How To Limit The Access To The Database So That Only One User Per Schema Are Connected (One Concurrent User Per Schema)

1. Set in INIT.ORA the parameter

resource_limit = true

and restart Database.

Since Oracle 9iR2 (9.2.0.1) you can perform this without restarting Database

by issuing as SYS:

alter system set resource_limit=true;

2. Connect to Database as SYSTEM or SYS and create the following Profile:

create profile single_user limit sessions_per_user 1;

The other parameters should be adjusted too, but here we discuss only

the session_per_user.

3. Create the user/schema where only one concurrent connection should be allowed

and grant other needed privileges.

create user test1 identified by test1 profile single_user;

grant connect, resource to test1;

4. Test it by trying to connecting with two users “test1”:

Session 1: connect test1/test1 -> Connected

Session 2: Connect test1/test1 ->

ORA-02391: exceeded simultaneous SESSIONS_PER_USER limit