غدير عاشور. INTRODUCTION TO INFORMATION SYSTEMS LECTURE 10: NETWORK, COMMUNICATION AND ITS APPLICATION أ/ غدير عاشور ppt download

Instead they can include Data Manipulation Language DML e  The access layer is used to get data out for users
 The integration layer is used to integrate data and to have a level of abstraction from users This divergence can cause problems in the development of programs

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Where data in data warehouse are analyzed to reveal hidden patterns and trends  Data mining is seen as an increasingly important tool by modern business to transform data into business intelligence giving an informational advantage.

شركة غدير عاشور لتنظيم الحفلات
, Oracle without the need for custom coding  It is known as plumbing for IS:  Because it routes data and information transparently between different back-end data sources and end-user applications Digital Network Technologies 11  Rapid change from analog to digital network technologies  Analog: voice-oriented transmission systems designed to transmit the variable electrical frequencies generated by the sound waves of the human voice  Digital: discrete pulse transmission, like computer do  Digital allows:  Higher transmission speed  Larger amounts of information  Greater economy  Lower error rates  Multiple forms of communications on same circuit WIRELESS TECHNOLOGY 12  Change from copper wire-based media and land-based microwave relay systems to fiber-optic lines and cellular, communications satellite, and other wireless technology
INTRODUCTION TO INFORMATION SYSTEMS LECTURE 10: NETWORK, COMMUNICATION AND ITS APPLICATION أ/ غدير عاشور ppt download
 Such as new addressing protocols and satellite-quality streaming video, will likely be deployed to the Internet, but it might take about 10 years
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 Lack of data integration : accessing data from several independent files required writing a special program which is costly and time consuming for some organizations Problems of File Processing 15  Data dependence: in file processing system, files, storage devices, and software are dependent on each other
23 Database Maintenance  Database of an organization need to be updated to reflect new business transactions such as a new sale  Done by transaction processing systems with support of DBMS 24 Application Development  DBMS packages play a major role in application development  Use DBMS software development tools to develop custom application programs  Example: you can use a DBMS to develop the data entry screen, forms, reports or Web pages of a business application that access to a company database to find and update specific data  Application software developers do not need to develop data using conventional programming  It was never intended to replace Internet
6 Distributed Databases 7  Challenge: any data change in one location must be made in all other locations  It was never intended to replace Internet

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This change can be made in one of two ways:  Replication: Look at each distributed database and find changes Apply changes to each distributed database Very complex  Duplication Identify one database as a master Duplicate that database after hours in all locations Easier External Databases  Databases available for a fee from commercial online services or from World Wide Web  Examples: when you use search engine like google or yahoo to look up something on the internet, you are using an external database.

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INTRODUCTION TO INFORMATION SYSTEMS LECTURE 10: NETWORK, COMMUNICATION AND ITS APPLICATION أ/ غدير عاشور ppt download
منظم حفلات الزفاف هل تريد منظم حفلات الزفاف.. إليك أفضل 9 شركات
 Fiber-optic transmission, which uses pulses of laser- generated light, offers significant advantage  Reduce size  Reduce installation effort  Vastly greater communication capacity  Much faster transmission speeds  Freedom from electrical interface  Satellite transmission  Ability to transmit massive amount of data, audio, and video over global networks, especially to isolated areas Internet2 13  Next generation of the Internet  High-performance network that uses an entirely different infrastructure than the public Internet we know today
INTRODUCTION TO INFORMATION SYSTEMS LECTURE 10: NETWORK, COMMUNICATION AND ITS APPLICATION أ/ غدير عاشور ppt download
This caused problems when data is needed to be updated since it required developing each file separately