Efficient analytical queries on semantic web data cubes

Etcheverry, Lorena; Vaisman, Alejandro Ariel

artículo de publicación periódica.page.titleprefix
Efficient analytical queries on semantic web data cubes

dc.contributor.author	Etcheverry, Lorena
dc.contributor.author	Vaisman, Alejandro Ariel
dc.date.accessioned	2019-09-06T13:20:52Z
dc.date.available	2019-09-06T13:20:52Z
dc.date.issued	2017-12
dc.description.abstract	"The amount of multidimensional data published on the semantic web (SW) is constantly increasing, due to initiatives such as Open Data and Open Government Data, among other ones. Models, languages, and tools, that allow obtaining valuable information e ciently, are thus required. Multidimensional data are typically represented as data cubes, and exploited using Online Analytical Processing (OLAP) techniques. The RDF Data Cube Vocabulary, also denoted QB, is the current W3C standard to represent statistical data on the SW. Given that QB does not include key features needed for OLAP analysis, in previous work we have proposed an extension, denoted QB4OLAP, to overcome this problem without the need of modifying already published data. Once data cubes are appropriately represented on the SW, we need mechanisms to analyze them. However, in the current state-of-the-art, writing e cient analytical queries over SW data cubes demands a deep knowledge of standards like RDF and SPARQL. These skills are unlikely to be found in typical analytical users. Further, OLAP languages like MDX are far from being easily understood by the final user. The lack of friendly tools to exploit multidimensional data on the SW is a barrier that needs to be broken to promote the publication of such data. This is the problem we address in this paper. Our approach is based on allowing analytical users to write queries using what they know best: OLAP operations over data cubes, without dealing with SW technicalities. For this, we devised CQL (standing for Cube Query Language), a simple, high-level query language that operates over data cubes. Taking advantage of structural metadata provided by QB4OLAP, we translate CQL queries into SPARQL ones. Then, we propose query improvement strategies to produce e cient SPARQL queries, adapting general-purpose SPARQL query optimization techniques. We evaluate our implementation using the Star-Schema benchmark, showing that our proposal outperforms others. The QB4OLAP toolkit,a web application that allows exploring and querying (using CQL) SW data cubes, completes our contributions."	en
dc.identifier.issn	1861-2032
dc.identifier.uri	http://ri.itba.edu.ar/handle/123456789/1743
dc.language.iso	en	en
dc.relation	info:eu-repo/semantics/altIdentifier/doi/10.1007/s13740-017-0082-y
dc.relation	info:eu-repo/grantAgreement/ANPCyT/PICT/2014-0787/AR. Ciudad Autónoma de Buenos Aires
dc.subject	OLAP	en
dc.subject	WEB SEMANTICA	es
dc.subject	ALMACENES DE DATOS	es
dc.subject	LENGUAJES DE CONSULTA	es
dc.subject	RDF	en
dc.title	Efficient analytical queries on semantic web data cubes	en
dc.type	Artículos de Publicaciones Periódicas	es
dc.type	info:eu-repo/semantics/acceptedVersion
dspace.entity.type	Artículo de Publicación Periódica
itba.description.filiation	Fil: Etcheverry, Lorena. Universidad de la República; Uruguay.
itba.description.filiation	Fil: Vaisman, Alejandro Ariel. Instituto Tecnológico de Buenos Aires; Argentina.