Data Model is a logical map that represents the inherent properties of the data independent of software hardware or machine performance considerations. The model shows data elements grouped into records as well as the association around those records. Since the data model is the basis for data implementation regardless of software or hardware platforms...
Data Modeling is a method used to define and analyze data requirements needed to support the business functions of an enterprise. These data requirements are recorded as a conceptual data model with associated data definitions. Data modeling defines the relationships between data elements and structures. Data modeling can be used for a wide array of...
This data model represents events entities and objects in the real world that are of interest to the company. It is subject oriented and includes all aspects of the real world primarily activities pertaining to the business. To use lay terms a data model can be considered a road map to get one employee from point A to point B in the least mileage...
Common Data Modeling is defining the unifying the structure used in allowing heterogeneous business environments to interoperate. A Common Data Model is very critical to a business organization. Especially with today s business environment where it is common to have multiple applications a Common Data Model seamless integrates seemingly unrelated...
Common Data Modeling is one of the core considerations when setting up a business data warehouse. Any serious company wanting to have a data warehouse will have to be first serious about data models. Building a data model takes time and it is not unusual for companies to spend two to five years just doing it. Data Models should reflect practical...
Entity-Relationship The Entity-Relationship or E-R is a model which deals with real world entities it includes a set of objects and the relationships among them. Entity is an object that exists and is easily distinguishable from others. Like people they can easily be distinguished from others through various methods; for instance you can distinguish...
What is a Concept Oriented Model Concept-oriented model is proclaimed to be the next level in data modeling. The method is based upon the assumption that data aspects are living concepts where each is a combination of a number of super-concepts. The belief goes on to complement the top concept and the bottom concept structures. This particular...
What is the Object-Relational Model The object-relational model is designed to provide a relational database management that allows developers to integrate databases with their data types and methods. It is essentially a relational model that allows users to integrate object-oriented features into it. This design is most recently shown in the...
What is the Object Model The Object model also referred to as the object oriented model was designed to add database functionality to object programming languages. Object models help to extend the semantics of C which are Smalltalk and Java object programming languages used to provide full-featured database programming capability all the...
What is the Associative Data Model The Associative data model is a model for databases unlike any of those we spoke of in prior articles. Unlike the relational model which is record based and deals with entities and attributes this model works with entities that have a discreet independent existence and their relationships are modeled as associations. The...
What is a Hierarchical Model The term Hierarchical Model  covers a broad concept spectrum. It often refers to a lot of set ups like Multi-Level models where there are various levels of information or data all related be some larger form. The Hierarchical model is similar to the Network model; it displays a collection of records in trees rather...
What is a Multi-dimensional Model Multi-dimensional  model is an integral aspect of the On-line Analytical Processing which  also  known as OLAP. Due to the fact that OLAP is online it provides information quickly iterative queries are often posed during interactive sessions. Due to the analytical nature of OLAP the queries are often...
What is a Network Model Oddly enough the Network model was designed to do what the Hierarchical model could not. Though both show how data is related the Network model allows for data to not only have many children but also many parents where as the Hierarchical model allowed for only one parent with many children. With the Network model data relationships...
What is a Relational Model The Relational Model is a clean and simple model that uses the concept of a relation using a table rather then a graph or shapes. The information is put into a grid like structure that consists of columns running up and down and rows that run from left to right this is where information can be categorized and sorted. The...
What is the Semi-Structured Data Model The semi-structured data model is a data model where the information that would normal be connected to a schema is instead contained within the data this is often referred to as self describing model. With this type of database there is no clear separation between the data and the schema also the level...
What is the Star Schema The Star Schema is basically the simplest form of a data warehouse. This schema is made up of fact tables and dimension table. We have covered dimension tables in previous articles but the concept of fact tables is fairly new. A fact table contains measurable or factual data about an organization. The information contained...
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. The XML database is a Meta markup language that was developed by W3C to handle the inadequacies of HTML. The HTML language began to evolve quickly as...
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 Schema. This is a data model that is often used in instances where the amount of attributes properties or parameters that can be used to define an entity are potentially limitless...
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 interrelationships between entities and attributes in the database.  It represents the arrangement and relationship of data entities for the logical data...
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 warehouse or any general information system implementation.  It is a chart that depicts the structure and existence of data attributes and data entities...
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 structure data so it can seamlessly integrates with any information system that needs it. It also means that data needs to integrate with the business schema...
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 advantaged of the in the implementation of a service oriented business processes integration. It helps to resolve problems with 3-schema...
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 the actual implementation of a conceptual module in a database. It represents normalized design of common data model which is required to support the...
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 sources stored processed or accessed physically. Enterprise Data Model gives overall picture of an industry perspective by offering an integrated blueprint...
The star schema which is sometimes called a star join schema is one of the most simple styles of a data warehouse schema. It consists of a few fact tables that reference any number of dimension tables. The facts tables hold the main data with the typically smaller dimension tables describing each individual value of a dimension. Star Schema is...
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 derive a physical model and work further back to a logical model in the case of data modeling. Because of the some of the nuances associated with different...
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 for exploring domain concepts in an enterprise with stakeholders of the project. The logical model is used for exploring the domain concepts as well...

 

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