Client Server Computing

KEY NOTES
UNIT 1 - Introduction

Introduction to Client/Server Computing

Overview of Client/Server Computing
What is Client/Server Computing

Client/server is a distributed computing model in which client applications request services from server processes and Servers receive those requests and perform actions such as database queries and reading files.

Application Tasks

User interface
Presentation logic
Application logic
Data integrity

Rightsizing

Downsizing
Upsizing
Smartsizing

Benefits of Client/Server Computing

Dollar Savings
Increased Productivity
Flexibility and Scalability
Resource Utilization
Centralized Control
Open Systems

Evolution of Client/Server Computing

Hardware Trends

Power
Chips
Memory

Software Trends

Relational Databases
GUIs
Multithreaded Processing
Continuing Evolution

Evolution of Operating Systems

Networking Trends
Business Considerations
Overview of Client/Server Applications

Components of Client/Server Applications

The Client
The Server
The Network

Classes of Client/Server Applications

Host-Based Processing
Client-Based Processing
Cooperative Processing

Categories of Client/Server Applications

Office Systems
Front-Ends to Existing Systems
Database Access
Transaction-Processing Applications

UNIT 2 - Client/Server Operating Systems

Dispelling the Myths

Client/Server Computing is Easily Implemented
Current Desktop Machines Are Sufficient
Minimal Training Is Required
All Data Are Relational
Development Time Is Shorter

Obstacles-Upfront and Hidden

Costs
Mixed Platforms
Maintenance
Reliability
Restructuring Corporate Architecture

Open Systems and Standards

Standards Areas
Existing Standards
Open Systems

Standards-Setting Organizations

Open Software Foundation
UNIX International
X/Open
Object Management Group
SQL Access Group

Factors for Success

Internetworking
Interoperability
Compatible Environments
Perceived Benefits

UNIT 3 - The Client

Client Hardware and Software
Client Components

Client Hardware
Client Software
Interface Environments

Client Operating Systems

DOS with Windows 3.x
OS/2
UNIX-Based

What is a GUI?

Screen Characteristics
Event Driven
Native API

X Window vs. Windowing

X Window GUIs
Windowing GUIs
Other Environments

Database Access

SQL Interface
Extended SQL

Application Logic

Generated Application Logic
Customized Application Logic

Client Software Products

GUI Environments

Windows 3.x
Presentation Manager
Motif
Open Look

Converting 3270/5250 Screens
Database Access Tools

Client Requirements

GUI Design Standards
Open GUI Standards
Interface Independence
Testing Interfaces
Development Aids

Smart GUI interfaces
Smart SQL Interfaces
Data Dictionaries and Repositories
Smart OLTP Interfaces

UNIT 4 - The Server

Server Hardware
Benchmarks
Categories of Servers

File Server
Application Server
Data Server
Compute Server
Database Server
Communication Server

Features of Server Machines

Multiprocessing
Multithreading
Memory Subsystems
Redundant Components

Classes of Server Machines

Micro/Server
Supersavers
Database Machines

Server Environment

Network Management Environment

Distributed Management Environment
Object Management Architecture
UI-Atlas

Networking Computing Environment

Distributed Computing Environment
Open Network Computing

Network Operating System

Server Requirements
Platform Independence
Transaction Processing

Two-Phase Commits
Transaction Logs

Connectivity

Remote Procedure Calls

Server Data Management and Access Tools

Data Manager Features

Standard SQL Access
Distributed Database Architecture
User Connections

Data Management Software

SYBASE SQL server
Microsoft SQL Server
SQLBase
Netware SQL
Other Options

Database Gateways

EDA/SQL
Database Gateway
SQL Bridge
SYBASE Open Client/Server

UNIT 5 – Client Server and Internet

Client server and internet

Hidden fields
A cookie
Process-per client architecture
Multithreaded architectures

Web client server
3 tier client server web style
CGI
The server side of web

A CGI Scenario

CGI and State

Hidden Fields
Cookies

SQL database servers

The fundamentals of SQL and Relational databases
SQL Database Server Architectures
Stored Procedures, Triggers and Rules
What does a database server do?

Middleware and federated databases

SQL Middleware: The options
SQL API
Open SQL Gateways

Data warehouses

OLTP
Decision Support Systems
Executive Information System
The Elements of Data Warehousing
The Data replication manager
The informational database
The information directory
DSS tool support
Warehouse Hierarchies: The Data marts
Replication Versus Direct Access
The Mechanics of Replication

Benefits of data warehousing

Disadvantages of data warehouses

EIS/DSS to data mining

Query/Reporting Tools
OLAP and Multidimensional Data
Types of OLAP
OLAP Client/Server Interaction

How does data mining work?

GroupWare Server
What is GroupWare?
Components of GroupWare

Multimedia document management
Workflow
Email
Group Conferencing
Group Scheduling

Source: http://www.snscourseware.org/snsct/files/CW_5968bfa4125b4/5.Client_Server_Computing_%20Key%20Notes.doc

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Client Server Computing

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