I have create a oracle 9i (9.2) database and set its characterset to
UTF8. After I create a table named man, together with controllers and
scaffold with ruby, I log on to the page "New Man" and input 3 chinese
characters and commit. But the server prompt me that, an ORA-01756 has
happened. Strangely,  if I input 4 chinese or 3 chinese characters
ended up with an English character, it runs well.

Is there anyone met this strange problem? I am looking forward
pressingly to the reply.

Thank you in advance.