By Antonio Corral, Joaquin Cañadas, Michael Vassilakopoulos (auth.), Yannis Manolopoulos, Skevos Evripidou, Antonis C. Kakas (eds.)
This e-book constitutes the completely refereed post-proceedings of the eighth Panhellenic convention on Informatics, PCI 2001, held in Nicosia, Cyprus in November 2001.
The 31 revised complete papers offered have been conscientiously chosen and stronger in the course of months of reviewing from 104 convention papers. The papers hide the components of databases, info mining and clever structures, e-learning, human machine interplay, photograph processing, networks and platforms, software program and languages, and theoretical desktop science.
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Extra info for Advances in Informatics: 8th Panhellenic Conference on Informatics, PCI 2001 Nicosia, Cyprus, November 8–10, 2001 Revised Selected Papers
We believe that there is a number of crucial requirements particular to OLAP cubes, that should be the main focus of physical schema design. , by precomputing and materializing their result. Ad-hoc star queries represent the majority of OLAP queries, since they capture the essense of true “on-line analysis”. Eﬃcient Navigation in the Multi-Level Multidimensional Space: User queries are deﬁned in terms of dimensions and hierarchy levels, therefore the underlying physical organization must provide “access paths” to the data that are “hierarchy aware” and enable fast access to data through all kind of combinations of diﬀerent hierarchy levels.
We will brieﬂy discuss this plan here. Essentially, the evaluation of a star query is a 3-step process: Identify and Retrieve Fact Table Data: The processing begins with the evaluation of the restrictions on the individual dimension tables. This step performed on a hierarchically encoded dimension table will result in a set of h-surrogates that will be used in order to access the corresponding fact table data. Due to the hierarchical nature of the h-surrogate this set can be represented by a number of h-surrogate intervals called the h-surrogate specification.
Due to the hierarchical nature of the h-surrogate this set can be represented by a number of h-surrogate intervals called the h-surrogate specification. Using the notation of , an interval can for example have the form v3 /v2 /∗, where v3 , v2 are speciﬁc values of the h3 and h2 hierarchical attributes of the dimension in question. The symbol “∗“ means all the values of the h1 attribute in the dimension tuples that have h3 = v3 and h2 = v2 . In the case of a DATE dimension, the h-surrogate speciﬁcation could be 1999/January/∗ to allow for any day in this month.
Advances in Informatics: 8th Panhellenic Conference on Informatics, PCI 2001 Nicosia, Cyprus, November 8–10, 2001 Revised Selected Papers by Antonio Corral, Joaquin Cañadas, Michael Vassilakopoulos (auth.), Yannis Manolopoulos, Skevos Evripidou, Antonis C. Kakas (eds.)