Exploració per tema "Query processing"
Ara es mostren els items 1-6 de 6
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An inside analysis of a genetic-programming based optimizer
(Institute of Electrical and Electronics Engineers, 2006)
Text en actes de congrés
Accés obertThe use of evolutionary algorithms has been proposed as a powerful random search strategy to solve the join order problem. Specifically, genetic programming used in query optimization has been proposed as an alternative ... -
Horn query learning with multiple refinement
(2008)
Article
Accés restringit per política de l'editorialIn this paper we try to understand the heuristics that underlie the decisions made by the Horn query learning algorithm proposed in [1]. We take advantage of our explicit representation of such heuristics in order to ... -
On the performance impact of using JSON, beyond impedance mismatch
(Springer, 2020)
Text en actes de congrés
Accés obertNOSQL database management systems adopt semi-structured data models, such as JSON, to easily accommodate schema evolution and overcome the overhead generated from transforming internal structures to tabular data (i.e., ... -
Query containment in entity SQL
(2013)
Comunicació de congrés
Accés restringit per política de l'editorialWe describe a software architecture we have developed for a constructive containment checker of Entity SQL queries defined over extended ER schemas expressed in Microsoft's Entity Data Model. Our application of interest ... -
Updating DL-Lite ontologies through first-order queries
(Springer, 2016)
Text en actes de congrés
Accés obertIn this paper we study instance-level update in DL-LiteA, the description logic underlying the OWL 2 QL standard. In particular we focus on formula-based approaches to ABox insertion and deletion. We show that DL-LiteA, ... -
Validation of mappings between schemas
(2007-06)
Report de recerca
Accés obertMappings between schemas are key elements in several contexts such as data exchange, data integration, peer data management systems, etc. In all these contexts, the process of designing a mapping requires the participation ...