April 2025
Intermediate to advanced
340 pages
10h 31m
Italian
Content preview from Fondamenti dei sistemi scalabili
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Capitolo 13. Implementazioni di database distribuiti
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Nei tre capitoli precedenti ho descritto i vari principi e le architetture dei sistemi distribuiti che sono ampiamente utilizzati nei database distribuiti scalabili. Questi principi consentono di suddividere e replicare i dati su più nodi di archiviazione e di supportare diversi modelli di coerenza e disponibilità per gli oggetti di dati replicati.
Il modo in cui i database specifici si basano su questi principi dipende in larga misura dai database. I diversi fornitori di database scelgono tra approcci ben conosciuti, oltre a progettare meccanismi proprietari, per implementare gli attributi di qualità dell'architettura del software che desiderano promuovere nei loro prodotti. Ciò significa che database superficialmente simili nelle loro architetture e caratteristiche si comporteranno probabilmente in modo molto diverso. Anche le implementazioni della stessa funzione, ad esempio le elezioni primarie, possono variare in modo significativo in termini di prestazioni e robustezza tra i vari database.
Valutare una tecnologia di database per un caso d'uso specifico richiede quindi conoscenza e diligenza. Devi capire in che modo l'architettura di base e il modello di dati di una tecnologia candidata corrispondono alle tue esigenze in termini di scalabilità, disponibilità, coerenza e, naturalmente, ...
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