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Discovering OLAP dimensions in semi-structured data

Svetlana Mansmann, Nafees Ur Rehman, Andreas Weiler, Marc H. Scholl
2012 Proceedings of the fifteenth international workshop on Data warehousing and OLAP - DOLAP '12  
or semi-structured data.  ...  Transforming the input into a set of measures distributed along a set of uniformly structured dimensions may be unrealistic for applications dealing with semi-structured data.  ...  CONCLUSIONS In this work we proposed to extract multidimensional datacubes for OLAP from semi-structured data sets and to extend the resulting model by including dynamic categories and hierarchies discovered  ... 
doi:10.1145/2390045.2390048 dblp:conf/dolap/MansmannRWS12 fatcat:vewta2bz2zahzkapuejgg3tsbq

Discovering OLAP dimensions in semi-structured data

Svetlana Mansmann, Nafees Ur Rehman, Andreas Weiler, Marc H. Scholl
2014 Information Systems  
or semi-structured data.  ...  Transforming the input into a set of measures distributed along a set of uniformly structured dimensions may be unrealistic for applications dealing with semi-structured data.  ...  CONCLUSIONS In this work we proposed to extract multidimensional datacubes for OLAP from semi-structured data sets and to extend the resulting model by including dynamic categories and hierarchies discovered  ... 
doi:10.1016/j.is.2013.09.002 fatcat:377h5bhyvvfg7j5j6cbgo7xh3a

QB2OLAP: Enabling OLAP on Statistical Linked Open Data

Jovan Varga, Lorena Etcheverry, Alejandro A. Vaisman, Oscar Romero, Torben Bach Pedersen, Christian Thomsen
2016 2016 IEEE 32nd International Conference on Data Engineering (ICDE)  
In this demo, we present QB2OLAP, a tool for enabling OLAP on existing QB data.  ...  The RDF Data Cube (QB) vocabulary, the current standard for statistical data publishing, however, lacks key MD concepts such as dimension hierarchies and aggregate functions.  ...  QB2OLAP semi-automatically discovers dimension hierarchies to enrich the original data set, and automatically translates QL queries into SPARQL and executes them on an endpoint.  ... 
doi:10.1109/icde.2016.7498341 dblp:conf/icde/VargaEVRPT16 fatcat:zapuhplf4zauhh3lnxbpl6sesq

Discovering Dynamic Classification Hierarchies in OLAP Dimensions [chapter]

Nafees Ur Rehman, Svetlana Mansmann, Andreas Weiler, Marc H. Scholl
2012 Lecture Notes in Computer Science  
These constraints appear too rigid for many data sets, especially semi-structured ones, such as user-generated content in social networks and other web applications.  ...  Discovered elements are dynamic by nature and evolve along with the underlying data set.  ...  The dataset delivered by the Twitter Streaming API is semi-structured using the JavaScript Object Notation (JSON).  ... 
doi:10.1007/978-3-642-34624-8_48 fatcat:lmynmjnewbev7krdfpeadz4rry

Towards a Data Warehouse Architecture for Managing Big Data Evolution

Darja Solodovnikova, Laila Niedrite
2018 Proceedings of the 7th International Conference on Data Science, Technology and Applications  
to changes in the underlying data sources.  ...  However, due to the emergence of big data technologies and the necessity to perform OLAP analysis over big data, innovative methods must be developed also to support evolution of data warehouse that is  ...  /VIAA/1/16/057 "Handling Adaptation of Big Data Warehouse" and by University of Latvia project No. AAP2016/B032 "Innovative information technologies".  ... 
doi:10.5220/0006886100630070 dblp:conf/data/SolodovnikovaN18 fatcat:fzh6jms2lzgq5kqnrx7vxe5zvu

Combining OLAP and information networks for bibliographic data analysis: a survey

Sabine Loudcher, Wararat Jakawat, Edmundo Pavel Soriano Morales, Cécile Favre
2015 Scientometrics  
In Business Intelligence, OLAP is a technology supported by data warehousing systems. It provides tools for analyzing data according to multiple dimensions and multiple hierarchical levels.  ...  Originally, OLAP was introduced to analyze structured data. However, in this paper, we wonder if, by combining OLAP and information networks, we can provide a new way of analyzing bibliographic data.  ...  Prediction Table 2 2 Comparison between traditional OLAP and Graph OLAP Traditional OLAP Graph OLAP Data Relational or semi-structured data Interconnected objects textual or XML data of different  ... 
doi:10.1007/s11192-015-1539-0 fatcat:unu6qfj4ebasnf3zq2vgesc63m

Using Semantic Web Technologies for Exploratory OLAP: A Survey

Alberto Abello, Oscar Romero, Torben Bach Pedersen, Rafael Berlanga, Victoria Nebot, Maria Jose Aramburu, Alkis Simitsis
2015 IEEE Transactions on Knowledge and Data Engineering  
, resulting in a new type of OLAP, exploratory OLAP.  ...  However, the most interesting OLAP queries can no longer be answered on internal data alone, external data must also be discovered (most often on the Web), acquired, integrated, and (analytically) queried  ...  For the Structuredness criterion, Traditional OLAP tends to use mostly Structured data, while Exploratory cases also use Semi-structured and Unstructured data sources (e.g., text, social media data, etc  ... 
doi:10.1109/tkde.2014.2330822 fatcat:vkgifzmlvjeipmudldxfxqwci4

