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Three-Tier

Webopedia Staff
Webopedia Staff
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A 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).

2. The functional modules that actually process data. This middle tier runs on a server and is often called the application server.

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:

  • The added modularity makes it easier to modify or replace one tier without affecting the other tiers.
  • Separating the application functions from the database functions makes it easier to implement load balancing.

    • Webopedia Staff
    Webopedia Staff
    Since 1995, more than 100 tech experts and researchers have kept Webopedia’s definitions, articles, and study guides up to date. For more information on current editorial staff, please visit our About page.

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