concurrent session in oracle database

Question

I want to have an application linked to oracle database the users will request data through the app and the app will access the database and retrieve the info. my question is how many concurrent session the system will support?

Answer 1

1 to 2^16 sessions depend on setting in V$RESOURCE_LIMIT where RESOURCE_NAME = 'SESSIONS' . Default setting is depend on number of cpu cores and process limits.

There is also limitation by OS tcp stack. Each tcp connection eating minimum 4096B + 4096B r/w buffer and some data for internal structure. So 1000 connections also mean you need minimum 8MB RAM.

Oracle also reserve some memory for each session. It's called PGA. When you expect thousands sessions you should do some magic tuning :).

Another limitation is Oracle licence. Have a look to V$LICENSE .