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The new edition of the classic bestseller that launched the data warehousing industry covers new approaches and technologies, many of which have been pioneered by Inmon himself In addition to explaining the fundamentals of data warehouse systems, the book covers new topics such as methods for handling unstructured data in a data warehouse and storing data across multiple storage media Discusses the pros and c*** of relational versus multidimensional design and how to measure return on investment in planning data warehouse projects Covers advanced topics, including data monitoring and testing Although the book includes an extra 100 pages worth of valuable content, the price has actually been reduced from $65 to $55

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集成和性能并不是仅有的两个使得简单的抽取过程无法用于构造数据仓库的主要问题

如图3-10所示高层建模以实体和关系为特征

这样关系的传递依赖数目最小化

物理数据模型是从中间层数据模型创建而来的，建立物理模型通过扩展中间层模型，使模型中包含有关键字和物理特性。

操作型环境与数据仓库环境的不同与任何两个环境可能的不同是一样的

在选择适当粒度级别的过程中需要进行的权衡将围绕管理大量的数据和存储尽可能高粒度级别上的数据来进行

书籍介绍

The new edition of the classic bestseller that launched the data warehousing industry covers new approaches and technologies, many of which have been pioneered by Inmon himself In addition to explaining the fundamentals of data warehouse systems, the book covers new topics such as methods for handling unstructured data in a data warehouse and storing data across multiple storage media Discusses the pros and c*** of relational versus multidimensional design and how to measure return on investment in planning data warehouse projects Covers advanced topics, including data monitoring and testing Although the book includes an extra 100 pages worth of valuable content, the price has actually been reduced from $65 to $55