how to make barcode in vb.net 2010 Changes in operational data in Software

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Changes in operational data
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the operational system, it may be best simply to update the record for Sue in a customer dimension table. Sue s address change, on the other hand, may have more significance. She may have placed some orders while living in Arizona and some more orders while living in California. If someone is studying order history by state, it is important that each of Sue s orders be associated with the correct state. These two changes to customer 9900011 can be used to illustrate the most common types of slow change response in a star schema: the type 1 slow change and the type 2 slow change. These responses overwrite transaction history and preserve it, respectively. There is also a less common type 3 response. It is used in situations that do not require historic context but do call for use of both the before and after values of the changed data element.
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When the source of a dimension value changes, and it is not necessary to preserve its history in the star schema, a type 1 response is employed. The dimension is simply overwritten with the new value. This technique is commonly employed in situations where a source data element is being changed to correct an error. By overwriting the corresponding dimension in the star schema, the type 1 change obliterates the history of the data element. The star carries no hint that the column ever contained a different value. While this is generally the desired effect, it can also lead to confusion. If there were any associated facts before the change occurred, their historic context is retroactively altered.
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Overwriting the Dimension Value
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Recall, for example, the change in date of birth for Sue Johnson. According to Figure 3-6, Sue Johnson was initially recorded as having a birth date in 1961. Later, her date of birth was updated to show she was born in 1971. People s birth dates do not change, so when this information was updated in the source system, it was presumably the correction of an error. Assume that a star schema has been developed to track the orders process, with a dimension table called customer. This table carries the customer_id as a natural key, and also has columns for the customer s name, date of birth, and state of residence. The top portion of Figure 3-7 shows the state of affairs in the star schema before any changes have occurred. In the customer dimension table, there is a row for Sue, which is highlighted. You can see that this row contains the customer_id 990001. This is a natural key column; it identifies the record for Sue in the source system. There is also a surrogate key called customer_key, which contains the value 1499. Sue s date of birth is shown as 3/2/1961, and her state is shown as AZ. Presumably, there are numerous other columns in the customer table that are not shown in the picture. Just below this table, still in the top half of Figure 3-7, a row from a fact table is shown. The customer_key in this row is 1499, which refers to Sue s record in the customer dimension table. You can interpret this row as follows: on the date represented by day_key 2322, Sue bought five units of whatever product is represented by product_key 10119. One would not ordinarily be studying key values, but the corresponding tables have been omitted to keep the diagram simple. The bottom half of Figure 3-7 shows what the star schema looks like after a type 1 change to Sue s date of birth occurs. The row in the customer dimension table for customer_id 9900011 has been updated; Sue s date of birth is now shown as 3/2/1971. This row is still represented by the surrogate key 1499.
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