ACTIVE_SESSION_HISTORY

SELECT EVENT, A.*
    FROM V$ACTIVE_SESSION_HISTORY A
   WHERE     SAMPLE_TIME BETWEEN TO_DATE ('20160106 120000',
                                          'YYYYMMDD HH24MISS')
                             AND TO_DATE ('20160106 163000',
                                          'YYYYMMDD HH24MISS')
         AND EVENT = 'enq: TX - row lock contention'
ORDER BY SAMPLE_ID DESC;