client server architecture. - Functional requirements in the 2-tier structures. - Functional distribution in the 2-tier structures. - Implementation of Business Logic at. Computer Science Program, The University of Texas, Dallas. Lawrence Chung. Client-Server Architecture. Clients and Servers. Client/Server with File Servers. Client Server Architecture. Submitted in partial fulfillment of the requirement for the award of degree of Bachelor of Technology in Computer Science.
|Language:||English, Spanish, Arabic|
|Distribution:||Free* [*Registration Required]|
𝗣𝗗𝗙 | Client- server is a system that performs both the functions of client and Also, the architecture of the Web is the Client-Server model. CLIENT SERVER ARCHITECTURE. Client/server describes the relationship between two computer programs in which one program, the client, makes a service. ARCHITECTURE. What is a Client Server Network? The type of computing system in which one powerful workstation serves the requests of other systems, is an.
The developer of business logic deals with a standard process logic syntax without considering the physical platform. In the case of a small network, the network administrator can usually handle the duties of maintaining the database server, controlling the user access to it, and supporting the front-end applications. However, the number of database server users rises, or as the database itself grows in size, it usually becomes necessary to hire a database administrator just to run the DBMS and support the front-ends.
It usually makes sense from the performance and data integrity aspects to have the database server running on its own dedicated machine.
This usually means downloading a high-powered platform with a large amount of RAM and hard disk space. It is also harder to pinpoint problems when the worst does occur and the system crashes. It can take longer to get everything set up and working in the first place.
This is compounded by the general lack of experience and expertise of potential support personnel and programmers, due to the relative newness of the technology. Making a change to the structure of database also has a ripple effect throughout the different front-ends.
As in the case of X-Windows graphical user interface, the implementation comprises both client and server components that may run on the same and different physical computers. Client server is modular infrastructure, this is intended to improve Usability, Flexibility, Interoperability and Scalability. Explain each with an example, in each case how it helps to improve the functionality of client server architecture. Explain the following. Describe atleast two advantages and disadvantages for each architecture.
Explain with a sketch. Differentiate between Stateful and Stateless servers. Describe three-level schema architecture. Why do we need mapping between schema levels? Differentiate between Transaction server and Data server system with example. In client server architecture, what do you mean by Availability, Reliability, Serviceability and Security? Explain with examples.
In the online transaction processing environment, discuss how transaction processing monitor controls data transfer between client and server machines.
Data access requirements have given rise to an environment in which computers work together to form a system, often called distributed computing, cooperative computing, and the like. To be competitive in a global economy, organizations in developed economies must employ technology to gain the efficiency necessary to offset their higher labour costs.
Re-engineering the business process to provide information and decision-making support at points of customer contact reduces the need for layers of decision-making management, improves responsiveness, and enhance customer service. Empowerment means that knowledge and responsibility are available to the employee at the point of customer contact.
Empowerment will ensure that product and services problems and opportunities are identified and centralized. For example, to remain competitive in a global business environment, businesses are increasingly dependent on the Web to conduct their marketing and service operations.
Such Web-based electronic commerce, known as E-commerce, is very likely to become the business norm for businesses of all sizes. Some of them are: i The changing business environment. The effective factors that govern the driving forces are given below: The changing business environment: Business process engineering has become necessary for competitiveness in the market which is forcing organizations to find new ways to manage their business, despite fewer personnel, more outsourcing, a market driven orientation, and rapid product obsolescence.
Due to globalization of business, the organizations have to meet global competitive pressure by streamlining their operations and by providing an ever-expanding array of customer services.
Information management has become a critical issue in this competitive environment; marketing fast, efficient, and widespread data access has become the key to survival. Unfortunately, the demand for a more accessible database is not well-served by traditional methods and platforms. The dynamic information driven corporate worlds of today require data to be available to decision makers on time and in an appropriate format.
One might be tempted to urge that microcomputer networks constitute a sufficient answer to the challenge of dynamic data access. Globalization Conceptually, the world has begun to be treated as a market. Information Technology plays an important role in bringing all the trade on a single platform by eliminating the barriers.
IT helps and supports various marketing priorities like quality, cost, product differentiation and services. The growing need for enterprise data access: One of the major MIS functions is to provide quick and accurate data access for decision- making at many organizational levels. Managers and decision makers need fast on-demand data access through easy-to-use interfaces. When corporations grow, and especially when they grow by merging with other corporations, it is common to find a mixture of disparate data sources in their systems.
For example, data may be located in flat files, in hierarchical or network databases or in relational databases. Given such a multiple source data environment, MIS department managers often find it difficult to provide tools for integrating and aggregating data for decision-making purposes, thus limiting the use of data as a company asset.
Client server computing makes it possible to mix and match data as well as hardware.
The demand for end user productivity gains based on the efficient use of data resources: The growth of personal computers is a direct result of the productivity gains experienced by end-users at all business levels. End user demand for better ad hoc data access and data manipulation, better user interface, and better computer integration helped the PC gain corporate acceptance. With sophisticated yet easy to use PCs and application software, end user focus changed from how to access the data to how to manipulate the data to obtain information that leads to competitive advantages.
PC application cost, including acquisition, installation, training, and use, are usually lower than those of similar minicomputer and mainframe applications. New PC-based software makes use of very sophisticated technologies, such as object orientation, messaging, and tele-communications. These new technologies make end users more productive by enabling them to perform very sophisticated tasks easily, quickly, and efficiently. The growing software sophistication even makes it possible to migrate many mission-critical applications to PCs.
By abstracting access, it facilitates cross-platform data exchange. A computer can only perform a limited number of tasks at any moment, and relies on a scheduling system to prioritize incoming requests from clients to accommodate them. To prevent abuse and maximize availability , server software may limit the availability to clients. Denial of service attacks are designed to exploit a server's obligation to process requests by overloading it with excessive request rates.
Example[ edit ] When a bank customer accesses online banking services with a web browser the client , the client initiates a request to the bank's web server.
The customer's login credentials may be stored in a database , and the web server accesses the database server as a client. An application server interprets the returned data by applying the bank's business logic , and provides the output to the web server.
Finally, the web server returns the result to the client web browser for display. In each step of this sequence of client—server message exchanges, a computer processes a request and returns data.
This is the request-response messaging pattern. When all the requests are met, the sequence is complete and the web browser presents the data to the customer. One context in which researchers used these terms was in the design of a computer network programming language called Decode-Encode Language DEL.
Another DEL-capable computer, the server-host, received the packets, decoded them, and returned formatted data to the user-host. A DEL program on the user-host received the results to present to the user. This is a client—server transaction.
Client-host and server-host[ edit ] Client-host and server-host have subtly different meanings than client and server. A host is any computer connected to a network. Whereas the words server and client may refer either to a computer or to a computer program, server-host and user-host always refer to computers.
The host is a versatile, multifunction computer; clients and servers are just programs that run on a host. In the client—server model, a server is more likely to be devoted to the task of serving. The authors are careful to define the term for readers, and explain that they use it to distinguish between the user and the user's network node the client. Rather, it enables any general-purpose computer to extend its capabilities by using the shared resources of other hosts.
Centralized computing , however, specifically allocates a large amount of resources to a small number of computers. The more computation is offloaded from client-hosts to the central computers, the simpler the client-hosts can be.
In contrast, a fat client , such as a personal computer , has many resources, and does not rely on a server for essential functions.
As microcomputers decreased in price and increased in power from the s to the late s, many organizations transitioned computation from centralized servers, such as mainframes and minicomputers , to fat clients.