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ClientServer concepts - Client Server Concepts 1 Agenda...

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Client Server Concepts
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2 Copyright © 2005, Infosys Technologies Ltd ER/CORP/CRS/OS12/003 Version No: 2.0 Agenda Standalone (Single User) Host Centric (Multi User) Client/Server Network Operating System Middleware Application Layering Middleware: ODBC
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3 Copyright © 2005, Infosys Technologies Ltd ER/CORP/CRS/OS12/003 Version No: 2.0 Standalone – Single User Applications and Data reside on the same computer Dedicated for single user Powerful and economical Examples: Calculator, MS Word, etc Single user system computing is an approach that designs an application in such a way that all the applications and data reside on a single personal computer dedicated to the use of a single person. Advantages The advantages of using a stand-alone system are as follows. 1. A stand-alone system is considered to be a personal property. The user of the personal computer has a complete control of the working environment of the system. For example, if the user is not satisfied with MS-DOS operating system (OS), she can have Windows OS loaded in the system. If the person is not interested in the Windows OS then she can load Linux OS, and so on. Whatever the reason may be, the owner of the system has full authority to decide what she wants. In addition to the above-mentioned factors, third party applications are widely portable and usable in such systems. Thus, this serves as a good development environment. 2. Now a days, one can easily obtain powerful machines at a very cheap price. Disadvantages One of the major drawbacks in using stand-alone personal computers is that applications, data and resources, for example, cannot be shared.
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4 Copyright © 2005, Infosys Technologies Ltd ER/CORP/CRS/OS12/003 Version No: 2.0 Host Centric – Multi User Host Centric approach Applications and data components reside and execute on one centralized platform Multiple users access the same application on this central platform Examples: Mainframe Proprietary Technology MAINFRAME SYSTEM Terminal (Remote) Telecommunication Network Terminal (Remote) Communication Front End (Modem/Serial Port etc) Application Application Application Operating System Database Terminal (Local) Modem Host based approach : Host centric approach is an approach that design an application in such a way that both the functional and data components reside and execute on one centralized platform giving access to multiple users. Advantages of Host Based approach 1. It is capable of providing simultaneous access to a very large number of users. The number of users accessing the system range from a few hundreds to few thousands. 2. These systems are stable, reliable and well supported. 3. Mainframe systems provide a one-stop-shopping which means that all the components right from hardware, software and network are made available by one vendor.
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