Round Up the Requirements
Establishing the architecture of an ETL system begins with one of the toughest challenges: rounding up the requirements. By this we mean gathering and understanding all the known requirements, realities, and constraints affecting the ETL system. The list of requirements can be pretty overwhelming, but it’s essential to lay them on the table before launching into the development of the ETL system.
The ETL system requirements are mostly constraints you must live with and adapt your system to. Within the framework of these requirements, there are opportunities to make your own decisions, exercise judgment, and leverage creativity, but the requirements dictate the core elements that the ETL system must deliver. The following ten sections describe the major requirements areas that impact the design and development of the ETL system.
Before launching the ETL design and development effort, you should provide a short response for each of the following ten requirements...