Oracle : Ошибка 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.

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