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用户是否存在:  select   *   from   all_users   where   username   =  '...'
                select   *   from   dba_users   where   username   =  '...'


主机名:   select   host_name   from   v$instance
   
客户机名: select   SYS_CONTEXT('USERENV','HOST')from   dual  
   
主机IP: select   utl_inaddr.get_host_address   from   dual  
   
客户机IP: select   SYS_CONTEXT('USERENV','IP_ADDRESS')   from   dual

转自【http://www.blogjava.net/Xejuny/archive/2008/12/11/245630.html】

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