Oracle Error Codes

user string lacks CREATE SESSION privilege in database link (linkname string)

There are several possible causes for this message: First, you will get this message if your username in the second database specified was not granted the CREATE SESSION system privilege. Second, you will get this message if the username specified in the connect string of the database link definition was not granted the CREATE SESSION system privilege.

How to Solve :

The action you take depends upon the cause of the message: In the first case, ensure that your username in the secondary database was granted the CREATE SESSION system privilege. In the second case, ensure the username specified in the connect string of the database link definition was granted the CREATE SESSION system privilege in the secondary database.