To perform data subset, masking, and discovery operations, you must import source metadata into the TDM repository. You can import sources from the Model repository or from a source database.
When you create a project, add one or more sources to the project. You can add more than one type of source to the project. For example, you can add a flat file source and a relational source to the project. You can create constraints to create relationships between the sources and apply filter criteria for data subset and data masking.
If the source data has a numeric column with precision greater than 28, you cannot apply a data masking or data subset condition to that column. The
Data Integration Service
passes the row and the column to the target without applying the condition.