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Mobile / Nomadic Databse

Mobile databases allow users to access data from mobile devices over mobile networks. A mobile database can be stored on the mobile device itself or on a stationary database connected to over a mobile network. Mobile databases must be able to work without a constant network connection due to poor connectivity. They use caching to store recently accessed data locally. Mobile databases provide accessibility to data anywhere and anytime. They use a distributed architecture with fixed hosts, base stations, and mobile units that can handoff control when moving between network cells. Mobile databases face challenges in managing data, transactions, security, and limitations of mobile devices and networks.

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Mobile Databases(University of Hyderabaad) 14mcmc04 Rahul Sharma (MCA)
What is Mobile Databases ? Definition : A mobile database is either a stationary database that can be connected to by a mobile computing device (e.g., smartphons and Laptops) over a mobile network, or a database which is actually stored by the mobile device.
In Detail: Mobile Database System  Mobile users must be able to work without a network connection due to poor or even non- existent connections. A cache could be maintained to hold recently accessed data and transactions so that they are not lost due to connection failure. Users might not require access to truly live data, only recently modified data, and uploading of changing might be deferred until reconnected.  Capabilities: Anywhere,Anytime,Efficiency & Effectiveness.
Model/architect.
Models For Mobile Databases. It is distributed architecture where a number of computers, generally referred to as Fixed Hosts and Base Stations are interconnected through a high-speed wired network. Fixed hosts are general purpose computers configured to manage mobile units. Base stations function as gateways to the fixed network for the Mobile Units.  Each Base station manages those mobile hosts within its cell.  When mobile hosts move between cells, there is a handoff of control from one mobile support station to another.
MDS Applications:  Employee in MNC  Emergencies services (Police, medical, etc.)  Traffic control  E-commerce  Etc.
Issues in Mobile Databases  Data management -Data caching -Representation and storage of mobile data -Data classification  Transaction management -Mobile query processing -Mobile concurrency control -Transaction and error recovery
Other issues: In mobile e-commerce, security in mobile data and transactions are critical Less support in wireless security WEP, IEEE 802.11i Identity authentication Privacy issues of user location
Possible Limitations:  Limited wireless bandwidth and communication speed  Limited power (battery life)  Limited screen size for output  Limited query capability for input  Limited computing & storage capacity  Less secure
Conclusions and summary Wireless network is becoming a commonly used communication platform. It provides a cheaper way to get connected and in some cases this is the only way to reach people. However, it has a number of easy and difficult problems and they must be solved before Mobile Database System can be built. The emerging trend is to make all service providing disciplines, such as web, E-commerce, workflow systems, etc., fully mobile so that any service can be provided from any place. Customer can surf the information space from any location at any time and do their shopping, make flight reservation, open bank account, attend lectures, and so on. This is what the wireless technology driving us to.
References: -Database system issues in nomadic computing : Rafael Alonso. Henry. F. Korth. https://en.wikipedia.org/wiki/Mobile_database https://fb.com/rahulsharma0009 Google.
Thank You :)