Oracle how do i see who connected to my database I am using oracle 11g and I would like to see who connected to my database some hours ago. In what file can I see those who have connected to my database through a network connection?

Thanks
you need auditing in your database, by default Oracle database audit LOGON/LOGOFF action, please take a look into following article Auditing in Oracle 10g Release 2. query from DBA_AUDIT_TRAIL is a good starting point