IT 2101 Lecture Notes - Lecture 10: Data Mining, File Server, Data Warehouse
9 Oct 2016
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Document Summary
Data: facts or observations about people, places, things, and events. Data was limited to numbers, letters, and symbols recorded by keyboards. Audio captured, interpreted, and saved using microphones and voice recognition systems. Music downloads from the internet and saved on smartphones, tablets, and other devices. Photographs captured by digital cameras, edited by image editing software, and shared with others over the internet. Video captured by digital video cameras, tv tuner cards, and webcams. There are two ways or perspectives to view data. These perspectives are the physical view and the logical view. The physical view focuses on the actual format and location of the data. The logical view focuses on the meaning, content, and context of the data. End users and most computer professionals are concerned with this view. In logical view, data is organized into groups or categories. Each group is more complex than the one before. Character: a character is the most basic logical data element.
