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    AMW
    2009
    167views Knowledge Management» more  AMW 2009»
    Using Patterns for Faster and Scalable Rewriting of Conjunctive Queries
    14 years 17 days ago
    Using Patterns for Faster and Scalable Rewriting of Conjunctive Queries
    Download  sunsite.informatik.rwth-aachen.de
    Abstract. Rewriting of conjunctive queries using views has many applications in database and data integration. We investigate ways to improve performance of rewriting and propose a...
    Ali Kiani, Nematollaah Shiri
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    AMW
    2009
    109views Knowledge Management» more  AMW 2009»
    Identifying Algebraic Properties to Support Optimization of Unary Similarity Queries
    14 years 17 days ago
    Identifying Algebraic Properties to Support Optimization of Unary Similarity Queries
    Download  sunsite.informatik.rwth-aachen.de
    Conventional operators for data retrieval are either based on exact matching or on total order relationship among elements. Neither of them is appropriate to manage complex data, s...
    Mônica Ribeiro Porto Ferreira, Agma J. M. Tr...
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    AMW
    2009
    132views Knowledge Management» more  AMW 2009»
    Checking Containment of Schema Mappings (Preliminary Report)
    14 years 17 days ago
    Checking Containment of Schema Mappings (Preliminary Report)
    Download  sunsite.informatik.rwth-aachen.de
    In data exchange, data are materialised from a source schema to a target schema, according to suitable source-to-target constraints. Constraints are also expressed on the target sc...
    Andrea Calì, Riccardo Torlone
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    AMW
    2010
    180views Knowledge Management» more  AMW 2010»
    Logic Programs for Repairing Inconsistent Dimensions in Data Warehouses
    14 years 27 days ago
    Logic Programs for Repairing Inconsistent Dimensions in Data Warehouses
    Download  sunsite.informatik.rwth-aachen.de
    A Data Warehouse (DW) is a data repository that integrates data from multiple sources and organizes the data according to a set of data structures called dimensions. Each dimension...
    Loreto Bravo, Mónica Caniupán Marile...
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    AMW
    2010
    137views Knowledge Management» more  AMW 2010»
    On the Decidability of Consistent Query Answering
    14 years 27 days ago
    On the Decidability of Consistent Query Answering
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    Abstract. Consistent query answering (CQA) is about formally characterizing and computing semantically correct answers to queries posed to a database that may fail to satisfy certa...
    Marcelo Arenas, Leopoldo E. Bertossi
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    AMW
    2010
    208views Knowledge Management» more  AMW 2010»
    Robust Clustering of Data Streams using Incremental Optimization
    14 years 27 days ago
    Robust Clustering of Data Streams using Incremental Optimization
    Download  webmining.spd.louisville.edu
    Discovering the patterns in evolving data streams is a very important and challenging task. In many applications, it is useful to detect the dierent patterns evolving over time and...
    Basheer Hawwash, Olfa Nasraoui
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    AMW
    2010
    150views Knowledge Management» more  AMW 2010»
    Run-time Optimization for Pipelined Systems
    14 years 27 days ago
    Run-time Optimization for Pipelined Systems
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    Traditional optimizers fail to pick good execution plans, when faced with increasingly complex queries and large data sets. This failure is even more acute in the context of XQuery...
    Riham Abdel Kader, Maurice van Keulen, Peter A. Bo...
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    AMW
    2010
    133views Knowledge Management» more  AMW 2010»
    What You Must Remember When Processing Data Words
    14 years 27 days ago
    What You Must Remember When Processing Data Words
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    We provide a Myhill-Nerode-like theorem that characterizes the class of data languages recognized by deterministic finite-memory automata (DMA). As a byproduct of this characteriza...
    Michael Benedikt, Clemens Ley, Gabriele Puppis
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    AMW
    2010
    119views Knowledge Management» more  AMW 2010»
    Relational Implementation of Multi-dimensional Indexes for Time Series
    14 years 27 days ago
    Relational Implementation of Multi-dimensional Indexes for Time Series
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    Tomasz Nykiel, Parke Godfrey
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    AMW
    2010
    156views Knowledge Management» more  AMW 2010»
    Minimising RDF Graphs under Rules and Constraints Revisited
    14 years 27 days ago
    Minimising RDF Graphs under Rules and Constraints Revisited
    Download  sunsite.informatik.rwth-aachen.de
    Based on practical observations on rule-based inference on RDF data, we study the problem of redundancy elimination in RDF in the presence of rules (in the form of Datalog rules) a...
    Reinhard Pichler, Axel Polleres, Sebastian Skritek...
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