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OLAP and object data models represent different logical concepts and structures, and therefore separate database systems with different query languages were developed based on these models. We show in this paper that it is desirable and possible to combine these models to represent realistic modeling requirements. We define in this paper an OLAP-object data model that combines the main characteristics...
Data marts and caching are two closely related concepts in the domain of multi-dimensional data. Both store pre-computed data to provide fast response times for complex OLAP queries, and for both it must be guaranteed that every query can be completely processed. However, they differ extremely in their update behaviour which we utilise to build a specific data mart extended by cache semantics. In...
An innovative technique supporting accuracy control in compressed multidimensional data cubes is presented in this paper. The proposed technique can be efficiently used in QoA-based OLAP tools, where OLAP users/applications and DW servers are allowed to mediate on the accuracy of (approximate) answers, similarly to what happens in QoS-based systems for the quality of services. The compressed data...
Large scale scientific data is often stored in scientific data formats such as FITS, netCDF and HDF. These storage formats are of particular interest to the scientific user community since they provide multi-dimensional storage and retrieval. However, one of the drawbacks of these storage formats is that they do not support semantic indexing which is important for interactive data analysis where scientists...
In this paper, we introduce the partial vector approximation file, an extension of the well known vector approximation file that is constructed to efficiently answer partial similarity queries in any possible subspace which is not known beforehand. The idea of the partial VA-file is to divide the VA-file into a separate file for each dimension and only load the dimensions that are necessary to answer...
Biological Web data sources have now become essential information sources for researchers. However, their use is tedious, labor-intensive, repetitive, and possibly involve the integration of data from multiple Web data sources. In this paper, as a first step towards the full integration of Web data sources, we propose a framework that allows an integrated use of biological sources in a task-oriented...
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