trace the expdp log（跟踪EXPDP日志）

Can you confirm if the same data was exported quickly before? If so can we know the time difference?

Perform the following and provide the trace files generated:

Ensure there is sufficient space in the udump destination.
Execute the export session.
The following query will give us the sid, serial# and pid of the export session:

set lines 150 pages 100 numwidth 7
col program for a38
col username for a10
col spid for a7
SQL>select s.program, s.sid,
s.status, s.username, d.job_name, p.spid, s.serial#, p.pid
from v$session s, v$process p, dba_datapump_sessions d
where p.addr=s.paddr and s.saddr=d.saddr;

To SQL_TRACE Master Control process with level 8 (Waits):
execute sys.dbms_system.set_ev(sid,serial#,10046,8,''); ---------> enter the export session sid, serial# from the above query. Do this for both the master process and the worker process.
Wait for 20 mins and then disable the trace
To disable:
execute sys.dbms_system.set_ev(sid,serial#,10046,0,'');

-- This results in two trace files in BACKGROUND_DUMP_DEST:
-- Master Process trace file: <SID>_dm<number>_<process_id>.trc
-- Worker Process trace file: <SID>_dw<number>_<process_id>.trc