IMP-00020: long column too large for column buffer size (number)
What triggered the Error:
The column buffer is too small. This usually occurs when importing LONG data.What should we do to fix it:
Increase the insert buffer size 10,000 bytes at a time (for example). Use this step-by-step approach because a buffer size that is too large may cause a similar problem.
If this was not sufficient go over to:
Oracle Official Support Knowledge Center
Or maybe those geeks at: StackOverflow Board
Or maybe those geeks at: StackOverflow Board