week 1 -- Lesson 1.pptx_week 1 -- Lesson 1.pptx

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1. Bases de Données Réparties Leçon 1: Introduction Mooc BDR

2. Introduction

3. Les Bases de données Données SGBD

4. Les Bases de données Données SGBD Administrateurs de BD Concepteurs de BD Utilitaires de BD

5. Les Bases de données Données SGBD Applications et programmes Administrateurs de BD Concepteurs de BD Utilisateurs finaux Programmeurs d’application Utilitaires de BD Développement Utilisation

6. Les BD relationnelle s BD relationnelle = ensemble de tables appelés relations . Ces tables sont reliées les unes aux autres à l’aide de clés étrangères.

7. Les BD relationnelle s BD relationnelle = ensemble de tables appelés relations . Ces tables sont reliées les unes aux autres à l’aide de clés étrangères.

8. Les BD relationnelle s BD relationnelle = ensemble de tables appelés relations . Ces tables sont reliées les unes aux autres à l’aide de clés étrangères.

9. Bases de données centralisées

10. Limites des BD centralisées Répartition des SI sur plusieurs sites, pays, continents BD centralisée problèmes de disponibilité des données et de performance d’exécution des requêtes.

11. Bases de données réparties (BDR)

12. Bases de données réparties (BDR) Une base de données répartie données sur plusieurs ordinateurs traitements locaux Un SGBD réparti = SGBD d’une BDR R épartition des données et des traitements transparente aux utilisateurs

13. Ce n’est pas une BDR N’est pas une BDR si seules les données sont réparties et pas les traitements Cas de Microsoft Access qui peut «  attacher  » des tables ou fichiers répartis sur plusieurs ordinateurs.

14. Conclusion