Part III in Visual Studio .NET

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Part III
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Dealing with the Data
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Characteristics of the Model across the Enterprise
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As a data warehouse grows over time or a broad model is developed up front, there can be many dimensions and fact groups It is not unheard of to have thirty or forty different dimensions as you look across an enterprise You are likely to nd is that a core set of dimensions is used repeatedly These must be conformed! The other dimensions are typically used for fact groups that pertain to only one part of the business Using an education example, the school district, student, and teacher dimensions will be used for many fact groups Dimensions about student disciplinary actions, extracurricular activities, or teacher licensure pertain only to some of the fact groups
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T I P While enterprise-wide models may have over thirty dimensions and fact
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groups, keep in mind that any single fact group will have between ve and fteen dimensions
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Many organizations are already involved in data warehousing, perhaps even having multiple data warehouses These have often been built without using conformed dimensions By bringing the dimensions and facts together into a single model, this can be a good start toward understanding what will be needed to integrate these stovepipe databases Many enterprise-level dimensional models can be complex, because of the breadth that is included Most users have an interest only in a subset of this model The scope of what is presented to each group of users can be tailored to meet its own speci c needs Very few people in the organization may see or have a need to use the entire model
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ENTERPRISE DESIGN GUIDELINES
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Design broadly Don t try to tackle all data for the enterprise at once Design at the lowest level of detail that is captured Work with multiple user groups who use the same data Always consider an enterprise viewpoint who else could use this data Always design and plan for conformed dimensions The dimensional model can be implemented in several increments Each increment should deliver business value Review and update the model with each increment
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7
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Modeling the Data for your Business
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The basic principles of dimensional modeling have been presented Now it is time to take a practical look at how the model is created
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Business Participation in the Modeling Process
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This section outlines the steps involved in developing the business dimensional model The description of the ow is geared more toward the project team, but it would still be valuable for any reader The core project team, including the business analyst, must prepare for the modeling sessions and then develop a rst draft With subsequent re nements of the model, additional business representatives need to be included to get appropriate feedback Finally, the model can be shared with anyone from the data warehouse target business audience
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Creating the First Draft
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One of the keys to getting the rst cut of the model is having the right resources working together The dimensional modeler is the team member who drives this entire process The business analyst(s) who helped gather the business requirements is needed to ensure that the discussion is put into the proper context The systems staff members who support and maintain the source systems are needed to help understand the incoming data elements The nal resource to include in the initial modeling sessions is the lead ETL developer This person will be taking the model forward for implementation and is the individual most likely to take notes about any implementation-related issues that crop up during modeling Key business people are not needed yet Once an initial draft of the model is sketched out, then their assistance is needed All of the participants should have at least an introductory knowledge of the parts of the dimensional model: facts and dimensions
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Preparing for Modeling Sessions
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In order to make the modeling sessions as productive as possible, the project team needs to do several things If possible, block out a conference room for three straight days As the model is drafted, the parts that have been diagrammed are posted on the walls Changing conference rooms wastes a lot of time removing and putting the diagrams back on the walls It also presents a big disruption in the continuity of thought, so try to stay in the same room if possible The following checklist details the items you need for these sessions
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