protocol family enabling...
Sebastian Bächle, Theo Härder