How to know which Oracle version database I am using ?

Question

Hi all,
I am configuring an administrative file on the server and there are many databases in our company : there are Oracle8i, Oracle9i and Oracle 10g databases.
What I know only is the connect string which I use to connect to a database via Sql*Plus. But I do not know if it is in 8i or 9i or 10g.
So can you help me how to know the database version which I am using ?
Thank you very much indeed.

Answer 1

To be clear I tell you my big problem : I am developing a forms application. There is a specification in my project telling that if the end-user does nothing during a periode of time which can be set by an administrative user , say 3 minutes , then the end-user session is disconnected. So how to implement this ?
I tried to use profile and the sqlnet.expire_time but it is too long greater than the set time-limit !
So what is the best way to implement this functionality ?
Note that in my forms application, I wrote a query on the dba_profiles view to get the value of the column limit for the resource_name idle_time. All users , that is the "public" keyword , have been granted select on dba_profiles by sys , and this value of the limit column is the time-limit I used in my forms. When the forms application is run then there is a timer created which periodically tests connection to the database by issuing a simple select statement. The periodicity of the timer is set to the value of the limit column in dba_profiles plus one minute because I set sqlnet.expire_time to 1 minute. When the disconnection arrives then there should be a message displayed to the end-user saying that he cannot do anything because his session has been stoped.
I think I was clear and I am waiting for a good advice from all of you.
Thank you very much indeed.