MGT300, Chapter 8: Accessing Organizational Information (Data Warehouse)

History of Data Warehousing
  • Data warehouses extend the transformation of data into information
  • The data warehouse provided the ability to support decision making without disrupting the day-to-day operations.

Data Warehouse Fundamentals
  • Data warehouse is a logical collection of information gathered from many different operational databases that supports business analysis activities and decision making tasks.
  • The primary purpose of a data warehouse is to aggregate information throughout an organization into a single repository for decision - making purposes
  • all of information have in data - warehouse
  • Extraction, transformation, and loading (ETL)
 a process that extracts information from internal and external databases, transforms the information using a common set of enterprise definitions, and loads the information into a data warehouse.
  • Data mart
contains a subset of data warehouse information

Multidimensional Analysis and Data Mining
  • Databases contain information in a series of two-dimensional tables
  • In a data warehouse and data mart, information is multidimensional, it contains layers of columns and rows
  • dimension - a particular attribute of information 
  • Cube - common term for the representation of multidimensional information
  • Data mining - the process of analyzing data to extract information not offered by the raw data alone.
  • To perform data mining users need data-mining tools
data-mining tool - uses a variety of techniques to find patterns and relationships in large volumes of information and infers rules that predict future behavior and guide decision making

Information Cleansing or Scrubbing
An organization must maintain high-quality data in the data warehouse
  • accurate
  • complete
  • uniqueness

Information cleansing or scrubbing - a process that weeds out and fixes or discards inconsistent, incorrect, or incomplete information. Contact information in an operational system.

Business Intelligence
  • information that people use to support their decision-making efforts
  • principle BI enablers include:
  • technology
  • people
  • culture