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The IBM Cognos tool, Decision Stream or by it's latest version name Data Manager, is one of the ETL development tools available to support data delivery. Data Manager has all of the functionality needed to extract the data from the source system, create the necessary programming to transform the data, and deliver it to the warehouse.

Extract the source data

Once the BI analyst has worked with the business user to determine the requirements necessary, an ETL programmer begins by writing a SQL statement against the source system(s) to gather all the required elements. It is a best practice to simply pull the data from the source system without attempting to make any changes to it. In the extract process, the best performance will be from a simple select statement. The Decision Stream tool calls this the data stream.

Transformations of extracted data

The temporary work table has all the data elements required to support the transformation step. The transformation step is the "meat and potatoes" of building a structured data warehouse. All of the elements extracted from the source system(s) are used in this step. The Decision Stream tool has derivations, dimensional lookups, and functions, to provide the programmer with all the tools needed to transform the data to meet the business requirements. The tool calls this the transformation model.

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