Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Question
Chapter 23, Problem 1PE
Program Plan Intro
Distributed
A distributed database is a database that comprises of two or more files situated in various destinations either on a similar system or on altogether various systems. This database can be stored on different storage devices and processing is distributed among multiple databases.
Local Area Network:
- Local area network is a network that covers a small geographical area such as homes, offices and groups of buildings.
- Local Area Network has higher bandwidth rates.
- It runs at a bandwidth speed of 100 Mbps, 1Gbps or 10 Gbps.
- The network speed which is the speed in which data packets are transported is faster for LAN than for a WAN.
Wide Area Network:
- Wide area network is a network that covers large geographical areas that can span the globe.
- Wide area network has lower bandwidth rates compared with local area network.
- Wide area networks run on bandwidth of 20 Mbps, 50 Mbps or 100 Mbps.
- The network speed which is the speed in which data packets are transported is slower for WAN.
Expert Solution & Answer
Explanation of Solution
Key differences between a local-area network and a wide-area network, that affect the design of a distributed database:
| Local Area Network | Wide Area Network |
| LAN is used in private areas | WAN is used in public areas |
| The data transfer rate is higher for LAN than for a WAN | The data transfer rate is slower for WAN |
| The throughput cannot be raised through replication and fragmentation | The throughput can be raised through replication and fragmentation |
| The maintenance cost for a LAN is lower as it covers only smaller areas. | The maintenance cost for a WAN is higher as it covers larger areas. |
| LAN has less congestion compared to WAN | WAN has more congestion compared to LAN |
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