Running a subsetting treatment
Published 27 November 2025
Prerequisites
- You've created and configured your treatment
- Chosen desired size OR starting tables approach
- Creating a subsetting treatment
Running a Subsetting Treatment
Step 1: Start the Treatment
- Click Run Subset in the top-right corner
- The "Run treatment" panel appears
Step 2: Configure Source and Target Databases
Source database: The database to extract data from
- Select an existing connection from the dropdown, OR
- Click + Add connection to create a new one
Target database: The database to copy the subset to
- Select an existing connection from the dropdown, OR
- Click + Add connection to create a new one
Target database requirements:
- Must have the same schema as the source database
- Will be cleared before subsetting (existing data is removed)
- Must be a non-production database
Subsetting modifies the source and target database: The treatment will clear existing data and copy the subset to the target. Make sure you're connecting to a non-production database you're prepared to overwrite.
Step 3: Configure Options
- Ignore additional objects in target database: Check this option if your target database contains objects that are not present in the source database (for example, Oracle public synonyms or tables from other schemas). When enabled, subsetting will proceed and only operate on the matching objects, rather than failing due to the mismatch.
Step 4: Run the Treatment
- Review the source and target connection details
- Click Run
- Monitor progress
What happens during execution
- TDM extracts data from source
- Clears target database
- Copies subset to target
- Maintains referential integrity
Related pages
← Back to Configuring desired size / starting tables
→ Download treatment for CLI use
→ Subsetting troubleshooting
