I can answer my own question (or rather Metalink can). The problem looks
like bug 5917099 "V$SQLAREA.USERS_OPENING keeps increasing"
> I can focus my earlier question somewhat. The continuously climbing value
> of sum(250*users_opening) over time is because of a small number of very
> large and increasing values of v$sqlarea.users_opening...
regrets,
Mark
--
http://www.freelists.org/webpage/oracle-l