By Rebecca M. Riordan
World-renowned specialist Rebecca M. Riordan has written the definitive database layout e-book for operating builders who are not database specialists. regardless of how messy or complicated your corporation problem, Designing powerful Database structures exhibits you the way to layout a good, high-performance database to resolve it.Riordan starts off through completely demystifying the foundations of relational layout, making them available to each expert developer. subsequent, she bargains the field's clearest creation to dimensional database modeling: sensible perception for designing modern day more and more vital analytical functions. One activity at a time, Riordan illuminates each part of database research and layout for either OLAP and OLTP, exhibiting how you can steer clear of universal architectural pitfalls that complicate improvement and decrease extensibility. The ebook concludes with complete, specialist information on designing databases for optimum usability.
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Additional resources for Designing effective database systems
To see some of the benefits of sub-classing entities, let's first look at a more traditional implementation. In the Microsoft Access Northwind sample database, each product is assigned to a product category, as shown in Figure 3-9. Figure 3-9. Each Product in the Northwind Database Is Assigned to a Product Category Having a Categories relation allows the products to be grouped for reporting purposes and might be all that is required by your problem space. But with this design, you can treat a product only as a product, not as an instance of its specific category.
I'd be willing to bet that you'll discover during initial data entry that at least one manager has six direct reports. What happens then? Will somebody suddenly have a new boss? Will the manager get entered (and maybe paid) twice? Or will the programmer who implemented your design, and then got a support call at 3. , say some very uncharitable things about you? Limitations on cardinality such as these must be implemented as system constraints; they shouldn't be embedded in the structure of the relations themselves.
Where they can't, your only resource is to build the database system in such a way as to ensure the integrity of the multi-relation join. Summary In this chapter, we've examined the structure of databases in terms of the normalization process. The basic principle underlying normalization is the elimination of redundancy by way of lossless decompositionthe ability to split relations apart without losing information. This principle is formalized in the concept of normal forms. " The remaining three normal forms are used only in exceptional cases.