CSC UNIT II IN THE SUBJECT CLIENT SERVER COMPUTING

Overview
Overview
of
of
Client/Server Application
Client/Server Application

Agenda
Components of client/server:

The client

The server

The network
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 The client hardware is a desktop machine that
runs client software.
 The client hardware is the desktop machine that
runs client software.
 The client software formulates data requests and
passes the requests to the network software.
 The client communication software running on the
client hardware. The client network software
handlles the transmission of requests and receives
the results of the requests
Client

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 A server is the machine that runs data
management software.
 It has operating system software, data
management software and a portion of a network
software.
 When evaluating server hardware , the following
points should be kept in mind.
I. Reliability
II. Availability
III. Flexibility and scalability.
Server

 The network hardware is the cabling,the
communication cards and the devices that links
the server and clients.
 The network operating system manges the
network related input/output processes of the
server.
Network

Client/server application can be categorized
by class, based on where most of the processing is
done.
 Host-based processing
 Client-based processing
 Cooperative processing
Classes of client/server Application
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 The most basic class of client/server applications
has a presentation layer running on the desktop
machine with all the application processing
running on the server/host.
 Host/based processing applications require less
functionality on the client than the other classes of
client/server applications.
 Existing equipment(desktop micros) is used to
provide this increased productivity.
Host-Based processing

 The client-based processing class of client/server
application puts all the application logic on the
client machine, with the exception of data
validation routines, which are coded into the
DBMS on the server.
 This environment requires coordination between
the platform and the software running on the
platforms.
 Users can access data on any node.
 Many of the host functions , such as security and
reliability, must be built into these new
client/server applications.
Client based processing
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 The third class of client/server applications uses a
fully cooperative peer-to-peer processing
approach.
 The processing is performed wherever computing
resources are available.
 A single system could act as a client for other
servers for other clients.
 Data manipulation may be performed on both the
client and the server.
 client-based processing applications do some
cooperative processing because data validation,
stored procedures, and triggers may be executed
on the server.
Cooperative processing
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Client/server applications can also be
categorized by their support function.
 Office systems
 Front ends to existing systems
 Database access
 Transaction processing applications
 Investigative applications
Categories of client/server
application
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 Client/server computing provides a framework for
electronic communication.
 Businesses are trying to improve interpersonal
communications, both internally and externally.
 Many organizations are using their linked LAN’s as
a network for enterprise-wide mail systems and
workgroup applications.
 The two major LAN mail products are:
 Microsoft’s Mail 3.0
 Lotus’s cc:Mail
Office systems
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 Client/server applications consists of screen-
emulation systems, which convert existing
character based screens to GUI screens.
 The benefits of these systems are:
 Ease of use
 Increased worker productivity
Front-ends to existing systems
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 Client/server applications are being written to
provide GUI for accessing corporate data.
 The query oriented applications provide a single
window to the data of the organization.
 The benefits are:
 Ease of use
 Increased worker productivity.
Database access
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 Transaction processing applications are known as
mission critical applications , Include order entry ,
inventory and point of sale systems.
 A transaction is two or more operations performed
as a group.
 Transactions are generated at the client and sent
to the server for other servers.
 In these processing, ALL operations must be
successfully performed. If ANY operation of a
transaction cannot be completed, the operations
that have taken effect must be reversed using a
process called commit and rollback.
Transaction-processing
applications
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 Investigative applications are designed to support
decision markers and are not usually based on
real-time data.
 These applications, usually a series of queries,
provide some manipulation capabilities using SQL
functions.
 It is often called Decision Support System(DSS) or
Executive Information Systems(EIS) by the
client/server literature and the press.
Investigative applications
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CSC UNIT II IN THE SUBJECT CLIENT SERVER COMPUTING

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