Design data environments
The content of each data environment should be designed in detail. Design requires a close knowledge of the performance characteristics of the data environment to ensure that the non-functional constraints imposed on the data can be met. For example, while a data model in Third Plus Normal Form is considered an adequate analysis model, the data implementation in a relational database will usually be partially de-normalized to meet the performance requirements. If a non-relational database is used, then the final implementation may bear little resemblance to the logical data model; see Figure 6.3.
Figure 6.3. Example of a logical schema
In addition, capabilities such as the use of indices to support ...
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