three-tierA special type of client/server architecture consisting of three well-defined and separate processes, each running on a different platform:
1. The user interface, which runs on the user's computer (the client).
3. A database management system (DBMS) that stores the data required by the middle tier. This tier runs on a second server called the database server.
The three-tier design has many advantages over traditional two-tier or single-tier designs, the chief ones being:
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