ORA-01307
        no LogMiner session is currently active
        
        
        Cause
        A select was issued from v$logmnr_contents without first invoking the dbms_logmnr.start_logmnr() procedure. Otherwise, dbms_logmnr.end_logmnr() was called without a prior call to dbms_logmnr.start_logmnr() or dbms_logmnr.add_logfile()
        Action
        Invoke the dbms_logmnr.start_logmnr() procedure before issuing a select from the v$logmnr_contents view.
        
     
    
    
        ORA-01307
        no LogMiner session is currently active
        
        
        Cause
        A select was issued from v$logmnr_contents without first invoking the dbms_logmnr.start_logmnr() procedure. Otherwise, dbms_logmnr.end_logmnr() was called without a prior call to dbms_logmnr.start_logmnr() or dbms_logmnr.add_logfile()
        Action
        Invoke the dbms_logmnr.start_logmnr() procedure before issuing a select from the v$logmnr_contents view.
        
     
    
    
        ORA-01307
        no LogMiner session is currently active
        
        
        Cause
        A select was issued from v$logmnr_contents without first invoking the dbms_logmnr.start_logmnr() procedure. Otherwise, dbms_logmnr.end_logmnr() was called without a prior call to dbms_logmnr.start_logmnr() or dbms_logmnr.add_logfile()
        Action
        Invoke the dbms_logmnr.start_logmnr() procedure before issuing a select from the v$logmnr_contents view.