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296
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PODS
2004
ACM
16 years 6 months ago
2004
ACM
A schema mapping is a specification that describes how data structured under one schema (the source schema) is to be transformed into data structured under a different schema (the...
175
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PODS
2006
ACM
16 years 6 months ago
2006
ACM
We study the randomized version of a computation model (introduced in [9, 10]) that restricts random access to external memory and internal memory space. Essentially, this model c...
185
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PODS
2007
ACM
16 years 6 months ago
2007
ACM
Bounded treewidth and Monadic Second Order (MSO) logic have proved to be key concepts in establishing fixed-parameter tractability results. Indeed, by Courcelle's Theorem we ...
177
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PODS
2008
ACM
16 years 6 months ago
2008
ACM
In the study of data exchange one usually assumes an openworld semantics, making it possible to extend instances of target schemas. An alternative closed-world semantics only move...
190
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PODS
2008
ACM
16 years 6 months ago
2008
ACM
We revisit the classical chase procedure, studying its properties as well as its applicability to standard database problems. We settle (in the negative) the open problem of decid...