When your project containing an Index Load component is fully configured you can simulate the incremental load by performing these steps:
Select Run | Noninteractive Trace to run the project noninteractively. All records matching the condition specified by the Load Index Value property are processed.
Simulate the project interactively. Index Load component will not return any records. See “Simulating a project”.
You can manually update the source table between Step 1 and 2 to verify if the correct modified records are retrieved.
To simulate again, right-click the component and select Reset Load Index Value, or enter a new value for the Load Index Value property in the Properties window.