An Investigation into Managing SQL-Cardinality Constraints Público

Wang, Lesi (2008)

Permanent URL: https://etd.library.emory.edu/concern/etds/0p096702n?locale=es
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Abstract

Abstract An Investigation into Managing SQL-Cardinality Constraints By Lesi Wang Constraint Satisfaction Problems (CSP) are commonly found in practice and finding effective representation language and efficient constraint solving techniques are important research areas. A recent development is the integration of CSP (specifically SAT) solvers with relational database systems to enable CSPs to be modeled using SQL, and solved within the database system. A key challenge in this integration is to keep the SAT encoding of SQL constraints small. In this work, we describe a divide-and-conquer technique for reducing the encoding of cardinality constraints. We present a number of experiments to show the improvements on performance.

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Contents

1 Introduction 1 2 Background 6 2.1 System Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.2 Case study . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.3 Improvement of SAT solver . . . . . . . . . . . . . . . . . . . . . . 9 3 Divide and conquer by traits 12 4 Experiments 20 4.1 Case studies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4.2 A Real World Example . . . . . . . . . . . . . . . . . . . . . . . . . . 22 5 Conclusion and future work 25

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