THREE-TIER ARCHITECTURES, ADVANTAGES

• Commonly cited advantages include:

  • RPC calls from the presentation client to the middle tier provide greater generality (i.e. flexibility) than the SQL calls usually used in the 2-tier architecture.
  • The 3-tier clients do not have to understand SQL. This allows the organization, names, or even the overall structure of back end data to changes without requiring changes in the PC-based presentation clients. This allows clients to access even non-relational databases and greatly simplifies introduction of new database technologies.

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