Le Data Warehouse et les Systèmes. Multidimensionnels Définition d'un Datawarehouse (DW). • Le Datawarehouse est une collection de données.
d'où la naissance du concept. Entrepôt de Données = Data Warehouse. Les DWH sont physiquement séparés des SGBD opérationnels (BD opérationnelles). 11/69
caractéristiques data warehouse data mart utilisateur toute l'entreprise un département. BD. SQL type serveur BD MD OLAP.
30 janv. 2017 Datawarehouse. Le terme entrepôt de données (ou base de données décisionnelle ou encore data warehouse) désigne une.
Définition d'un Data warehouse (DW). • Le Data warehouse (entrepôt de données) est une collection de données orientées sujet intégrées
13 déc. 2011 •Une méthode alternative : Data Vault. Kimball. Inmon. Processus. Bottom-Up. Top-Down. Organisation. Datamarts. Datawarehouse.
Data Warehouse Architecture A data warehouse system has two main architectures: the data flow architecture and the system architecture The data flow architecture is about how the data stores are arranged within a data warehouse and how the data flows from the source systems to the users through these data stores
“A data warehouse is a subject-oriented integrated time- variant and nonvolatile collection of data in support of management’s decision-making process ”—W H Inmon Operational Data: Data used in day-to-day needs of company Informational Data: Supports other functions such as planning and forecasting
Data Warehousing • Solution: new analysis environment (DW) where data are Subject oriented (versus function oriented) Integrated (logically and physically) Time variant (data can always be related to time) Stable (data not deleted several versions) Supporting management decisions (different organization)
setting up the data warehouse enterprises had to hire a team of database administrators to keep their queries running fast and protect against data loss Traditional data warehouse architectures and on-premises data warehousing pose many challenges: • They are difficult to scale and have long lead times for hardware procurement and upgrades