Oracle Tips by Burleson Consulting
The Data Warehouse Development Life Cycle
The Structured Specification
Most of the system analysis methodologies provide a method for
documenting logical processes, data items, and data stores. These
components generally include:
* Data Flow Diagrams--A set of top-down diagrams which
depict all processes within a system, the data flow among the
processes, and the data stores. Figure 3.3 depicts a sample data
flow diagram. The data flow diagrams (DFDs) begin at a very
general level and become progressively more detailed. The lowest
level of processing is called the functional primitive level, and
this primitive level has been traditionally used as the starting
point for systems design.
* Data Dictionary--A description of all of the logical data
items, including all data flows and data stores (files). The data
dictionary describes how all of the data items are stored and how
they have been transformed by the processes. The data dictionary
file specifications also become the foundation for the relational
tables that will comprise the Oracle warehouse.
* Process Logic Specifications (mini-specs)--A description
of all functional primitive processes. A process is defined as an
operation that modifies a data flow. The tools used to describe
processes include pseudocode, procedure flowcharts, decision
trees, and decision tables.
Figure 3.3 A sample data flow diagram.
This is an excerpt from "High Performance
Data Warehousing", copyright 1997.
like Oracle tuning, you may enjoy the book
Oracle Tuning: The Definitive Reference , with
over 900 pages of BC's favorite tuning tips &
You can buy it
directly from the publisher and save 30%, and get
instant access to the code depot of Oracle tuning