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Chapter 18. Database Integrity > Implementing Constraints and Rules

Implementing Constraints and Rules

Having looked at the various types of integrity constraints and rules that determine whether data is valid (and it's important to remember here that valid means “possible,” not “correct”), we can now turn to how to implement them in such a way as to make things easiest for the user.

The Implementation Tier

The first issue to address is precisely where the rules ought to be implemented. In recent years, much attention has been given to multi-tiered application architectures, which divide the application into multiple logical and physical tiers, each responsible for a different type of processing. The first version of this tiered architecture was, of course, the two-tier client-server applications, which separated database processing from everything else.


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