2.2 Two-Tier vs. Three-Tier

• Before the web, most small-to-medium scale apps were implemented in 2 tiers

• 2-tier on a LAN

  • Connect PCs directly to transaction servers
  • Server system includes transaction server app and DBMS

• Presentation server is usually a 4GL on a PC: Visual Basic, PowerBuilder, Delphi, … (RAD = rapid app development)

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