ITM 102 Chapter Notes - Chapter 6: Business Intelligence, Data Cleansing, Teijin

• School: Ryerson University
• Department: Information Technology Management
• Course: ITM 102
• Professor: Franklyn Prescod

Document Summary

A bit represents the smallest unit of data a computer can handle (0) A byte is a group of bits (0100 1001) A grouping of characters into a work or a complete number is called a field (is 101) A group of related fields (a student"s name) comprises of a record (39044) A group of records of the same type is called a file (39044, 59432, 64029) An entity is a person, place, thing, or event about which we store and maintain the information. Each characteristic or quality describing a particular entity is called an attribute. As the organization has hundreds of programs and application, it is very difficult to maintain and manage the environment. Data redundancy is the presence of duplicate data in multiple data files so that the same data are stored in more than one place or location. Data redundancy wastes storage resources and also leads to data inconsistency, where the same attribute may have different values.