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    • Managing polyglot systems metadata with hypergraphs 

      Hewasinghage, Moditha Lakshan Dharmasir; Abelló Gamazo, Alberto; Varga, Jovan; Zimányi, Esteban (Elsevier, 2021-07)
      Article
      Accés obert
      A single type of data store can hardly fulfill every end-user requirements in the NoSQL world. Therefore, polyglot systems use different types of NoSQL datastores in combination. However, the heterogeneity of the data ...

    • Managing polyglot systems metadata with hypergraphs 

      Hewasinghage, Moditha Lakshan Dharmasir; Varga, Jovan; Abelló Gamazo, Alberto; Zimányi, Esteban (2018)
      Text en actes de congrés
      Accés obert
      A single type of data store can hardly fulfill every end-user requirements in the NoSQL world. Therefore, polyglot systems use different types of NoSQL datastores in combination. However, the heterogeneity of the data ...

    • Mapreduce performance model for Hadoop 2.x 

      Glushkova, Daria; Jovanovic, Petar; Abelló Gamazo, Alberto (Elsevier, 2019-01)
      Article
      Accés obert
      MapReduce is a popular programming model for distributed processing of large data sets. Apache Hadoop is one of the most common open-source implementations of such paradigm. Performance analysis of concurrent job executions ...

    • MapReduce performance models for Hadoop 2.x 

      Glushkova, Daria; Jovanovic, Petar; Abelló Gamazo, Alberto (CEUR-WS.org, 2017)
      Text en actes de congrés
      Accés obert
      MapReduce is a popular programming model for distributed processing of large data sets. Apache Hadoop is one of the most common open-source implementations of such paradigm. Performance analysis of concurrent job executions ...

    • MDBE: Automatic Multidimensional Design 

      Romero Moral, Óscar; Abelló Gamazo, Alberto (Springer, 2008)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      The goal of this demonstration is to present MDBE, a tool implementing our methodology for automatically deriving multidimensional schemas from relational sources, bearing in mind the end-user requirements. Our approach ...

    • MDBE: una herramienta automática para el modelado multidimensional 

      Romero Moral, Óscar; Abelló Gamazo, Alberto (Thomson Paraninfo, 2007)
      Comunicació de congrés
      Accés obert
      Los sistemas Data Warehousing tienen como objetivo ayudar en la toma de decisiones de las organizaciones. Para ello, estos sistemas inte­gran y homogenizan los datos de la organiza­ción en un Data Warehouse (DW), con el ...

    • MDM: governing evolution in big data ecosystems 

      Nadal Francesch, Sergi; Abelló Gamazo, Alberto; Romero Moral, Óscar; Vansummeren, Stijn; Vassiliadis, Panos (OpenProceedings, 2018)
      Comunicació de congrés
      Accés obert
      On-demand integration of multiple data sources is a critical requirement in many Big Data settings. This has been coined as the data variety challenge, which refers to the complexity of dealing with an heterogeneous set ...

    • Measuring discord among multidimensional data sources 

      Abelló Gamazo, Alberto; Cheney, James (CEUR-WS.org, 2022)
      Comunicació de congrés
      Accés obert
      Data integration is a classical problem in databases, typically decomposed into schema matching, entity matching and record merging. To solve the latter, it is mostly assumed that ground truth can be determined, either as ...

    • Mòdul de creació d'equips per a Moodle 

      Abelló Gamazo, Alberto; Vallès, Adrià; Urpí Tubella, Antoni; Quer, Carme; Casany Guerrero, María José; Burgués Illa, Xavier (Universitat Politècnica de Catalunya. Institut de Ciències de l'Educació, 2010-06-04)
      Comunicació de congrés
      Accés obert
      Un dels punts forts de Moodle és la promoció de la participació, ja que permet oferir els continguts de l’assignatura de forma dinàmica i plantejar exercicis de forma ràpida i senzilla. El mòdul de creació d’equips que hem ...

    • Multi-star conceptual schemas for OLAP systems 

      Abelló Gamazo, Alberto; Samos, J; Saltor Soler, Félix Enrique (2001-10)
      Report de recerca
      Accés obert
      OLAP tools divide concepts based on whether they are used as analysis dimensions, or are the fact subject of analysis, which gives rise to star shape schemas. Operations are always provided to navigate inside such star ...

