April 2025
Intermediate to advanced
432 pages
13h 18m
Italian
book
Cassandra: The Definitive Guide, (Revised) Third Edition, 3a edizione
by Jeff Carpenter, Eben Hewitt
Content preview from Cassandra: The Definitive Guide, (Revised) Third Edition, 3a edizione
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Capitolo 4. Il linguaggio di query di Cassandra
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In questo capitolo, imparerai a conoscere il modello di dati di Cassandra e il modo in cui questo modello di dati viene implementato dal Cassandra Query Language (CQL). Mostreremo come il CQL supporta gli obiettivi di progettazione di Cassandra e vedremo alcune caratteristiche generali di comportamento .
Per gli sviluppatori e gli amministratori che provengono dal mondo relazionale, il modello di dati di Cassandra può essere inizialmente difficile da comprendere. Alcuni termini, come keyspace, sono completamente nuovi e altri, come column, esistono in entrambi i mondi ma hanno significati leggermente diversi. La sintassi di CQL è per molti versi simile a quella di SQL, ma con alcune importanti differenze. Per chi ha familiarità con le tecnologie NoSQL come Dynamo o Bigtable, può anche creare confusione, perché sebbene Cassandra si basi su queste tecnologie, il suo modello di dati è significativamente diverso.
In questo capitolo, quindi, partiamo dalla terminologia dei database relazionali e introduciamo la visione del mondo di Cassandra. Lungo il percorso prenderai confidenza con CQL e imparerai come implementa questo modello di dati.
Il modello di dati relazionale
In un database relazionale, il database stesso è il contenitore più esterno che potrebbe corrispondere a una singola applicazione. ...
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