Oracle数据库exp导出数据时出现以下错误，怎么解决？

Question

出错的表包含clob字段，但是其它有clob字段的表也有导出成功的

Answer 1

Problem Explanation:  
====================  
This can be caused by running the script 'catnoqueue.sql' without first dropping all the queue tables in the database.  
  
Solution Explanation  
====================  
The script 'catnoqueue.sql' has been run which drops the tables DEF$AQCALL and DEF$AQERROR. The corresponding rows in SYS.EXPACT$ are not dropped. Prior to running 'catnoqueue.sql', check for and drop any existing queue tables. To ascertain the existence of any queue tables, from SQL*Plus issue the following command to list all queue tables:  
  
SELECT * FROM dba_queue_tables  
  
To drop the queue tables, from SQL*Plus issue the following command: execute dbms_aqadm.drop_queue_table('<queue table name>')  
  
Solution Description:  
=====================  
If 'catnoqueue.sql' has already been run, then you need to delete from SYS.EXPACT$ rows for non-existent queue tables. The following steps will allow a full export to run successfully:  
  
All rows from the SYS.EXPACT$ table for the function package DBMS_AQ_IMPORT_INTERNAL need to be deleted.  
  
1. Login into Server Manager as INTERNAL or SYS; or, login into SQL*Plus as SYS  
  
2. Enter the following SQL command:  
  
DELETE FROM SYS.EXPACT$  
WHERE FUNC_PACKAGE = 'DBMS_AQ_IMPORT_INTERNAL';  
  
After the statement issue a 'commit' so the statement can take effect.  
  
3. Exit Server Manager or SQL*Plus.  
4. Now you should be able to do a full database export.