Hi, I imagine it's because the smaller set of numbers aren't taking the shared memory segment into account - each process will attach to it and OS tools generally report it. svmon is reporting the segment, v$process isn't. "ipcs -m" will tell you how big the segment is. Cheers, Phil > On 11 Mar 2014, at 05:35, Anton <djeday84@xxxxxxxxx> wrote: > > hi all > faced with heavy swapping, while investigating found huge difference between > oracle and os stats: > v$process says that it use 1.5 gb mem > svmon says that is tis 10gb. > > where such differences come from ? > > > -- //www.freelists.org/webpage/oracle-l