1 / 13

Mobile Database

Mobile Database. Mobile Database. Mobile database

romeol
Download Presentation

Mobile Database

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Mobile Database www.assignmentpoint.com

  2. Mobile Database • Mobile database • A mobile database is either a stationary database that can be connected to by a mobile computing device - such as smart phones or PDAs - over a mobile network, or a database which is actually carried by the mobile device. This could be a list of contacts, price information, distance traveled, or any other information. • A mobile database is a database that can be connected to by a mobile computing device over a wireless mobile network. • Mobile databases: • Physically separate from the central database server. • Resided on mobile devices. • Capable of communicating with a central database server or other mobile clients from remote sites. • Handle local queries without connectivity. www.assignmentpoint.com

  3. Mobile Database • Why Mobile database • Number of smart phones in use around the world is increasing. • More businesses move toward employees mobility. • Powerful lightweight computing devices and low cost mobile connectivity paved the way for data-driven applications. • Mobile data-driven applications enable us to access any data from anywhere, anytime. www.assignmentpoint.com

  4. Mobile Database • Some Mobile database Applications • Traffic control • Taxi dispatch • Emergencies services: police, medical, fire, … • Car navigation • Location-aware search and recommendation • Social applications: information / opinion sharing and search among community • Shopping cart • Food cart • Inventory System • Mobile portals www.assignmentpoint.com

  5. Mobile Database • Capabilities • Anywhere: can physically move around without affecting data availability • Anytime: can store and retrieve any data whenever mobile connection is available • Efficiency: can process mobile data efficiently • Effectiveness: can give users what they really want . www.assignmentpoint.com

  6. Mobile Database • 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 www.assignmentpoint.com

  7. Mobile Database • Example of Mobile Database Existing mobile databases are: • Sybase SQL anywhere • Oracle Lite • Microsoft SQL Server Compact • SQLite • IBM DB2 Everywhere www.assignmentpoint.com

  8. Mobile Database • Architecture www.assignmentpoint.com

  9. Mobile Database • Operation • It is distributed architecture where a number of computers, generally referred to as Fixed Hosts and Base Stations (BS) are interconnected through a high-speed wired network. • Fixed host: general purpose computers configured to manage mobile units. • Base stations: function as gateways to the fixed network for the Mobile Units. www.assignmentpoint.com

  10. Mobile Database • Operation • Mobile Units (MU) or hosts and base stations communicate through wireless channels having bandwidth significantly lower than those of a wired network. • A downlink channel is used for sending data from BS to MU and an uplink channel is used for sending data from MU to its BS. • Mobile units are battery powered portable computers that move freely in a geographic mobility domain, an area that is restricted by the limited bandwidth of wireless communication channels. • To manage the mobility of units, the entire geographic mobility domain is divided into smaller domains called cells. www.assignmentpoint.com

  11. Mobile Database • Operation • The mobile computing platform can be effectively described under the client-server paradigm, • We may sometimes refer to a mobile unit as a client or sometimes as a user, and the base stations as servers. • Each cell is managed by a base station, which contains transmitters and receivers for responding to the information-processing needs of clients located in the cell. • We assume that the average query response time is much shorter than the time required by the client to physically traverse a cell. • Clients and servers communicate through wireless channels. • The communication link between a client and a server may be modeled as multiple data channels or as a single channel. www.assignmentpoint.com

  12. Mobile Database • Data Used in Mobile Applications Data may be classified into three categories: • Private data: A single user owns this data and manages it. No other user may access it. • Public data: This data can be used by anyone who can read it. Only one source updates it. Examples include weather bulletins or stock prices. • Shared data: This data is accessed both in read and write modes by groups of users. Examples include inventory data for products in a company.  www.assignmentpoint.com

  13. Mobile Database • Data Used in Mobile Applications • Public data is primarily managed by vertical applications. • Shared data is used by horizontal applications, possibly with some replication. • Copies of shared data may be stored both in base and mobile stations. This presents a variety of difficult problems in transaction management consistency as well as integrity and scalability of the architecture. www.assignmentpoint.com

More Related