barcode vb.net 2010 Transactions, Snapshots, and Accumulating Snapshots 283 in Software

Printer QR-Code in Software Transactions, Snapshots, and Accumulating Snapshots 283

11 Transactions, Snapshots, and Accumulating Snapshots 283
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In some cases, it may be possible to do the reverse: construct a transaction star using an accumulating snapshot as the source. This approach tends to be additional work, however, since most operational data is collected in a format that is closer to the status model. Some variations on the accumulating snapshot design may render this impossible. As you are about to learn, an accumulating snapshot may not include every processing step, instead limiting those measured to major milestones.
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Focus on Key Status Milestones
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In the mortgage processing example, the accumulating snapshot captured the dates and elapsed time at five processing stages. Sometimes the number of possible statuses is far larger. It is not uncommon for an operational system to support a complex process with dozens of possible status values. An accumulating snapshot becomes highly impractical as the number of statuses recorded grows this large. When there is a very large number of status values, an accumulating snapshot can be designed to provide a simplified view of the process. Rather than track each individual status, you can design the snapshot to track the major milestones of a process. Schema designers work with business managers to identify the key milestones, each of which is mapped to one or more status values. These milestones become the subject of the accumulating snapshot. For example, suppose that the mortgage approval process is tracked by an operational system that has far more than five statuses. The status codes in Figure 11-8 illustrate a much more detailed view of the processing activities. The total number of status codes in this case may be closer to 75. Clearly, this is too many statuses to record in an accumulating snapshot.
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status_ code S1 S2 S3 R1 R2 R3 R4 R5 R6 R7 R8 U1
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category Submitted Submitted Submitted Reviewed Reviewed Reviewed Reviewed Reviewed Reviewed Reviewed Reviewed Processed
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status Submitted Under review by officer Awaiting customer response Under review by processor Taxes requested Paystubs requested Credit fee requested Taxes received Paystubs received Credit fee received Credit report ordered Forwarded to underwriter Underwriting activity Processing activity Review activity
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Figure 11-8 A larger set of operational status codes can be mapped to a small number of milestones
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Part IV
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Status Codes from Operational System
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PART IV
Fact Table Design
Although the list of status codes is long, the key metrics of interest to the business are short. Managers want to study the amount of time applications spend between the major milestones of submission, review, and so forth. These milestones imply a series of stages, and the individual status codes can be mapped to these stages, as illustrated to the right of the sample table. Time spent in any of the first three statuses, for example, is counted as part of the review process; time spent in any of the next set of eight statuses is counted as part of the processing stage; and so forth. With statuses mapped to major milestones in this manner, it is possible to build an accumulating snapshot that focuses on the milestones and the time elapsed between them. The resulting star will be no different from the one presented in Figure 11-6, but the ETL process will be more complex. TIP An accumulating snapshot does not have to track every status change recorded in the operational system. It can be designed to track key milestones, or summary-level statuses, that are tracked by the business. Sophisticated status tracking systems may record a good deal of information with each status change, noting a completed milestone as well as the current activity with each status code. They may also provide categories or groupings. Sometimes, categories are exactly what the business wants to study. The status categories in Figure 11-8, for example, happen to map nicely into the major milestones. These groupings do not have to exist in order to summarize a set of statuses, but they may help.
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