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by Burleson Consulting

The Data Warehouse Development Life Cycle

Here, you can see that the data is pulled from the Oracle OLTP database using Oracle’s SQL*Net facility. For details on this distributed SQL technique, see Chapter 9, Distributed Oracle Data Warehouses. Also, note the dissection of the sales_date column. Rather than store the sales_date as a single column of the date datatype, the Oracle data warehouse transformation stores the sales_date in three columns: one for the day, another for the month, and a third column for the year. The reason for this date breakout will become clear later in this chapter when we discuss data query analysis.

Data Warehouse Loading Analysis
The third process involved in data warehouse analysis is the analysis of loading data into the data warehouse. Analysis of data loading involves understanding how the data is going to be extracted from the target system, how the data will be cleansed and validated, and how the data will be loaded, aggregated, and summarized at warehouse load time. Most Oracle professionals use Oracle’s referential integrity to validate incoming warehouse data. Referential integrity can be used to check for valid data values and ensure that all data relationships are maintained. Because referential integrity is only used at load and purge time, it causes no performance problems to the Oracle data warehouse, especially since loading is generally done during off hours. For more information on using Oracle utilities with Referential Integrity, see Chapter 9, Oracle Data Warehouse Utilities.. Figure 3.15 displays methods for cleansing, validating, and loading Oracle data into a data warehouse.

Figure 3.15 Methods for cleansing, validating, and loading Oracle data.

For more information on using Oracle’s SQL*Loader for Oracle warehouse loads, see Chapter 11, Oracle Data Warehouse Utilities.

This is an excerpt from "High Performance Data Warehousing". To learn more about Oracle, try "Oracle Tuning: The Definitive Reference", by Donald K. Burleson.  You can buy it direct from the publisher at 30% off here:


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