Labels:text | map | diagram OCR: PHP HEADQUARTERS TYPICAL PHP SALES OFFICE Seattle Thin Client Chicoge & New York. server. visuprom' emailatt Son Server, 2 Sippers Otip hjlos Alegales San Diego. HipHip Headquarters TIER 2 TIERN TIER 3 Thiene cent FIGURE 1: Three-tier architecture, or, multitier architecture refers to the application logic and how it is partitioned. # TIER 1: The user Interface or presentation layer is referred to as the first tier and, in PHP's proposed solution, consists of the Web browser, which may be running on o desk- top computer, a mobile or laptop computer, or a network computer. SW TIER 2: The second or middle tier is typically the application code, running as a service. In this figure, the Web service and the application services, including Oracle Developer Server-based Oracle Financials and Human Resources Applications, comprise the second tier of the applications. UN TIER 3: The third tier is the data, which may be running on the same physical hard- ware as the second tier, In this example, the Oracle8 database is installed and running on Server 2, along with Oracle, Application Server and the Web server, In another envi- ronment, one or more database instances could be running on different hardware, depending on the specifics of the application.
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