All Oracle Error CodesOracle DBA Forum

ORA-03127:

no new operations allowed until the active operation ends
Cause: An attempt was made to execute a new operation before the active non-blocking operation completed or a new operation was attempted before all the pieces of a column were inserted or fetched.
Action: Execute the new operation after the non-blocking operation completes. If piecewise binds/defines were done, execute the new operation after all the pieces have been inserted or fetched.