how to make barcode in vb.net 2010 Hierarchies and Snowflakes 165 in Software

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7 Hierarchies and Snowflakes 165
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Eliminating Repeating Groups with Outriggers
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If concerns about row length or ETL consistency cannot be addressed by other means, the solution may be to add an outrigger table. The repeating attributes are placed in a separate table, the outrigger, which is given its own surrogate key. In the original dimension table, the relocated attributes are replaced with one or more foreign key references to the outrigger. TIP Outriggers may be considered when a set of attributes repeats within a single dimension table or appears in more than one dimension table. Two outriggers can be constructed for the salesrep dimension that appeared in Figure 7-6. The ten location attributes that appear once for the salesperson s work site and once for the office to which the salesperson reports are moved into a separate location table, depicted in Figure 7-7. This outrigger contains a surrogate key called location_key.
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DAY day_key full_date day_of_week_number day_of_week_name day_of_week_abbr day_of_month holiday_flag weekday_flag weekend_flag month_number month_name month_abbr quarter quarter_month year year_month year_quarter fiscal_period fiscal_year fiscal_year_period LOCATION location_key location_id location_name location_type location_address1 location_address2 location_city location_state location_zipcode location_zip_plus5 location_main_phone
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PRODUCT SALESREP salesrep_key saleperson_id salesperson_name territory_code territory_name region_code region_name region_manager hire_day_key last_reivew_day_key reporting_location_key work_location_key ORDER_FACTS CUSTOMER
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Two outriggers for the salesrep dimension
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Dimension Design
Instead of 20 location attributes, the salesperson dimension includes two foreign key references to the location table: one for the work location and one for the reporting location. Similarly, the two sets of date attributes are replaced by a pair of day_keys: one for the date of hire and one for the date of the salesperson s last review. To query a schema that includes outriggers in multiple roles, you must use the aliasing techniques described in 6. An alias is created for each role played by an outrigger, through either SQL, the use of a view, or the capabilities of the reporting tool. Each alias is joined to the appropriate foreign key in the base dimension table, as determined by its role. To query the schema in Figure 7-7, it may be necessary to alias location twice once for the work site and once for the reporting location. The date table may be aliased three times. Two of these aliases are outriggers for salesrep: the date of hire and the date of last review. The other alias for date is the date of the order, which joins directly to order facts. The set of aliases that can be used when querying this star is depicted in Figure 7-8. As Figure 7-8 illustrates, the presence of outriggers increases the number of joins that may be involved in querying the star. This translates into an increase in complexity, and potentially a decrease in performance. Additional complexity is unnecessary from a user s point of view, but it is possible to hide the outrigger by replacing the dimension and outriggers with a view. A negative impact on query performance may be more serious. Even if outriggers do not confuse the database s ability to perform a star join, they still increase the number of joins that must be processed. The presence of outriggers in Figure 7-8 doubles the number of potential joins to process when querying order facts. Without outriggers, this star would require a maximum of four joins; with the outriggers, it includes eight joins. TIP Outriggers may be used to streamline ETL or reduce row length, but they introduce complexity and may have an impact on query performance. If you are considering using an outrigger, evaluate the impact it will have on the performance of your database optimizer and the usability of your schema. Given the potential drawbacks, outriggers should be used sparingly. If row length is a legitimate technical concern for a very wide dimension, refer to 6 for other techniques to try first. You may be able to define multiple dimensions or construct
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