Apt autoupdates

[Suren Karapetyan <surenkarapetyan gmail com>]

Hi there!
Yesterday I was playing with synaptic (so I installed apt, ...)
Today in the morning I received a message from fcron telling that apt 
has successfully upgraded my PC to the latest rawhide (Before it I kept 
old Xorg and Kernel to run Nvidia drivers: yum update --exclude...).
IIRC yum-updatesd isn't configured to update without asking so my 
question is:
Is it desired for apt "CHECK_ONLY=no" in default /etc/sysconfig/apt.

Thanks