# Delta Aggregation The SuccessFactors SaaS connector supports delta aggregation for accounts. Delta aggregation aggregates new accounts or accounts that have changed since the last aggregation. For more information, refer to [Configuring Delta Aggregations for Supported Sources](). - In delta aggregation, any attribute changes that come under the effective-dated entities of Employees or Users with Employment are aggregated. - The delta for SuccessFactors gets populated based on the `last_modified_on` field, which is used in SuccessFactors Employee Central - Compound Employee API. The delta aggregation can capture a delta max for the last 90 days. This means that any data change done prior to 90 days of the last successful account aggregation timestamp are not captured and a full account aggregation is required. - The connector fetches only the attributes included in `querymode=delta` from the Compound Employee API. - If there is any change in the configuration of the application, run a full account aggregation before running delta aggregation.