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select t.OSUSER,t.STATUS,t.LOGON_TIME from v$session t
select t.OSUSER,t.STATUS,t.LOGON_TIME from v$session t where t.OSUSER='admin'
select t.OSUSER,t.STATUS,t.LOGON_TIME from v$session t where t.OSUSER='liuzhaoqing'
select t.OSUSER,t.STATUS,t.LOGON_TIME from v$session t where t.OSUSER='ymx'
select t.OSUSER,t.STATUS,t.LOGON_TIME from v$session t where t.OSUSER='DFL'


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#pragma warning(disable:4146)
#import "C:\Program Files\Common Files\System\ADO\msado15.dll"
named_guids rename("EOF","adoEOF"), rename("BOF","adoBOF")
#pragma warning(default:4146)
using namespace ADODB;
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     [DataBase] [Export] [GenerateSchmaScript]
2¡¢´´½¨DBLink.
     DROP PUBLIC DATABASE LINK "ROOT.US.ORACLE.COM";
     CREATE PUBLIC DATABASE LINK "ROOT.US.ORACLE.COM"
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