Tutorials on the basic concepts and theories behind ETL (Extraction, Transformation and Loading) technology.
"We have a simple data warehouse that takes data from a few RDBMS source systems and load the data in dimension and fact tables of the warehouse. I wonder why we have a staging layer in between. Why can’t we process everything on the fly and push them in the data warehouse?"
In the previous articles, we have discussed the general concepts of incremental data loading as well as how to perform incremental data loading for dimension tables. In this article we will discuss the methods and issues of loading data incrementally in Fact tables of a data warehouse.
Incremental loading a.k.a Delta loading is an widely used method to load data in data warehouses from the respective source systems. This technique is employed to perform faster load in less time utilizing less system resources. In this tutorial we will understand the basic methods of incremental loading.
In our previous article we have discussed the concept of incremental loading in general. In this article we will see how to perform incremental loading for dimension tables.
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