IDS 7.2x: open sessions without clients?

Hi, Sometimes we are getting performance problems after about 3 to 4 days system up time. We have found that in that case there are a lot of informix session open (onstat -u) but it seems that the clients have died (i.e. the number of sessions is far more than the number of working PC's or users connected to the host system). Does anyone have an idea how to determine (preferably by a script) if the connection between the informix user session and the client still exists (the client is still alive) ? Best regards -- Helmut Leininger Bull AG / Vienna Unix Support Email: Helmut.Leininger@bull.net This opinion is mine and not necessarily that of my employer. No guarantees whatsoever.