ORA-39126 ORA-00904 ORA-06512解决过程

expdp test/123456 dumpfile=b.dmp directory=DUMP_DLSP 使用数据汞的过程中遭遇如下错误，从我使用的参数来看，并没有使用什么高

expdp test/123456 dumpfile=b.dmp directory=DUMP_DLSP
使用数据汞的过程中遭遇如下错误，从我使用的参数来看，并没有使用什么高级的参数，都是最最普通的参数。查看MOS，，没发现有跟我比较类似的报错信息。通过10046也没跟踪到有价值的报错信息。

Export: Release 11.2.0.3.0 - Production on Mon Feb 17 14:17:44 2014

Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved.

Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
FLASHBACK automatically enabled to preserve database integrity.
Starting "TEST"."SYS_EXPORT_SCHEMA_08": test/******** dumpfile=b.dmp directory=DUMP_DLSP REUSE_DUMPFILES=y
Estimate in progress using BLOCKS method...
ORA-39126: Worker unexpected fatal error in KUPW$WORKER.FETCH_XML_OBJECTS []
ORA-00904: : invalid identifier

ORA-06512: at "SYS.DBMS_SYS_ERROR", line 86
ORA-06512: at "SYS.KUPW$WORKER", line 8996

----- PL/SQL Call Stack -----
object line object
handle number name
0x613b0898 20462 package body SYS.KUPW$WORKER
0x613b0898 9028 package body SYS.KUPW$WORKER
0x613b0898 10935 package body SYS.KUPW$WORKER
0x613b0898 13698 package body SYS.KUPW$WORKER
0x613b0898 2654 package body SYS.KUPW$WORKER
0x613b0898 9697 package body SYS.KUPW$WORKER
0x613b0898 1775 package body SYS.KUPW$WORKER
0x6145f9f0 2 anonymous block

Estimate in progress using BLOCKS method...
ORA-39126: Worker unexpected fatal error in KUPW$WORKER.FETCH_XML_OBJECTS []
ORA-00904: : invalid identifier

ORA-06512: at "SYS.DBMS_SYS_ERROR", line 86
ORA-06512: at "SYS.KUPW$WORKER", line 8996

----- PL/SQL Call Stack -----
object line object
handle number name
0x613b0898 20462 package body SYS.KUPW$WORKER
0x613b0898 9028 package body SYS.KUPW$WORKER
0x613b0898 10935 package body SYS.KUPW$WORKER
0x613b0898 13698 package body SYS.KUPW$WORKER
0x613b0898 2654 package body SYS.KUPW$WORKER
0x613b0898 9697 package body SYS.KUPW$WORKER
0x613b0898 1775 package body SYS.KUPW$WORKER
0x6145f9f0 2 anonymous block

Job "TEST"."SYS_EXPORT_SCHEMA_08" stopped due to fatal error at 14:17:48

询问同事是否这个数据库一直存在数据汞不能使用的问题，答复一直可以使用，是刚发现的问题。
回想这几天我对这个数据库的操作，怀疑到可能是权限的问题，因为之前做过一个操作，取消了DBMS_METADATA的public权限。
而数据汞导出数据过程中是要获取表结构信息的。
因此尝试重新赋予DBMS_METADATA为public权限，问题解决。

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