I assume you set this to Daily for troubleshooting purposes only. A full inventory requires a lot of resources from the NS and should only be run monthly. Delta should be run weekly. Periodic inventory will trickle in between this for changes initiated by Altiris such as an Altiris-directed software delivery.
A full inventory is not full in the sense that it gets all data (though it does); a full inventory recreates the inventory by deleting all inventory data and reprocessing every data class. A delta also includes all the data but only processes the differences and is more efficient.
If you continue with a full inventory daily in your environment, you will have serious performance issues on your Notification Server.