IMHO, the more loaded aspect of this inquiry is proposing to do it on HP-UX. Progress has discontinued support for it.
If you have unlimited funds, I'd suggest using them to move to a platform that will be viable in the future.
That aside, I'm not aware of an architectural limit that would prevent a user count that high. Though I'm sure the management of such a system would present challenges that are outside the experience of many OE DBAs.
Definitely no reason not to. Yes there will be a lot of challenges. And I would suggest moving 12.2.2, and as Rob says, a supported OS before heading down that route. I can't vouch for user counts, but I do know there are some massive OE databases in the wild that, presumably, also have impressive user counts.
At that level “concurrent users” are probably remote connections or app servers.
So you probably also should be thinking about OE 12.2.2 (or better) and multi-threaded servers.
I second the motion to get away from HPUX.
The connection count is an interesting metric but you should also probably pay an awful lot of attention to the workload. How many transactions, how many reads, what does that mean in terms of demand on the OS and the hardware? Meeting those demands will almost certainly require a non-cookie cutter approach to things like storage
We are going to re platform to Linux RH next year. We merged with another company, so they hired an outside consultant to decide what ERP is best for the combine company's. I don't have a good vibe. the battle Trend VS Online Informix .