1. Applications

1. Applications
	Chapter 24. Extra: Distributed Applications

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1. Applications

1.1. Traditional Client/Server applications

1.1.1. Characteristics

Just one server and many clients.
Fixed addresses servers.
Each kind of server has its own communication protocol.

1.1.2. Examples

File Servers: NFS

File Transfer Servers: FTP

Remote login Servers: Telnet

1.2. New Client/Server applications

1.2.1. Characteristics

Many servers and many clients
Location transparency.
Unified protocols for groups of applications.
Secure access.
Administrative tools

1.2.2. Examples

RDB Servers: Sybase

Groupware: World Wide Web.

Object Oriented: CORBA.

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1.3. The Client/Server Infrastructure

1.3.1. Graphic View

Figure 24.1. Middleware View

Middleware View

1.3.2. Client

GUI - Graphic User Interface
OOUI - Object Oriented User Interface
DSM - Distributed System Management (Client side)

1.3.3. Middleware

Service Specific
SQL middleware
ODBC (Open Database Connectivity)
ORB (Object Request Broker)
NOS - Network Operating System
RPC (Remote Procedure Calls)
Security
Distributed File System
Transport Stack
TCP/IP
NetBIOS
IPX/SPX
DSM - Distributed System Management (Middleware)

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1.3.4. Server

DBMS
TP (Transaction Processing) Monitors
Groupware
Objects
DSM - Distributed System Management (Server side)

1.4. Client/Server Application Models

1.4.1. Requirements

Rich transaction processing
- Nested transactions that can span servers
- Transactions that execute over long periods of time
- Secure transactions.
Roaming agents
- Personal and Dealer agents.
- Sniffer agents (to search for information).
Rich data management
- Create, store, view and edit compound documents from anywhere on the network.
- Compound document technology (like OLE or OpenDoc).

1.4.2. The models

SQL databases
TP Monitors
Groupware
Distributed Objects

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Copyright © 1998-2009 Dilvan Moreira


Chapter 24. Extra: Distributed Applications		2. SQL Databases