export导出遇到ORA-19206 EXP-56 While Taking Export

Applies to: 

Oracle Database - Enterprise Edition - Version 9.2.0.1 to 9.2.0.8 [Release 9.2]
Information in this document applies to any platform.
***Checked for relevance on 11-Apr-2013***

Symptoms

During export you receive the following errors:

EXP-00056: ORACLE error 19206 encountered
ORA-19206: Invalid value for query or REF CURSOR parameter
ORA-06512: at "SYS.DBMS_XMLGEN", line 83
ORA-06512: at "SYS.DBMS_METADATA", line 345
ORA-06512: at "SYS.DBMS_METADATA", line 410
ORA-06512: at "SYS.DBMS_METADATA", line 449
ORA-06512: at "SYS.DBMS_METADATA", line 1156
ORA-06512: at "SYS.DBMS_METADATA", line 1141
ORA-06512: at line 1
EXP-00056: ORACLE error 19206 encountered
EXP-00000: Export terminated unsuccessfully

Also the error ORA-600 [qmxtrGetInputOpn1] may occur.

Cause

XDB installation/dictionary built causes some of the underlying XML views to be INVALID. The error occurs when dbms_xmlgen tries to access one those invalid views.

Solution

- Upgrade to 10g where the issue is fixed.

Or:

- Remove XDB component, if you are not using it. The steps are described in:

Note 1292089.1 - Master Note for Oracle XML Database (XDB) Install / Deinstall

Note:  A possible workaround is turning off query rewrite for XML operators by setting the following event:

SQL> alter system set events '19027 trace name context forever, level 1';

To disable the event at any time

SQL> alter system set events '19027 trace name context off';