Monitoring process usage

This is a real DBA 101 question...  I have a 9.2 installation that has been 
running without issue for years, and suddenly it has started running out of 
processes every few months.  The first couple of times I misdiagnosed the 
problem, thinking it meant UNIX processes.  This time I dug deeper and realized 
it was actually hitting the PROCESSES limit within Oracle.

I have doubled the value of the PROCESSES initialization parameter, from 250 to 
500.  If the problem is due solely to the website getting busier over time, 
which it has been, then that should fix it.  But I want to keep an eye on 
things to see if there is something running amok (this client does a lot of his 
own programming, and he's not a trained programmer, so it's entirely possible 
that he has created a monster).

So, my question - I have been searching the Google, looking for a script I can 
run periodically to check on how many processes are in use and whether we are 
close to the limit, but I can't find one.  I'm sure I could write one with a 
bit of research, but it seems silly to reinvent the wheel if I don't have to.  
Does anyone have a script or link they could share?

thanks,

janine

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