Denormalization can improve performance from "summary" of SQL and Relational Theory by C. Date
Denormalization, as we've seen, involves deliberately violating the rules of normalization in order to achieve certain objectives. One of those objectives is often improved performance. But how can denormalization help in this way? The basic idea is this: If we denormalize, we reduce the number of joins that need to be performed, and joins are typically expensive operations in terms of time and resources. So, all other things being equal, if we denormalize, we may well speed up some queries. The key point here is that denormalization can be a trade-off. We sacrifice the benefits of normalization in order to achieve certain other objectives - such as improved performance. And, as always with trade-offs, we have to be careful. We have to weigh the advantages of denormalization against the disadvantages - and make sure...
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