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Physical Data Model

There are three basic styles of data models: conceptual data model, logical data model and physical data model. The conceptual data model is sometimes called the domain model and it is typically used...

Reverse Data Modeling

Reverse data modeling is basically a form of reverse IT code engineering and it is a process wherein an IT expert tries to extract information from an existing system in order to work backward and de...

Enterprise Data Model

An Enterprise Data Model is a representation of single definition of data of an enterprise is and the representation is not biased on any system application. It independently defines how the data is ...

Logical Data Model

A logical data model is an important aspect in the design and implementation of a data warehouse in that the efficiency of the databases depends heavily on data models. Logical Data Model refers to t...

Four-Schema Concept

Four-Schema Concept   Four-Schema concept consist of a physical schema, a logical schema, a data view schema, and a business schema.   The use of the four schema concept is greatly taken ad...

External Schema

The word schema as defined in the dictionary means plan, diagram, scheme or an underlying organizational structure. Therefore, as can be very briefly said, an external schema is a plan on how to stru...

Entity Structure Chart

An entity structure chart is a visual representation of everything related to the entities related to the business rules, activities as well as the data model for the company in its database, data wa...

Entity Relation Diagram

Entity Relation Diagram which is also known as an E-R diagram is a data relation diagram.  The entity relation diagram uses specialized graphical symbols for illustrating all of the interrelatio...

Entity Attribute Value (EAV)

Entity Attribute Values What is an Entity-Attribute-Value Model (EAV)? The Entity-Attribute-Value model or EAV is also sometimes referred to at the Object-Attribute-Value Model, or even the Open Sch...

XML Database

What is an XML database? The XML database is most commonly described as a data persistence system that enables data to be accessed, exported, and imported. XML stands for Extensible Markup Language.