mantra,
Avast will auto update both virus database and the program itself if you set it to do so. Right click on the A ball in the tray, and start the AV.
Go to Settings, Update and set both DB and Progam to Auto.
The Ivas Push you are referring to is only in the Avast Pro version.
It is an update directly from Avast when a new virus is found that the Avast team wants users to have protection. So they send it without you asking between Full virus database updates. Think of it as an emergency notification.
OK?