Download Data Warehousing and Knowledge Discovery: 16th International by Ladjel Bellatreche, Mukesh K. Mohania PDF

By Ladjel Bellatreche, Mukesh K. Mohania

This publication constitutes the refereed complaints of the sixteenth overseas convention on info Warehousing and information Discovery, DaWaK 2014 held in Munich, Germany, September 2014, together with DEXA 2014. The 34 revised complete papers and eight brief papers awarded have been conscientiously reviewed and chosen from 109 submissions. The papers are prepared in topical sections on modeling and ETL; ontology-based information warehouses; complicated information warehouses and OLAP; uncertainty; personal tastes and suggestion; question functionality and HPC; dice & OLAP; optimization; type; social networks and suggestion structures; wisdom facts discovery; commercial purposes; mining and processing info flow; mining and similarity.

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Wrembel Definition 2 (Multidimensional instance). Multidimensional instance I is composed of dimension instance and fact instance. An instance of dimension Di ∈ D is as follows: For each level Lj ∈ Di , the set of members MLj = {m1 , . . , mn } where member mk ∈ MLj , k = 1, . . , n, is uniquely identifiable. Level All has a special member all. For each Lj ∈ Di with schema Lj (A1 : T1 , . . , An : Tn ), a subset of MLj × T1 × . . × Tn . For each pair of L level names Lp , Lq in R ∈ Di , a partial function Roll upLqp from MLp to MLq .

Similarly, adaptability positively affects usability, since an easily configured system is easier to use and does not require specialized skill-set from the end user. On the other hand, adaptability can be achieved with more complex systems and therefore it negatively affects manageability. This negative relationship might appear counter-intuitive, but it should be noted that our view of adaptability does not refer to autonomic behaviour, which would possibly provide self-management capabilities.

Thus, improved Data Quality would have to be considered at the price of decreased Performance and whether or not the decision to select the second design would be optimal, would depend on the importance of each of these characteristics for the end-user. As can be seen in Fig. 3 the improvement of any other characteristic negatively affects performance. That is reasonable since such improvements would require the addition of extra complexity to the ETL process, diverging from the optimal simplicity that favours performance.

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