SCD Type 2, is design to generate new records for every change of a dimension attribute, so that complete historical changes can be tracked correctly. When we have dimension attributes which changes very frequently, the dimension grow very rapidly causing considerable performance and maintenance issues. In this article lets see how we can handle this rapidly changing dimension issue using SCD Type 4.
In one of our prior articles we described the SCD Type 6 dimensional modeling technique. This technique is the combination of SCD Type1, Type 2 and Type 3, which gives much more flexibility in terms of the number of queries it can answer. But off course at the cost of complexity. In this article lets discuss the step by step implementation of SCD Type 6 using Informatica PowerCenter.
In a matured data warehouse environment, it is very common to see fact tables with dozens of dimension tables linked to it. If we are using informatica to build this ETL process, we would expect to see dozens of lookup transformations as well; unless any other design techniques are used. Since lookup is the predominant transformation, turning this will help us gain some performance. Lets see how we can use persistent lookup cache for this performance improvement.
Johnson Cyriac Apr 7, 2013
The Informatica PowerCenter Workflow Manager contains many types of tasks to help you build workflows and worklets. You can create reusable tasks in the Task Developer. Or, create and add tasks in the Workflow or Worklet Designer as you develop the workflow. In this article lets see very commonly used Tasks for Workflow or Worklet development.