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Reference.org
Entity–attribute–value model
open-in-new
<p>An entity–attribute–value model (EAV) is a <a href="/facts/Data_model/j1YyzpJ3">data model</a> optimized for the space-efficient storage of sparse—or <i>ad-hoc</i>—property or data values, intended for situations where runtime usage patterns are arbitrary, subject to user variation, or otherwise unforeseeable using a fixed design. The use-case targets applications which offer a large or rich system of defined property types, which are in turn appropriate to a wide set of entities, but where typically only a small, specific selection of these are instantiated (or persisted) for a given entity. Therefore, this type of data model relates to the mathematical notion of a <a href="/facts/Sparse_matrix/FFtN0XjR">sparse matrix</a>. EAV is also known as object–attribute–value model, vertical database model, and open schema. </p>