Find how many users are connected in the Oracle Server

Hi,
I am using Oracle 10g. My question is, is it possible to find how many users are connected in the Oracle Server. We are having one Server and we are having many client machines which will connect the Oracle.
And one more question in the meanwhile i want to take Backup of one database which client as connected. Is it get any problem to the client machine which is accessing the server. And How to take the backup from the server machine. Any commands to process.
Thank u...!

Hi there.
If You run
select count(*) from v$session where username is not null;you'll get the number of users connected to Oracle server,
and yes , you could do backup while users are connect to db you are backing up.
cheers

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Find how many users are connected in the Oracle Server

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