There are three types of sets in vovserver:
If you define too many smart sets, the effort to recompute them may impact vovserver responsiveness. If possible, keep the number of smart sets under 50 or so.
To learn more about smart sets, run the following command (this is for NC):
% nc cmd vovselect id,name,owner,size,rule from sets where issmart==1
You can also delete them with the following command:
% nc cmd vovset forget set-ID-from-above