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Analytic Databases and Dimensional Design
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32 1
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Analytic Databases and Dimensional Design
This book describes a set of powerful and effective techniques for the design of analytic databases. These techniques unleash business analytics in a very simple way: they model the measurement of business processes. The dimensional model of a business process is made up of two components: measurements and their context. Known as facts and dimensions, these components are organized into a database design that facilitates a wide variety of analytic usage. Implemented in a relational database, the dimensional model is called a star schema. Implemented in a multidimensional database, it is known as a cube. If any part of your data warehouse includes a star schema or a cube, it leverages dimensional design. This chapter introduces the basic concepts of dimensional design, which arose in response to the unique requirements of analytic systems. The concept of measurement is defined in terms of facts and dimensions, and translated into a database design, or star schema. This chapter shows how basic interaction with a star schema can support a wide variety of measurement scenarios, and defines two simple guiding principles for the development of dimensional solutions.
Dimensional Design
Information systems fall into two major categories: those that support the execution of business processes and those that support the analysis of business processes. The principles of dimensional design have evolved as a direct response to the unique requirements of analytic systems. The core of every dimensional model is a set of business metrics that captures how a process is evaluated, and a description of the context of every measurement.
Purpose
Analytic systems and operational systems serve fundamentally different purposes. An operational system supports the execution of a business process, while an analytic system
PART I
Fundamentals
supports the evaluation of the process. Their distinct purposes are reflected in contrasting usage profiles, which in turn suggest that different principles will guide their design.
Operational Systems
An operational system directly supports the execution of a business process. By capturing details about significant events or transactions, it constructs a record of activities. A sales system, for example, captures information about orders, shipments, and returns; a human resources system captures information about the hiring and promotion of employees; an accounting system captures information about the management of the financial assets and liabilities of the business. The activities recorded by these systems are sometimes known as transactions. The systems themselves are sometimes called online transaction processing (OLTP) systems, or transaction systems for short. To facilitate the execution of a business process, operational systems must enable several types of database interaction, including inserts, updates, and deletes. The focus of these interactions is almost always atomic: a specific order, a shipment, a refund. These interactions will be highly predictable in nature. For example, an order entry system must provide for the management of lists of products, customers, and salespeople; the entering of orders; the printing of order summaries, invoices, and packing lists; and the tracking order status. Because it is focused on process execution, the operational system is likely to update data as things change, and purge or archive data once its operational usefulness has ended. When a customer moves, for example, his or her old address is no longer useful for shipping products or sending invoices, so it is simply overwritten. Implemented in a relational database, the optimal schema design for an operational system is widely accepted to be one that is in third normal form. The design may be depicted as an entity-relationship model, or ER model. Coupled with appropriate database technology, this design supports high-performance inserting, updating, and deleting of atomic transactions in a consistent and predictable manner. Developers refer to the characteristics of transaction processing as the ACID properties atomic, consistent, isolated, and durable.
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