OLAPing social media

Nafees Ur Rehman, Andreas Weiler, Marc H. Scholl
2013 Proceedings of the 2013 IEEE/ACM International Conference on Advances in Social Networks Analysis and Mining - ASONAM '13  
The capabilities of OLAP are extended by semantic enrichment of the underlying dataset to discover new measures and dimensions for building data cubes and by supporting up-todate analysis of the evolving  ...  warehousing system and by exploiting various knowledge discovery techniques to deal with semi-structured and unstructured data from social media.  ...  In OLAP tools, dimension are presented in the form of hierarchical data navigation structures [8] .  ... 
doi:10.1145/2492517.2500273 dblp:conf/asunam/RehmanWS13 fatcat:4tyig4m4ozh77d66vjjeyr2ove

Towards Exploratory OLAP Over Linked Open Data – A Case Study [chapter]

Dilshod Ibragimov, Katja Hose, Torben Bach Pedersen, Esteban Zimányi
2015 Lecture Notes in Business Information Processing  
In this paper we describe a framework for so-called Exploratory OLAP over RDF sources. We propose a system that uses a multidimensional schema of the OLAP cube expressed in RDF vocabularies.  ...  Data Warehouses (DW) and Online Analytical Processing (OLAP) tools are used to store and analyze data.  ...  Acknowledgment This research is partially funded by the Erasmus Mundus Joint Doctorate in "Information Technologies for Business Intelligence -Doctoral College (IT4BI-DC)".  ... 
doi:10.1007/978-3-662-46839-5_8 fatcat:viwmlikm7rfmfocuhtk34kqbhi

XML Warehousing and OLAP [article]

Hadj Mahboubi, Jérôme Darmont
2017 arXiv   pre-print
We also discuss the issues and future trends in this area and illustrate this topic by presenting the design of a unified, XML data warehouse architecture and a set of XOLAP operators expressed in an XML  ...  The aim of this article is to present an overview of the major XML warehousing approaches from the literature, as well as the existing approaches for performing OLAP analyses over XML data (which is termed  ...  In addition, recent efforts aim at performing OLAP analyses over XML data.  ... 
arXiv:1701.08612v1 fatcat:ne65xezff5hltdo2sbdwlr6lay

X-WACoDa: An XML-based approach for Warehousing and Analyzing Complex Data [article]

Hadj Mahboubi, Sabine Loudcher, Jérôme Darmont
2017 arXiv   pre-print
Data warehousing and OLAP applications must nowadays handle complex data that are not only numerical or symbolic. The XML language is well-suited to logically and physically represent complex data.  ...  In this paper, we propose a unified XML warehouse reference model that synthesizes and enhances related work, and fits into a global XML warehousing and analysis approach we have developed.  ...  Furthermore, we can benefit from the semi-structured data model's flexibility, extensibility and richness.  ... 
arXiv:1701.08033v1 fatcat:dfuzbfzhizhapnp5kuqxtujq6e

Solutions for decision support in university management

Andrei STANCIU, Mihai FLORIN, Cristina RÃDULESCU, Ofelia ALECA
2009 Economia: Seria Management  
The contributions consist in designing a data warehouse model and models of OLAP analysis to assist decision in university management.  ...  The paper proposes an overview of decision support systems in order to define the role of a system to assist decision in university management.  ...  In OLAP systems, data cubes integrate multiple perspectives on business data, so they may have as many dimensions as the business model allows.  ... 
doaj:0eeccf95c51243ac98e5cc3915e98de6 fatcat:a5zaba4fffgqjf5ndg6rrovqry

Warehousing complex data from the Web [article]

Omar Boussaid , Sabine Loudcher
2017 arXiv   pre-print
Our approach includes the integration of complex data in an ODS, under the form of XML documents; their dimensional modeling and storage in an XML data warehouse; and their analysis with combined OLAP  ...  The data warehousing and OLAP technologies are now moving onto handling complex data that mostly originate from the Web.  ...  Jaroslav Pokorný, the editors, for inviting them to publish an article in this special issue.  ... 
arXiv:1701.00398v1 fatcat:64yhgypd4fdlrhy7gwobtljs7y

Building a Data Warehouse for Twitter Stream Exploration

N. U. Rehman, S. Mansmann, A. Weiler, M. H. Scholl
2012 2012 IEEE/ACM International Conference on Advances in Social Networks Analysis and Mining  
We employ the well established data warehousing technology with its underlying multidimensional data model, ETL routine for loading and consolidating data from different sources, OLAP functionality for  ...  In this work we describe the process of transforming the original stream into a set of related multidimensional cubes and demonstrate how the resulting data warehouse can be used for solving a variety  ...  The main challenge of implementing a DW for Twitter analysis lies in providing a mapping of the semi-structured original data stream delivered by the Twitter APIs into a rigidly structured multidimensional  ... 
doi:10.1109/asonam.2012.230 dblp:conf/asunam/RehmanMWS12 fatcat:3phon3joinbjjdpdeev5i5l6ne

Building MultiView Analyst Profile From Multidimensional Query Logs: From Consensual to Conflicting Preferences [article]

Eya Ben Ahmed, Ahlem Nabli, Faïez Gargouri
2012 arXiv   pre-print
In this paper, we introduce a new approach for user profile construction from OLAP query logs. The key idea is to learn the user's preferences by drawing the evidence from OLAP logs.  ...  In fact, the analyst preferences are clustered into three main pools : (i) consensual or non conflicting preferences referring to same preferences for all analysts; (ii) semi-conflicting preferences corresponding  ...  The later is used in the Where clause and restricts the result data. Any dimension that does not appear on an axis in the SELECT clause can be named on the slicer.  ... 
arXiv:1203.3589v1 fatcat:wtbbqywoonfy5hm4n42vvexjli
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