PDF Ita - Access
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COSA E’ UN DATA-BASE (DB) ? è l’insieme di dati relativo ad un sistema informativo COSA CARATTERIZZA UN DB ? la struttura dei dati le relazioni fra i dati I REQUISITI DI UN DB SONO: la ridondanza minima i dati non devono essere inutilmente duplicati per problemi di: - spazio, - gestione, - manutenzion e, - affidabilità, - coerenza la permanenza dei dati la base di dati è protetta contro eventi che possano minacciarne l’esistenza e/o l’integrità la condivisione dei dati piu’ utenti devono potere ad un tempo usare la stessa base di dati (supporto unico, aggiornamento unico, coerenza dei dati, affidabilità, ...) Schema di una base di dati Descrizione della struttura dei dati di uno specifico contesto applicativo Istanza (o occorrenza) di una base di dati Valore assunto dai dati di un certo DB in un certo istante Organizzazione degli archivi Le informazioni contenute in memoria vengono organizzate in record logici
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