I had the opportunity to test TableDifference (a component written by Alberto Ferrari) since early versions and I can say it is a very interesting way to handle Slowly Changing Dimension (SCD) much faster than with the standard SCD component of SSIS.

While you work with dimensions with millions of members and you don’t have a “LastModified” field to filter variations since last dimension processing, the need to compare the whole dimension with an equally wide table force you to implement custom solutions. TableDifference is a general purpose component that helps you to implement fast SCD processing in a more standardized way.

TableDifference is well described in this article and you can download source code and binaries here.