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After the extracted data has been processed, the nal step is to load the data into a database This may be loading directly into a star schema in a presentation server or loading data into a third normal form data warehouse
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10
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Figure 10-2 High-level sales fact table data ow diagram
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The participation of the business community is fairly obvious when gathering business requirements Business participation in the construction of the data warehouse is less obvious but just as important At this point in the project, the business people who are needed are those with in-depth knowledge about the current data and reporting methods After looking at why these business people are needed, this section highlights the areas in which business involvement is necessary
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There will be a variety of skill and experience levels on the development team Without guidance from the business, you are expecting the project team to make these critical decisions about the data If there is limited access to the business community, and pressure to deliver something, the project team is likely to forge ahead without business input Consider what really happens: The technical team members decide what they think is better or worse, and then one of the ETL developer makes the decisions Do you really want the business performance results to be reported from a database that was loaded with rules de ned by the technical team s best, and, it is hoped, educated, guess Such an approach rarely delivers results that the business really wants This often results in a subsequent project to rede ne, rebuild, and correct the data to re ect what is really needed Many organizations continue to apply pressure and do not commit business resources, yet fund second, third, and fourth efforts to get it right Make the investment now so that there will not be
Part IV
Building the Project
a need to redo the data warehouse repeatedly In the following sections, you ll look at what needs to happen now, to get it right
De ning Business Rules
The overall design of the ETL system is clearly the responsibility of IT, so what role does the business play in the design process The business must de ne and provide the rules about how to process the data Fortunately, there are dozens of data elements that do not require much work These data elements can be validated and then ow directly into the data warehouse However, it is not always that straightforward Some of the things where business input may be needed include the following: Helping to pick the data source: Suppose there are three different systems that have the customer s home address Which one should be used Perhaps you should always use the accounting system rst, then look in the sales database, and, only if it is not found there, go to the customer feedback system Candidate source systems will be researched by the IT team members, and their ndings can help with the decision-making process De ning processing rules: Representatives from the business community need to work hand-in-hand with the design team to de ne the rules for handling the data What should happen when looking at a sales transaction and the customer does not exist in the reference data Should the sales transaction be loaded with a default customer identi er Should that sales transaction be set aside for further research before it is loaded The business community must provide the input so the appropriate logic can be built into the ETL system De ning integration rules: The business groups are often already using the data that will be loaded into the data warehouse Suppose reports are being produced with data from multiple sources How is this integration being done currently Perhaps it is being processed in an existing reporting system Perhaps it is pulled together manually to create the reports The person who is doing this work has the most knowledge about the details regarding the matching rules and how to handle exceptions The data warehouse team must work with the individuals who have this in-depth knowledge to determine whether this same logic should be applied in the ETL system Sometimes there are no existing integration rules to even start with In that case, the IT and business representatives need to work together to ensure that the data will be integrated appropriately