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mainbd1's Introduction

Appunti di Basi Dati modulo 1.

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Programma

Il modello relazionale

  • Concetti di base: dominio, attributo, relazione, n-upla, schema.
  • I linguaggi di interrogazione (algebra relazionale, linguaggi relazionalmente completi).

Teoria della normalizzazione

  • Dipendenze funzionali.

  • Chiave di una relazione

  • Terza forma normale.

  • Assiomi di Armstrong e chiusura di un insieme di dipendenze.

  • Chiusura di un insieme di attributi.

  • Copertura minimale di un insieme di dipendenze.

  • Scomposizioni che hanno un join senza perdita.

  • Scomposizioni che preservano le dipendenze.

L’organizzazione fisica dei dati

  • La memoria secondaria.

  • Record fisici e record logici.

  • Puntatori.

  • Blocchi.

  • File heap.

  • File hash.

  • File con indice (indici densi e indici sparsi).

  • B-tree

  • Dati “sporchi”.

  • Rollback a cascata.

  • Timestamp.

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