    • NOSQL design for analytical workloads: Variability matters 

      Herrero Otal, Víctor; Abelló Gamazo, Alberto; Romero Moral, Óscar (Springer, 2016)
      Text en actes de congrés
      Accés obert
      Big Data has recently gained popularity and has strongly questioned relational databases as universal storage systems, especially in the presence of analytical workloads. As result, co-relational alternatives, commonly ...

    • On the mismatch between multidimensionality and SQL 

      Romero Moral, Óscar; Abelló Gamazo, Alberto (2006-06)
      Report de recerca
      Accés obert
      ROLAP tools are intended to ease information analysis and navigation through the whole Data Warehouse. These tools automatically generate a query according to the multidimensional operations performed by the end-user, using ...

    • On the performance impact of using JSON, beyond impedance mismatch 

      Hewasinghage, Moditha Lakshan Dharmasir; Nadal Francesch, Sergi; Abelló Gamazo, Alberto (Springer, 2020)
      Text en actes de congrés
      Accés obert
      NOSQL 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., ...

    • On the predictive power of meta-features in OpenML 

      Bilalli, Besim; Abelló Gamazo, Alberto; Aluja Banet, Tomàs (2017-12-20)
      Article
      Accés obert
      The demand for performing data analysis is steadily rising. As a consequence, people of different profiles (i.e., non-experienced users) have started to analyze their data. However, this is challenging for them. A key step ...

    • On-line analytical processing 

      Abelló Gamazo, Alberto; Romero Moral, Óscar (Springer, 2017-01-21)
      Capítol de llibre
      Accés obert
      On-line analytical processing (OLAP) describes an approach to decision support, which aims to extract knowledge from a data warehouse, or more specifically, from data marts. Its main idea is providing navigation through ...

    • Open access semantic aware business intelligence 

      Romero Moral, Óscar; Abelló Gamazo, Alberto (Springer, 2013)
      Text en actes de congrés
      Accés obert
      The vision of an interconnected and open Web of data is, still, a chimera far from being accomplished. Fortunately, though, one can find several evidences in this direction and despite the technical challenges behind such ...

    • PatternLens: Inferring evolutive patterns from web API usage logs 

      Koçi, Rediana; Franch Gutiérrez, Javier; Jovanovic, Petar; Abelló Gamazo, Alberto (Springer, 2021)
      Text en actes de congrés
      Accés obert
      The use of web Application Programming Interfaces (WAPIs) has experienced a boost in recent years. Developers (i.e., WAPI consumers) are continuously relying on third-party WAPIs to incorporate certain features into their ...

    • POIESIS: A tool for quality-aware ETL process redesign 

      Theodorou, Vasileios; Abelló Gamazo, Alberto; Thiele, Maik; Lehner, Wolfgang (2015)
      Text en actes de congrés
      Accés obert
      We present a tool, called POIESIS, for automatic ETL process enhancement. ETL processes are essential data-centric activities in modern business intelligence environments and they need to be examined through a viewpoint ...

    • Potenciació del Moodle per a donar suport a l'aprenentatge semi-presencial 

      Abelló Gamazo, Alberto; Urpí Tobella, Antoni; Rodríguez, Elena; Burgués Illa, Xavier; Quer, Carme; Casany Guerrero, María José; Martín Escofet, Carme; Teniente López, Ernest; Muñoz, Jorge; Munné, Enric (2009-02-12T12:05:55Z)
      Text en actes de congrés
      Accés obert
      L’objectiu general del projecte era permetre que els alumnes preparessin les sessions de pràctiques amb antelació i de forma autònoma i fomentar que reintentessin els exercicis permetent-los millorar les seves qualificacions. ...

    • PRESISTANT : data pre-processing assistant 

      Bilalli, Besim; Abelló Gamazo, Alberto; Aluja Banet, Tomàs; Munir, Rana Faisal; Wrembel, Robert (Springer, 2019)
      Comunicació de congrés
      Accés obert
      A concrete classification algorithm may perform differently on datasets with different characteristics, e.g., it might perform better on a dataset with continuous attributes rather than with categorical attributes, or the ...