Mastering Data Warehouse Design

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Welcome to the first book that thoroughly describes the data modeling techniques used in constructing a multipurpose, stable, and sustainable data warehouse used to support business intelligence (BI). This chapter introduces the data warehouse by describing the objectives of BI and the data warehouse and by explaining how these fit into the overall Corporate Information Factory (CIF) architecture. It discusses the iterative nature of the data warehouse construction and demonstrates the importance of the data warehouse data model and the justification for the type of data model format suggested in this book. We discuss why the format of the model should be based on relational design techniques, illustrating the need to maximize non redundancy, stability, and maintainability. Another section of the chapter outlines the characteristics of a maintainable data warehouse environment. The chapter ends with a discussion of the impact of this modeling approach on the ultimate delivery of the data marts. This chapter sets up the reader to understand the rationale behind the ensuing chapters, which describe in detail how to create the data warehouse data model.

Overview of Business Intelligence

BI, in the context of the data warehouse, is the ability of an enterprise to study past behaviors and actions in order to understand where the organization has been, determine its current situation, and predict or change what will happen in the future. BI has been maturing for more than 20 years. Let’s briefly go over the past decade of this fascinating and innovative history.

You’re probably familiar with the technology adoption curve. The first companies to adopt the new technology are called innovators. The next category is known as the early adopters, then there are members of the early majority, members of the late majority, and finally the laggards. The curve is a traditional bell curve, with exponential growth in the beginning and a slowdown in market growth occurring during the late majority period. When new technology is introduced, it is usually hard to get, expensive, and imperfect. Over time, its availability, cost, and features improve to the point where just about anyone can benefit from ownership. Cell phones are a good example of this. Once, only the innovators (doctors and lawyers?) carried them. The phones were big, heavy, and expensive. The service was spotty at best, and you got “dropped” a lot. Now, there are deals where you can obtain a cell phone for about $60, the service providers throw in $25 of airtime, and there are no monthly fees, and service is quite reliable.

Data warehousing is another good example of the adoption curve. In fact, if you haven’t started your first data warehouse project, there has never been a better time. Executives today expect, and often get, most of the good, timely information they need to make informed decisions to lead their companies into the next decade. But this wasn’t always the case. 

BI Architecture

One of the most significant developments during the last 10 years has been the introduction of a widely accepted architecture to support all BI technological demands. This architecture recognized that the EIS approach had several major flaws, the most significant of which was that the EIS data structures were often fed directly from source systems, resulting in a very complex data acquisition environment that required significant human and computer resources to maintain. The Corporate Information Factory (CIF) 

The Corporate Information Factory.

  • ■■ Getting data in consists of the processes and databases involved in acquiring data from the operational systems, integrating it, cleaning it up, and putting it into a database for easy usage. The components of the CIF that are found in this function:
  • ■■ The operational system databases (source systems) contain the data used to run the day-to-day business of the company. These are still the major source of data for the decision support environment.
  • ■■ The data warehouse is a collection or repository of integrated, detailed, historical data to support strategic decision-making.
  • ■■ The operational data store is a collection of integrated, detailed, current data to support tactical decision making.
  • ■■ Data acquisition is a set of processes and programs that extracts data for the data warehouse and operational data store from the operational systems. The data acquisition programs perform the cleansing as well as the integration of the data and transformation into an enterprise format. This enterprise format reflects an integrated set of enterprise business rules that usually causes the data acquisition layer to be the most complex component in the CIF. In addition to programs that transform and clean up data, the data acquisition layer also includes audit and control processes and programs to ensure the integrity of the data as it enters the data warehouse or operational data store.
  • ■■ Getting information out consists of the processes and databases involved in delivering BI to the ultimate business consumer or analyst. The components of the CIF that are found in this function:
  • ■■ The data marts are derivatives from the data warehouse used to provide the business community with access to various types of strategic analysis.
  • ■■ The oper marts are derivatives of the ODS used to provide the business community with dimensional access to current operational data.
  • ■■ Data delivery is the process that moves data from the data warehouse into data and oper marts. Like the data acquisition layer, it manipulates the data as it moves it. In the case of data delivery, however, the origin is the data warehouse or ODS, which already contains highquality, integrated data that conforms to the enterprise business rules. 
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