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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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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】