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mainframe computer for efficient analysis by marketing analysts and product supply chain managers.The September 11, 2001, terrorist attacks and the current relatively high level of natural disasters such as Hurricane Katrina sparked manycompanies to distribute their workers, operations, and systems much more widely, a reversal of the previous trend toward centralization.The goal is to minimize the consequences of a catastrophic event at one location while ensuring uninterrupted systems availability.Users can share data through file server computing, which allows authorized users to download entire files from certain computersdesignated as file servers. After downloading data to a local computer, a user can analyze, manipulate, format, and display data from the file(see Figure 6.8).The file server sends the user the entire file that contains the data requested. The user can then analyze, manipulate, format,and display the downloaded data with a program that runs on the user's personal computer.
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Chapter 13 / Exercise 6
Systems Architecture
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5/19/11 1:23 AMPrint ChapterPage 22 of 61…menubar=0,directories=0,location=0,status=0,scrollbars=1,resizable=06-2cClient/Server SystemsFigure 6.9. Client/Server ConnectionTable 6.3. Advantages and Disadvantages of Client/Server ArchitectureAdvantagesDisadvantagesMoving applications from mainframecomputers and terminal-to-host architectureto client/server architecture can yieldsignificant savings in hardware and softwaresupport costs.Moving to client/server architectureis a major two- to five-yearconversion process.Minimizes traffic on the network becauseonly the data needed to satisfy a user queryis moved from the database to the clientdevice.Controlling the client/serverenvironment to prevent unauthorizeduse, invasion of privacy, and virusesis difficult.Inclient/serverarchitecture, multiple computer platforms are dedicated to special functions such as database management, printing,communications, and program execution. These platforms are calledservers. Each server is accessible by all computers on the network.Servers can be computers of all sizes; they store both application programs and data files and are equipped with operating system softwareto manage the activities of the network. The server distributes programs and data to the other computers (clients) on the network as theyrequest them. An application server holds the programs and data files for a particular application, such as an inventory database. The clientor the server can do the processing.A client is any computer (often a user's personal computer) that sends messages requesting services from the servers on the network. Aclient can converse with many servers concurrently. For example, a user at a personal computer initiates a request to extract data thatresides in a database somewhere on the network. A data request server intercepts the request and determines on which database server thedata resides. The server then formats the user's request into a message that the database server will understand. When it receives the

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Term
Spring
Professor
B.HOMAN
Tags
Wi Fi, WiMAX, Print Chapter, telecommunications system
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Systems Architecture
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Chapter 13 / Exercise 6
Systems Architecture
Burd
Expert Verified

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