2.2. Tools for Running SQL
Most Oracle database environments consist of two, three, or more tiers. In the simplest two-tier scenario, a database developer might be using SQL*Plus on a Windows PC connecting to an Oracle database on a Linux server. More complex environments may include a web server, application server, or authentication server on a number of other servers in between the client and the database server.
tiers
Locations where different components of an enterprise application system reside. In a typical three-tier environment, the client tier runs a thin application such as a web browser, which connects to a middleware server that is running a web server. The web server and its related components typically manage the business rules ...
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