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MessagePosté le: Mar 27 Sep - 17:38 (2016)    Sujet du message: Aggregation In Data Warehousing Pdf Free Répondre en citant




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Vertical Partition. If the dimension changes, then the entire fact table would have to be repartitioned. To handle user queries, it requires additional processing power and disk storage. A data warehouse is a complex system and it contains a huge volume of data. Data warehouse is dynamic; it never remains constant.

Aggregate navigator[edit]. Suppose a company wants to keep track of sales records with the help of sales data warehouse with respect to time, item, branch, and location. This way, the aggregated dimension tables should conform to the base dimension tables.[1] So the reason why aggregates can make such a dramatic increase in the performance of the data warehouse is the reduction of the number of rows to be accessed when responding to a query.[2]. The fourth approach says that to load the data in tables that already contain data, drop the indexes & recreate them when the data load is complete. These technologies help executives to use the warehouse quickly and effectively. Q: What is Summary Information? . Load Manager.

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