how to make barcode in vb.net 2010 Mini-Dimensions and Browsability in Software

Generation QR Code in Software Mini-Dimensions and Browsability

Mini-Dimensions and Browsability
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Mini-dimensions do have a potential drawback: they disrupt browsability. The dimension table and the mini-dimension are only related via facts. In the policy example from Figure 6-5, it is
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6 More on Dimension Tables 127
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not possible to create a browse query that shows the list of policies where the policy holder is married. Policies and marital status come from separate tables, related through payment_facts. If there have been no payments, there will be no fact table rows to link these tables. In situations that call for mini-dimensions, this limitation is frequently not a concern. It is rare that users wish to construct browse queries that reach down to the most detailed level of a large dimension. The policy coverage attributes, for example, are used to apply filters to queries, drive subtotals, and so forth. Rarely does a user want to browse through this data to the individual policy level. It is possible to provide limited browsability between a dimension and mini-dimension. This can be achieved by adding a foreign key to the dimension table that refers to the mini-dimension. This reference represents the current corresponding mini-dimension row. In the case of policy, for example, the record for Hal Smith can be supplemented with a foreign key to the policy_coverage table, representing the current coverage characteristics for Hal. In Figure 6-6, this is done by adding pol_coverage_key_current to the policy table. This foreign key just happens to be the same mapping that ETL developers need in order to load facts properly, as discussed earlier. The cross-browsability enabled by keeping a mini-dimension key in the dimension is limited. For each dimension row, it is only possible to look at the current information in the mini-dimension. History is not maintained. For example, it is only possible to see the current policy coverage data for Hal Smith s policy; if his coverage details change, the foreign key is updated in the policy table. In this respect, the foreign key is treated like a type 1 attribute. Tracking the change history or treating the foreign key reference as a type 2 attribute would require a new row to be inserted into the policy table each time Hal Smith s coverage changed. That would defeat the original purpose of the mini-dimension, which was to stem the growth of the policy table.
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DAY PAYMENT_FACTS INVOICE day_key invoice_key customer_key product_key policy_key policy_coverage_key . . . (facts) . . . POLICY policy_key policy_number policy_holder address pol_coverage_key_current . . .
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POLICY_COVERAGE pol_coverage_key family_size covered_parties spouse_coverage covered_children deductible_amount . . .
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Figure 6-6
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A foreign key links policy to the policy_coverage mini-dimension
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Part III
PART III
Dimension Design
TIP A dimension can carry a foreign key reference to a mini-dimension. This reference will help ETL developers when populating fact table rows, and allow users to cross-browse the dimension and mini-dimension. It should not be charged with carrying history, as this would defeat the purpose of the mini-dimension. As was observed with the split dimension table, this foreign key reference may pose a technical obstacle in the configuration of business intelligence tools that automatically generate queries. When users browse the dimension and mini-dimension, the tables should be joined using the direct relationship between the tables. When users query the fact tables, however, the mini-dimension should be joined to the fact table, not the dimension table. The dimension table s foreign key reference to the mini-dimension should never be used in the join to the fact table, although it may appear to a developer that this is appropriate. If needed, the full history of the relationships between a dimension and a mini-dimension can be preserved by designing an additional fact table. Each row will identify a row in the dimension, a row in the mini-dimension, and the time frame during which they were associated. It is quite possible that there will be no facts in this table (factless fact tables will be discussed in 12).
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