Exploració per autor "Hewasinghage, Moditha Lakshan Dharmasir"

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    • A cost model for random access queries in document stores 

      Hewasinghage, Moditha Lakshan Dharmasir; Abelló Gamazo, Alberto; Varga, Jovan; Zimányi, Esteban (2021-07)
      Article
      Accés obert
      Document stores have become one of the key NoSQL storage solutions. They have been widely adopted in different domains due to their ability to store semi-structured data and expressive query capabilities. However, ...

    • A frequent named entities-based approach for interpreting reputation in Twitter 

      Bennacer Seghouani, Nacéra; Bugiotti, Francesca; Hewasinghage, Moditha Lakshan Dharmasir; Isaj, Suela; Quercini, Gianluca (2018-06-01)
      Article
      Accés obert
      Twitter is a social network that provides a powerful source of data. The analysis of those data offers many challenges among those stands out the opportunity to find reputation of a product, a person or any other entity ...

    • Automated database design for document stores with multicriteria optimization 

      Hewasinghage, Moditha Lakshan Dharmasir; Nadal Francesch, Sergi; Abelló Gamazo, Alberto; Zimányi, Esteban (Springer, 2023-03-11)
      Article
      Accés obert
      Document stores have gained popularity among NoSQL systems mainly due to the semi-structured data storage structure and the enhanced query capabilities. The database design in document stores expands beyond the first normal ...

    • DocDesign 2.0: Automated database design for document stores with multi-criteria optimization 

      Hewasinghage, Moditha Lakshan Dharmasir; Nadal Francesch, Sergi; Abelló Gamazo, Alberto (OpenProceedings, 2021)
      Comunicació de congrés
      Accés obert
      We present DocDesign 2.0, a novel system that supports database design for document stores. DocDesign 2.0 automatically generates a document store design driven by a query workload and a set of optimization objectives. In ...

    • 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 ...

    • 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., ...

    • Physical database design in document stores 

      Hewasinghage, Moditha Lakshan Dharmasir (Universitat Politècnica de Catalunya, 2022-07-12)
      Tesi
      Accés obert
      NoSQL is an umbrella term used to classify alternate storage systems to the traditional Relational Database Management Systems (RDBMSs). Among these, Document stores have gained popularity mainly due to the semi-structured ...