Logical Models
A logical data
model or logical schema is a data
model of a specific problem domain expressed independently of a particular database management product or storage technology (physical data model) but in terms of data structures such as relational tables and columns, object-oriented classes, or XML tags. This is as opposed to a conceptual data model, which describes the semantics of an organization without reference to technology.Logical data models represent the abstract structure of a domain of information. They are often diagrammatic in nature and are most typically used in
business processes that seek to capture things of importance to an organization and how they relate to one another. Once validated and approved, the logical data
model can become the basis of a physical data
model and form the design of a database.Logical data models should be based on the structures identified in a preceding conceptual data model, since this describes the semantics of the
information context, which the logical
model should also reflect. Even so, since the logical data
model anticipates implementation on a specific computing system, the content of the logical data
model is adjusted to achieve certain efficiencies.The term 'Logical Data Model' is sometimes used as a synonym of 'domain model' or as an alternative to the domain model.
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