expdp 導出報ORA-01555: snapshot too old錯誤

ORA-31693: Table data object "APPLSYS"."FND_LOBS" failed to load/unload and is being skipped due to error:
ORA-02354: error in exporting/importing data
ORA-01555: snapshot too old: rollback segment number 154 with name "_SYSSMU154_1434655980$" too small

SQL> show parameter undo;

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
undo_management                      string      AUTO
undo_retention                       integer     900
undo_tablespace                      string      UNDOTBS1


SQL> select max(maxquerylen) from v$undostat;

MAX(MAXQUERYLEN)
----------------
16331

SQL> select retention from dba_lobs where owner='APPLSYS' and table_name='FND_LOBS';

RETENTION
----------
900

1. Modify the current UNDO_RETENTION for the database:
SQL>ALTER SYSTEM SET UNDO_RETENTION = 16500 scope=both sid='*';

2. Modify the LOB retention to become greater than the undersized retention parameter following the steps from Note:563470.1
SQL> alter table APPLSYS.FND_LOBS modify lob(FILE_DATA) (pctversion 5);
Table altered.

SQL> alter table APPLSYS.FND_LOBS modify lob(FILE_DATA) (retention);
Table altered.

3.  Query the lob retention again to verify that the change has taken hold:
SQL> select retention from dba_lobs where owner='APPLSYS' and table_name='FND_LOBS';

RETENTION
----------
16500