Try this out....

Original sql scrip.
SELECT a.dt_tm, b.data_blob from audit_event a, audit_data_blob b WHERE a.evnt_id = b.evnt_id and a.serv_typ_id =5399 and a.dt_tm > sysdate - 1 ORDER BY a.dt_tm

Suggested
SELECT a.dt_tm, b.data_blob

FROM audit_event a, t_data_blob b

WHERE a.serv_typ_id = 5399
AND a.dt_tm > sysdate - 1
AND b.evnt_id = a.evnt_id

ORDER BY a.dt_tm