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Amazon Redshift est l’offre Data Warehouse dans le Cloud d’AWS, qui permet un hébergement d’un volume important de données ( jusqu’à des Pétabytes) tout en garantissant de bonnes performances pour leur interrogation.

Des services de Data Warehouse sur le Cloud assez similaires sont Azure SQL WareHouse,  Google Big Query, Snowflake (multi-Cloud).

Ils reposent tous sur une base de données orientée colonnes, avec du sharding des données et une architecture massivement parallèle pour les traitements.

Qu’est ce qu’une base de données orientée colonnes ?

Les Data Warehouse contiennent d’importants volumes de données, et les requêtes d’interrogation et de reporting sont très complexes.  Les bases de données relationnelles classiques, avec un stockage des données en mode lignes, ont vite montré des limites de performance.

Les bases de données orientées colonnes vont stocker les données par colonne, chaque valeur d’une colonne sera stockée à la suite, permettant des facilités de compression et d’indexation, une charge IO moins importante et une lecture plus rapide des données.


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