Figure 18-6 Top-level documentation for the orders star in Software

Creating QR-Code in Software Figure 18-6 Top-level documentation for the orders star

Figure 18-6 Top-level documentation for the orders star
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18 How to Design and Document a Dimensional Model 455
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Top-level documentation of each star need not require more than two pages in document format. This same information can also be provided in presentation format, which can be useful for design review sessions. This information does not complete the top-level documentation; it is also necessary to provide top-level documentation for dimension tables, as well as a conformance matrix.
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Top-level documentation must also include detailed information about dimension table design. Sufficient information should be included to communicate the scope and use of the dimension table, and to facilitate review of important design considerations. Required elements for top-level documentation of dimension tables are enumerated in Table 18-3. The detailed design, covered later in this chapter, will supplement this top-level documentation with column-by-column definitions, data types, sources, transformation logic, and the like. This information should be accompanied by diagrams that illustrate key features of the dimension, such as conformance with other dimensions, participation in significant hierarchies, or core/custom relationships. These diagrams need not capture all columns; detailed column definitions will appear in the detailed documentation. The illustration in Figure 18-7 combines top-level documentation for a salesrep dimension with depictions of conformed rollups and a major hierarchy.
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Description Brief description of the dimension table Lists the column or columns that constitute the natural key in the source system(s) Lists any dimensions that conform with the table Lists any hierarchies of importance
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Notes Use business terms whenever possible. This is essential information for the development of a load process and also informs slow change behavior. Each conformed dimension should also be documented separately. List hierarchies that will be used to drive reporting, guide analysis, configure reporting tools, or drive auto-generation of derived tables (see s 7 and 15). Highlight junk dimensions ( 3), mini-dimensions ( 6), potential use as an outrigger ( 7), use of special case rows ( 6), any relationships to bridge tables (s 9, 10) and core/ custom versions ( 13). This section may link to a project roadmap or strategy document.
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Conformed Dimensions Significant Hierarchies
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Special characteristics of the dimension, especially those that offer alternative ways to join tables
Project
Table 18-3
Identifies project during which the dimension will be created
Top-Level Design Documentation for Dimension Tables
Part VI
PART VI
Tools and Documentation
SALESREP salesrep_key SK salesrep_name 1 salesrep_id NK salesrep_type territory 2 territory_code 2 territory_manager 2 region 2 region_code 2 region_vp 2 effective_date expiration_date current_version ... Dimension: Salesrep Definition: One row per salesperson Natural Key: Salesrep_id Conformed Dimensions: TERRITORY territory_key SK territory 2 territory_code 2 territory_manager 2 region 2 region_code 2 region_vp 2 ...
ALL SALESREPS
REGION REGION region_key region region_code region_vp ... SK 2 2 2 TERRITORY
SALESREP
Conformed rollups Territory and Region share attributes as illustrated Significant Hierarchies: All Salesreps (1) Region (6) Territory (650) Salesrep (766) Usage Notes: The salesrep_type column contains either the value Salesrep or the value Invalid. An additional row is included in the salesrep dimension table for use when the salesperson associated with an order cannot be determined. This row has the salesrep_type Invalid and N/A for all other attributes. effective_date and expiration_date are inclusive indicators of the calendar dates during which the record was effective for the natural key value. For the current record corresponding to a natural key value, the expiration date is set to 12/31/9999 and current_version is set to Current. For expired versions corresponding to a natural key value, current_version is set to Expired.
Figure 18-7 Top-level documentation for the Salesrep dimension
Other key information that may be included in top-level documentation for dimension tables includes: Type 3 and hybrid slow change characteristics, which may be illustrated as depicted in Figures 8-4 and 8-6 Implementation of a mini-dimension, and optional relationship to the main dimension, as depicted in Figure 6-6 or Figure 16-8
18 How to Design and Document a Dimensional Model 457
Use of outriggers, as depicted in the top portion of Figure 7-9 Core and custom versions, as depicted in Figure 13-2 Configurations for bridge tables, as illustrated in Figures 16-9, 16-10, and 16-11 As with the stars, top-level dimension documentation may be provided in document or presentation format. This material will be the primary focus of design reviews. Detailed documentation will add column specifications, definitions, sources, and transformation rules.
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