Create a dynamic entity (with only a few hundred rows of records) to act as a connection to your data source. Next, create and run entity business rules against them. Use the dynamic entities as input to a Quality project to standardize and cleanse the sample data.
The dynamic entity in the project acts like a template of the data source, allowing you to test your project more efficiently. After you have finished testing and confirmed that the project matches your requirements, load the full data and run the project.