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Concept

Database model

A database model is a type of data model that determines the logical structure of a database. It fundamentally determines in which manner data can be stored, organized and manipulated. The most popular example of a database model is the relational model, which uses a table-based format. Types Common logical data models for databases include:

Hierarchical database model :This is the oldest form of database model. It was developed by IBM for IMS (information Management System), and is a set of organized data in tree structure. DB record is a tree consisting of many groups called segments. It uses one-to-many relationships, and the data access is also predictable.
Network model
Relational model
Entity–relationship model ** Enhanced entity–relationship model
Object model
Document model
Entity–attribute–value model
Star schema

An object–relational database combines the two related structures. Physical data models include:

Inverted index

Other models inc

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Résumé

Hierarchical database model :This is the oldest form of database model. It was developed by IBM for IMS (information Management System), and is a set of organized data in tree structure. DB record is a tree consisting of many groups called segments. It uses one-to-many relationships, and the data access is also predictable.
Network model
Relational model
Entity–relationship model ** Enhanced entity–relationship model
Object model
Document model
Entity–attribute–value model
Star schema

An object–relational database combines the two related structures. Physical data models include:

Inverted index

Other models inc

Source officielle

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Concepts associés (15)

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CS-322: Introduction to database systems

This course provides a deep understanding of the concepts behind data management systems. It covers fundamental data management topics such as system architecture, data models, query processing and optimization, database design, storage organization, and transaction management.

CS-423: Distributed information systems

This course introduces the key concepts and algorithms from the areas of information retrieval, data mining and knowledge bases, which constitute the foundations of today's Web-based distributed information systems.

CS-422: Database systems

This course is intended for students who want to understand modern large-scale data analysis systems and database systems. It covers a wide range of topics and technologies, and will prepare students to be able to build such systems as well as read and understand recent research publications.

Modeling Spatial Data in the MADS Conceptual Model

Pier Donini, Christine Parent, Stefano Spaccapietra

Despite the well-established benefits of conceptual modeling for application design, current spatio-temporal conceptual models do not cope satisfactorily with designers' requirements. In this paper we first identify the goals of a spatio-temporal conceptual model and then we describe the MADS model along its structural and spatial dimensions. As the modeling concepts are orthogonal, the proposed model achieves both simplicity (as concepts are independent from each other) and expressive power (as concepts may be freely associated). The model, which includes the features of the ODMG standard model for object-oriented systems, has been implemented by translating it into operational models of existing products. Experience gained by modeling a number of applications enabled us to assess the advantages of MADS with respect to traditional entity-relationship modeling. A visual schema editor and a visual query editor are being developed

1998

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A Metamodel for the Unified Modeling Language

Andrey Naumenko, Alain Wegmann

Nowadays models, rather than code, become the key artifacts of software development. Consequently, this raises the level of requirements for modeling languages on which modeling practitioners should rely in their work. A minor inconsistency of a modeling language metamodel may cause major problems in the language applications; thus with the model driven systems development the solidness of modeling languages metamodels becomes particularly important. In its current state the UML metamodel leaves a significant area for improvement. We present an alternative metamodel that was inspired by the RM-ODP standard and that solves the problems of UML. RM-ODP was mentioned in UML specifications as a framework that has already influenced UML. Our metamodel was formalized, thus its resulting models can be simulated and checked for consistency. So, our proposed solution with constructive potential towards improvement of the UML metamodel, may have a significant practical impact on the UML specifications.

2002

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Base de données

Une base de données permet de stocker et de retrouver des données structurées, semi-structurées ou des données brutes ou de l'information, souvent en rapport avec un thème ou une activité ; celles-c

Modèle de données

En informatique, un modèle de données est un modèle qui décrit la manière dont sont représentées les données dans une organisation métier, un système d'information ou une base de données. Le terme m

Base de données orientée graphe

Une base de données orientée graphe est une base de données orientée objet utilisant la théorie des graphes, donc avec des nœuds et des arcs, permettant de représenter et stocker les données.