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Index pour les bd

Trois méthodes d'organisation de fichier Heap, Indexed Sequential Access Method(ISAM), Hash
Décrire le Heap Désordonnée, Insertion rapide, Recherche longue
Décrire Indexed Sequential Access Method(ISAM) Données classées séquentiellement, Recherche binaire possible
Décrire le Hash Calcul de hashage, champ ou clé de hashage, apparence aléatoire
Type d'index(3) Primaire, De cluster, Secondaire
Décrire index primaire Les clés sont crées automatiquement par oracle
Décrire index de cluster Les clés alternatives sont utilisés
Décrire index secondaire Les attributs sont utilisés
Comment choisir un index(2 approches) -Garder les tuples désordonnés(heap) et créer des index secondaires -Ordonner les tuples index primaire ou cluster et prendre l'attribut le plus utilisé pour la jointure.
Rendu à la page 7
Created by: Gabswim