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MDBE: automatic multidimensional modeling”. ER (2008)

by O Romero, A Abelló
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An Empirical Evaluation of a Historical Data Warehouse

by Carlos Neil , Marcelo De Vincenzi , Claudia Pons , 2013
"... Abstract. Computing is widely regarded as a scientific discipline that emphasizes on three different perspectives: mathematics, present in the development of formalisms, theories and algorithms; engineering, linked to the goal of making things better, faster, smaller, cheaper and, finally, the scie ..."
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Abstract. Computing is widely regarded as a scientific discipline that emphasizes on three different perspectives: mathematics, present in the development of formalisms, theories and algorithms; engineering, linked to the goal of making things better, faster, smaller, cheaper and, finally, the science that can be defined as the activity to develop general and predictive theories that allow these theories to be evaluated and tested. However, research in software engineering rarely describes explicitly its research paradigms and standards to assess the quality of its results. Due to a growing understanding in the computer science community that empirical studies are needed to improve processes, methods and tools for the development and maintenance of software, an emerging area in software engineering is developed: the Empirical Software Engineering. This subarea is one step down in the claims of scientificity but it aims to address this shortcoming. The objective of this work is to conduct an empirical corroboration for developing a method of a Historical Data Warehouse, the temporal data model and the associated query interface.
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...t of possible queries is established by identifying common query patterns. The Query Graphic consists of a root node that represents the main fact and a set of connected nodes, each of which represents different levels of hierarchies, measures, temporal attributes, temporal entities and temporal interrelation (24). 3.3 Design Method for a Historical Data Warehouse Several methods have been proposed that allow to derive the conceptual multidimensional schema from data sources within the organization and/or from the user’s requirements (see (15, 25)), most of these methods must be done manually (26). A solution to this problem is proposed by Model Driven Software Development, this approach has become a new paradigm of software development that promises improvements in the software construction based on a model-driven process and supported by powerful tools. In the Model Driven Software Development, the software construction is done through a model-driven process and supported by powerful tools that generate code from them. This new paradigm aims to improve productivity and software quality generated by reducing the semantic leap between the problem domain and the solution (27). The propo...

Design method for a Historical Data Warehouse, explicit valid time in multidimensional models

by Carlos G Neil , Marcelo E De Vincenzi , Claudia F Pons , 2014
"... RESUMEN Presentamos una nueva estructura de almacenamiento que denominamos DW Histórico y que contiene, explícitamente, el tiempo válido. Nuestra propuesta combina, en un modelo integrado, una Base de Datos Histórica y un DW. El objetivo del modelo propuesto es resolver las limitaciones temporales ..."
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RESUMEN Presentamos una nueva estructura de almacenamiento que denominamos DW Histórico y que contiene, explícitamente, el tiempo válido. Nuestra propuesta combina, en un modelo integrado, una Base de Datos Histórica y un DW. El objetivo del modelo propuesto es resolver las limitaciones temporales de las estructuras multidimensionales tradicionales. Aunque el DW Temporal considera, además de la dimensión temporal, otros aspectos vinculados con el tiempo, este modelo solo contempla los cambios que se producen en las dimensiones y jerarquías. Por consiguiente, en virtud de contemplar la necesidad de registrar valores que permitan evaluar tendencias, variaciones, máximos y mínimos, un problema a resolver es cómo registrar, en el diseño de la estructura multidimensional, la variación temporal de los valores de entidades, atributos e interrelaciones, ya que, si bien sabemos que los datos necesarios están almacenados, los mecanismos de búsqueda temporal serían complejos. El diseño del DW Histórico está enmarcado en el enfoque del Desarrollo de Software Dirigido por Modelos, una estrategia que permite, mediante sucesivas transformaciones automáticas, obtener una implementación del modelo multidimensional en un Sistema Administrador de Base de Datos Relacionales (SABDR). Palabras clave: Método de diseño, desarrollo de software dirigido por modelos, data warehouse, base de datos histórica, tiempo válido. ABSTRACT We present a new storage structure that contains the explicit valid time called Historical DW. This proposal combines a Historical Data Base and a DW in one integrated model. The objective of this model is to solve the temporal limitations of the traditional multidimensional structures. Although the Temporal DW considers, besides the temporal dimension, other aspects related to time, this model only takes into account the changes that occur in the DW
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...onal structure, considering the need for registering values that allow to evaluate trends, variations, maximum and minimum values, is how we shape the values of entities, attributes or relationships that may vary in time in the design of the multidimensional structure; since, although the needed data of information was stored, the temporal search mechanisms would be complex [21]. Several methods have been proposed that allow to derive the conceptual multidimensional schema from data sources of the organization and/or of the user’s requirements (see [7, 32]); most of them must be done manually [26]. A solution to this problem is proposed by Model Driven Software Development, this approach has become a new paradigm of software development that promises improvements in the software construction based on a model-driven process and supported by powerful tools. This new paradigm aims to improve productivity and software quality generated by reducing the semantic leap between the problem domain and the solution [25]. The proposed design method consists in successive automatic and semiautomatic transformations of models, that begin with an ER model and that finally allow to obtain a temporal m...

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