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17 Design and ETL 415
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If the source data is provided at a finer grain than is required by the fact table, it must also be aggregated. For each distinct set of natural key values, the individual source transactions are summarized. Care must be taken not to aggregate semi-additive facts improperly; it is assumed nonadditive facts have been broken down into fully additive components in the schema design. In Figure 17-4, aggregation is performed by step 2.4. TIP Fact processing begins by acquiring the source data, transposing it as necessary, computing facts, and aggregating them if needed. Where there are multiple source systems, this process may be repeated for each. Alternatively, the initial extractions may be performed separately, with extracted data consolidated into a single staging area. Subsequent tasks are then performed using this consolidated data set. When there is a single source that is relational, these first four steps may be carried out in a single query. The query selects the relevant natural keys and then aggregates and calculates facts. The next step will be to assign surrogate keys.
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Each transaction from the source system is extracted with natural key values that describe its context. In fact tables, the foreign keys that refer to dimension tables do not contain natural key values. The source values must be replaced by surrogate key values in order to load the record into the fact table. This process is represented by step 2.5 in Figure 17-4. It must be done once for each dimension referred to by the fact table. Identification of the surrogate key values is carried out as a lookup process. The dimension table is searched for a row that contains the natural key value provided by the source system. Once the appropriate dimension record is found, its surrogate key is obtained. Unfortunately, this activity is a bit more complicated than it sounds. For example, suppose you are loading facts into an orders star. One of the dimensions in the star is product. The top portion of Figure 17-6 shows some orders that are being processed to load into the fact table. For each order, you must use the product s natural key to figure out what product_key goes in the fact table. You ll need to do something similar to choose a day_key and customer_key as well. In the source system, each product is identified by its SKU. This natural key was extracted with the transaction data during the first step of the load process. In Figure 17-6, the first record to be processed bears SKU S-8472. In the dimension table, the SKU column is searched for this value. This is represented by arrow A. The value S-8472 is found; the corresponding row is shaded. This row contains product_key 2799. This key is added to the fact record, as represented by arrow B. The same kind of lookup must be performed to obtain a date_key, customer_key, and salesrep_key. This process is complicated by the presence of type 2 slowly changing dimensions. If type 2 changes have occurred in the dimension table, more than one row may be found during the lookup. In the example from Figure 17-6, this happens with the second order transaction to be processed. It bears SKU B-3691, which appears in the product dimension table three times. It will be necessary to figure out which of these three is the correct version for the order in question.
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Part VI
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Orders being processed for FACT load: date 1 2 3/12/2010 3/12/2010 order_ dollars 1,700.22 984.31 margin_ dollars 643.06 201.64 customer_ id 2201 3832 salesrep_ id 1197 1197 sku S-8472 B-3691 product_ key 2799
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A PRODUCT Dimension Table:
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