how to make barcode in vb.net 2010 Top-Level Design Documentation in Software

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Documentation of the dimensional design itself should be broken into two levels of detail. Top-level documentation provides a technical and functional description of each star. Detailed documentation adds column-by-column details, definitions, and data sources. The top-level documentation is likely to be the focal point of the design review sessions. Like the requirements documentation, it can be produced in presentation or document format. Top-level design documentation should include at least three major sections: definitions for each star, definitions for each dimension, and a conformance matrix.
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Sales Calls Proposals Sales Orders Shipments Returns Inventory Inventory Demand Forecast Recievables Sales Goals Commission Payments
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Figure 18-5 Requirements cross-reference
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18 How to Design and Document a Dimensional Model 453
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Stars
Top-level documentation of each star should include all the salient characteristics of the design, stopping short of column-by-column definitions. For each star, salient detail should be provided that, in conjunction with a diagram, provides sufficient material for the design review. The elements that should be captured for each star are enumerated in Table 18-2. This information should be accompanied by a high-level diagram of the star. This diagram should include all columns of the fact table. It need not include every column of each dimension table; their content should be limited to surrogate and natural keys, along with selected attributes of significance. The illustration in Figure 18-6 combines a diagram for the orders process with top-level documentation for the star.
Item Process Type Description A brief description of the process the star measures Type of fact table: transaction, periodic snapshot, or accumulating snapshot States the exact level of detail represented by each row in the fact table Lists facts stored in the fact table Notes Particularly important when grain is specified dimensionally (see below). Also note if the fact table is factless, or if it is an aggregate or derived table (see s 11, 12, 15, and 16). Grain is best stated in business terms, but may also be specified dimensionally (see 3). Highlight any semi-additive facts (see 11) and factless facts (see 12). For nonstored nonadditive facts, list the fully additive components available in the fact table. If a dimension is referenced more than once, also specify roles (see 6). Also list any degenerate dimensions (see 3). Examples include daily, weekly, or real time. List only those that link to requirements in the previous section. (The full list of drill-across possibilities is documented by the conformance matrix, following.) Call out the use of core/custom dimensions ( 13), minidimensions that can be joined to the main dimension for browse ( 6), and bridges that can be used in multiple configurations (s 9, 10). This section may link to a project roadmap or strategy document.
Grain
Facts
Nonadditive Facts Dimension Tables
Lists nonadditive facts that are not stored in the fact table as well as those that are stored Lists all dimension tables that are part of the star
Load Frequency Drilling Across
Indicates how often the fact table is updated Lists important drill-across measurements in which the fact table participates Identify special characteristics of the star, especially those that offer alternative ways to join tables
Usage Notes
Project
Table 18-2
Identifies project during which the star will be created
Top-Level Design Documentation for Stars
Part VI
PART VI
Tools and Documentation
ORDER_FACTS FK day_key product_key FK customer_key FK salesrep_key FK DD order_id DD order_line order_quantity order_dollars cost_dollars margin_dollars
CUSTOMER SK customer_key NK customer_id 1 name_current 2 name_historic 2 billing_address 2 industry HK effective_date expiration_date HK
PRODUCT SK product_key NK sku 1 product_name 2 brand 2 category product_manager 2 HK effective_date expiration_date HK
SALESREP SK salesrep_key NK salesrep_code 1 salesrep_name 2 region_code 2 region_name 2 territory HK effective_date expiration_date HK
Process: Type: Grain: Facts:
Booking Orders Transaction Order information at order line level of detail order_quantity order_dollars cost_dollars margin_dollars Quantity of product on order line using standard unit of measure Extended amount on order line to be billed to customer Extended cost of order line, using standard cost for the period Margin associated with the order line, in dollars. Equivalent to order_dollars minus cost_dollars.
Nonadditive Facts: margin_rate Dimension Tables: Day Product Customer Salesrep Order Line Load Frequency: Daily Drilling Across: Combine with proposal_facts to identify close rate Combines with shipment_facts to study fulfillment lag days Date of the order Product on the order line Customer who placed the order Salesperson who will receive commission on the order (Degenerate) Unique identifier for order line within an order Margin dollars as a percentage of order_dollars
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