In order for anyone to offer a valuable response to this or any question or issue, you must provide complete product versions and details about the problem and what you are doing. Exactly which version of Forms are you using? And the same for the Oracle Database, Sql Plus, and the MS Access db.
Also, I would like to know how you "created a database link from oracle forms to ms access"? Can I assume you mean that you create a link between your Oracle database and MS Access?
Please read this: