expdp报ora-21780。规避措施：expdp在运行时，请不要改变参数值，比如parallel参数值，filesize参数值等等。

Data Pump Export (expdp) or Data Pump Import (impdp) reports ORA-21780 at the end of export completion. (Doc ID 1357811.1)

在该文章中，对触发ora-21780的动作做了一个描述：

Changes

Changed number of parallel processes while Data Pump Export or Import was running.

Export> parallel=1
Export> exit

Solution

FIX

• 11.2.0.4
• 12.1

WORKAROUND

Don‘t change the number of parallel processes while Data Pump Export is running.

References

expdp报ora-21780。规避措施：expdp在运行时，请不要改变参数值，比如parallel参数值，filesize参数值等等。

原文：http://blog.csdn.net/msdnchina/article/details/39251281