有网友提问在使用expdp时出现了ORA-39125、ORA-31642错误，具体错误信息如下： 
Connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Starting "EXPALL"."SYS_EXPORT_FULL_04":  expall/******** directory=expdp_dir full=y
dumpfile=exp_tposdb_full.dmp logfile=exp_tposdb_
full.log
Estimate in progress using BLOCKS method...
Processing object type DATABASE_EXPORT/SCHEMA/TABLE/TABLE_DATA
ORA-39125: Worker unexpected fatal error in KUPW$WORKER.GET_TABLE_DATA_OBJECTS while calling
DBMS_METADATA.FETCH_XML_CLOB []
ORA-31642: the following SQL statement fails:
BEGIN "SYS"."DBMS_CDC_EXPDP".SCHEMA_CALLOUT(:1,0,1,'10.02.00.04.00'); END;
ORA-06512: at "SYS.DBMS_SYS_ERROR", line 86
ORA-06512: at "SYS.DBMS_METADATA", line 907
ORA-00942: table or view does not exist
ORA-06512: at "SYS.DBMS_SYS_ERROR", line 95
ORA-06512: at "SYS.KUPW$WORKER", line 6307
----- PL/SQL Call Stack -----
  object      line  object
  handle    number  name
0xa19cbae8     15032  package body SYS.KUPW$WORKER
0xa19cbae8      6372  package body SYS.KUPW$WORKER
0xa19cbae8      9206  package body SYS.KUPW$WORKER
0xa19cbae8      1936  package body SYS.KUPW$WORKER
0xa19cbae8      6944  package body SYS.KUPW$WORKER
0xa19cbae8      1314  package body SYS.KUPW$WORKER
0xa15c0d34         2  anonymous block
Job "EXPALL"."SYS_EXPORT_FULL_04" stopped due to fatal error at 14:06:05
  针对该错误可以参考Mos Note <DataPump Export Utility Fails With Errors ORA-39125 ORA-31642 PLS-201 on Package SYS.DBMS_CDC_EXPDP [ID 825680.1]>和<Export/Import DataPump: The Minimum Requirements to Use Export DataPump and Import DataPump (System Privileges) [ID 351598.1]>， 现引用如下文:   
DataPump Export Utility Fails With Errors ORA-39125 ORA-31642 PLS-201 on Package SYS.DBMS_CDC_EXPDP

Applies to:
Oracle Server - Enterprise Edition - Version: 10.2.0.1 to 10.2.0.4 - Release: 10.2 to 10.2
Information in this document applies to any platform.
Symptoms
You try to export a schema from database using DataPump export utility. This ends with errors:

#> expdp system/password directory=dpu dumpfile=test.dmp schemas=test

Export: Release 10.2.0.4.0 - 64bit Production on Friday, 15 May, 2009 8:49:29

Copyright (c) 2003, 2007, Oracle. All rights reserved.

Connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bitProduction
With the Partitioning, Data Mining and Real Application Testing options
FLASHBACK automatically enabled to preserve database integrity.
Starting "SYSTEM"."SYS_EXPORT_SCHEMA_01": system/******** directory=dpu dumpfile=test.dmp schemas=test
Estimate in progress using BLOCKS method...
Processing object type SCHEMA_EXPORT/TABLE/TABLE_DATA
ORA-39125: Worker unexpected fatal error in KUPW$WORKER.GET_TABLE_DATA_OBJECTS while calling
DBMS_METADATA.FETCH_XML_CLOB []
ORA-31642: the following SQL statement fails:
BEGIN "SYS"."DBMS_CDC_EXPDP".SCHEMA_CALLOUT(:1,0,1,'10.02.00.04.00'); END;
ORA-06512: at "SYS.DBMS_SYS_ERROR", line 86
ORA-06512: at "SYS.DBMS_METADATA", line 907
ORA-06550: line 1, column 7:
PLS-00201: identifier 'SYS.DBMS_CDC_EXPDP' must be declared
ORA-06550: line 1, column 7:
PL/SQL: Statement ignored

ORA-06512: at "SYS.DBMS_SYS_ERROR", line 95
ORA-06512: at "SYS.KUPW$WORKER", line 6307

----- PL/SQL Call Stack -----
object line object
handle number name
0x7e8998d8 15032 package body SYS.KUPW$WORKER
0x7e8998d8 6372 package body SYS.KUPW$WORKER
0x7e8998d8 9206 package body SYS.KUPW$WORKER
0x7e8998d8 1936 package body SYS.KUPW$WORKER
0x7e8998d8 6944 package body SYS.KUPW$WORKER
0x7e8998d8 1314 package body SYS.KUPW$WORKER
0x76337f10 2 anonymous block

Job "SYSTEM"."SYS_EXPORT_SCHEMA_01" stopped due to fatal error at 08:50:02

Cause
These errors are raised, when either the EXECUTE privilege on package SYS.DBMS_CDC_EXPDP was revoked, or,
when the package package SYS.DBMS_CDC_EXPDP was accidentally dropped from data dictionary. Verify this with:

connect / as sysdba

select grantee, privilege
from