A grocery chain used the data mining capacity of a software to analyze local buying patterns. They discovered that when men bought diapers on Thursdays and Saturdays, they also tended to buy beer. Further analysis showed that these shoppers typically did their weekly grocery shopping on Saturdays. On Thursdays, however, they only bought a few items. The retailer concluded that they purchased the beer to have it available for the upcoming weekend.
OLAP stands for OnLine Analytical Processing and it deals with Historical Data or Archival Data. Historical data are those data that are archived over a long period of time. OLAP helps to answer multi-dimensional analytical (MDA) queries in a fast manner.
Both Bill Inmon and Ralph Kimball are stalwarts of data warehousing and business intelligence industry, they have contributed immensely to define standards and frameworks. They each have defined methods to design data warehouse for any company. Both philosophies have their own advantages and differentiating factors, and enterprises continue to use either of these.
Today it is not just the large organizations, be it a small company or a midsized firm - every moden company needs some kind of business intelligence solution to be competitive in the market.
Term ETL refers to methods access and manipulate source data and load it into target data. ETL is the abbreviation of three words Extract, Transform and Load.
Purpose of ETL process is to extract data, mostly from different types of systems, transform it into a structure that’s more appropriate for reporting and analysis and then finally load it into the target database, usually a data warehouse.