In an optimized aggregation, if an account has not changed since the last aggregation, the Virtual Appliance (VA) does not need to connect to the target system to retrieve that account's information again. Optimized aggregation is designed to reduce the load on the system by skipping over accounts that have not been updated, thus preventing unnecessary data retrieval and improving performance.
During optimized aggregation, only accounts or data that have been modified or added since the last aggregation are retrieved. This efficiency is achieved by using timestamps or incremental updates to determine which data needs to be pulled from the target system.
Reference:
SailPoint IdentityNow Aggregation and Optimization Documentation.
SailPoint IdentityNow Virtual Appliance Configuration Guide for Aggregation.