How many sessions does apex supports?

Greetings !
I had an requirement of creating web portal for a university having round about 100,000 students.
Does apex supports 100,000 sessions or users to create and connecting almost the same time ?

100,000 students won't do a request (leading to a database session) all at exactly the same time - although you will have peak hours.
And APEX doesn't support the sessions, it is your webserver that should handle the number of requests. That's a matter of sizing/parametrizing your server.
And the number of requests can be influenced by the way your APEX pages are build. For instance, a lot of Ajax features leads to more requests...
And your database should be able to handle the number of sessions : a matter of sizing and setting parameters to the right level (and having physical enough memory).
And the number of sessions a database can handle can be influenced by the way your program your SQL and PL/SQL. "Wrong" (as in : bad performing) code will be more noticable when more users execute that shitty piece of code.
FYI : http://campusit.net/ uses APEX for a similar number of students. (Not affiliated in any way with CampusIT)

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