HRM 3450 Chapter Notes - Chapter 7: Common Gateway Interface, Database Server, Web Server
5 May 2018
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HRM 3450 Chapter 7 Notes – Summary
Introduction
• The Web server in a large Internet-based business may have to respond to thousands of
requests simultaneously.
• Because response time is considered an important measure by most Web users, it is
often more practical to separate the database and page processing into a third
computer system.
• The result is called three-tier architecture.
• Note that, in this case, the Web server machine is a client to the database application
and database server on the third computer.
• CGI, the Common Gateway Interface, is a protocol for making communication between
the Web server and the database application possible.
• We have placed the page creation application software on the database machine, but it
could be located on the Web server instead if doing so would balance the loads on the
two machines better.
• In some situations, it is even desirable to extend this idea further.
• Within reason, separating different applications and processing can result in better
overall control, can simplify system upgrades, and can minimize scalability issues.
• The most general case is known as n-tier architecture.
• Client-server architecture is a distributed processing methodology, in which some of the
processing is performed on the client system and some is performed on the server
system.
• To see this more clearly, consider the distribution of processing between the client and
server in a database application, in which the client requests specific information from a
database stored on a database server.
• At one extreme, the client application provides little more than a request form and a
means to display the results.
• All of the processing is performed on the server.
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