The Title speaks for itself.
We have this error message on the client side of the application. The devs suspect a problem on the database. The alert log on the database shows no errors at all. The only events I have are the regular archived logs shipping to the standby database.
I was suspecting processes and sessions parameters to be a bit too low, but currently
select count(*) from v$process shows 36 process running. Granted this is not peak time, but I would need to have ora-00020 in my alert log anyway should I hit this threshold...
What else could be happening?