December 2017
Beginner to intermediate
500 pages
12h 10m
English
book
Learning Pentaho Data Integration 8 CE - Third Edition
by Dan Keeley, Diethard Steiner, María Carina Roldán, Miguel Gaspar, Pablo Castagnaro, Paula Clemente, Paulo Alexandre de Oliveira Rodrigues Pires
Content preview from Learning Pentaho Data Integration 8 CE - Third Edition
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Translating the business keys into surrogate keys
No matter the kind of fact table to load, the loading process has much in common for all of them. The source data for the fact table comes from an OLTP system where data contains business keys. In the fact table, you have foreign keys to surrogate keys, the primary keys in the dimension tables. So, before inserting the data into the fact table, for each business key used in your data, you have to find the proper surrogate key. Depending on the kind of dimensions referenced in the fact table, you get the correspondent surrogate keys in a different way.
In the following subsections, we will see how you obtain the surrogate key in each case.
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