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Oracle Tips
by Burleson Consulting
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The Data Warehouse Development Life Cycle
Data Warehouse Development Methods
Phase 3: Systems Design systems analysis design
implementation warehouse
The systems design phase is the physical implementation of the
logical data model that was developed in the systems analysis phase.
This includes the design of the warehouse, specifications for data
extraction tools, data loading processes, and warehouse access
methods. At this phase, a working prototype should be created for
the end-user.
The system design phase is also where the logical documentation is
transformed into a physical structure. For database design, this
involves the creation of the entity/relation model, and the
determination of appropriate data storage techniques and index
usage. This phase is where a thorough understanding of Oracle
architecture will pay off. For more information on this topic, see
Chapter 4, Data Warehouse Design.
Phase 4: Implementation
The implementation phase is the phase in which the warehouse is
constructed and the software is written and tested.
As shown in Figure 2.1, the implementation phase normally consumes
as much effort as all of the other steps combined. Advocates of
object-oriented development claim that this is a direct result of a
failure of the team to do a thorough job in the analysis and design
phases. They argue that this phase is time consuming because hidden
anomalies are discovered and code must be revised constantly to
accommodate new insights into the nuances of the system. Regardless
of the reason why, it remains true that the implementation phase is
by far the most time-consuming phase in the creation of a warehouse
system.
Oracle also has some very specific rules and techniques that can be
used to ensure maximum performance. There are several chapters
devoted entirely to Oracle-specific topics, but the text will first
concentrate on providing a firm conceptual understanding of data
warehouse design for relational databases.
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