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Database Guru (and currently a vice-president of Core Technologies at Oracle Corporation) Tom Kyte,[20] for example, correctly points out drawbacks of employing EAV in traditional business scenarios, and makes the point that mere "flexibility" is not a sufficient criterion for employing EAV. (However, he makes the sweeping claim that EAV should be avoided in all circumstances, even though Oracle's Health Sciences division itself employs EAV to model clinical-data attributes in its commercial systems ClinTrial[21] and Oracle Clinical.[22]).
wikipedia.org: Entity–attribute–value model