By John Poole, Dan Chang, Douglas Tolbert, David Mellor
* Written by means of the authors of the typical Warehouse Metamodel (CWM) specification, this ebook is the reputable and authoritative developer's consultant * presents a accomplished examine the right way to strengthen database and knowledge warehouse functions utilizing the typical Warehouse Metamodel * Covers the complete improvement lifecycle together with software layout, * implementation, and deployment * spouse website comprises updates at the expertise, descriptions of instruments, and hyperlinks to seller websites
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Emphasis is placed on the specification and resolution of logical concepts to their underlying, physical realization. Then covers the development of an alternative logical-tophysical mapping, in which the same logical dimensional model is deployed on top of another underlying resource model. Emphasis is placed on how the physical model is modified to provide various optimizations while the logical model is preserved. Finally, the dimensional model is extended via extension of the core dimensional model to provide additional, specialized meta data structures to handle tool-specific meta data.
Otherwise, we could build models that are nonsensical. Given all of these considerations, it is now easy to see why meta data is essentially a formal model of its data. Meta data is an abstract description of data that describes data precisely. Meta data must also be formulated according to certain rules ensuring that it is correctly formed. This guarantees that any software product aware of the meta data description rules will always be able to correctly interpret meta data when performing operations on the corresponding data.
However, at the higher, more abstract Analysis and Management layers, superclasses are not shown. This has been done to simplify the diagrams at the higher layers because packages in higher layers tend to have more classes than those at lower layers. The absence of superclasses in the diagrams at these layers makes them simpler to understand because the number of classes is reduced. The complete set of superclasses for the Analysis and Management layers can be found in the CWM specification. Also, after discussing the first three layers, we will take a break from package descriptions for a while to explore how the CWM accomplishes three important tasks.
Common Warehouse Metamodel Developer's Guide by John Poole, Dan Chang, Douglas Tolbert, David Mellor