Hi, The background processes CPU time is accounted separately from DB CPU -> its called "background cpu time" Tanel. On Fri, Sep 25, 2009 at 2:34 AM, Christo Kutrovsky < kutrovsky.oracle@xxxxxxxxx> wrote: > How did you measure CPU usage over the period of time ? > > I can't tell you for sure, but here's a few thinking points. > - dbwriter and other background processes - are these accounted in DB CPU ? > - LMS processes - are these accounted in DB CPU ? > - listener, clusterware, process initialization - those are not accounted > for > > > -- > Christo Kutrovsky > Senior Consultant > The Pythian Group >