What is the meaning of the “Owner name is NULL. Check the MASTER database is correctly recovered” message?
If you receive either of these messages, the master database might not be in sync with the database you are migrating. SQL Server and Sybase have their own master database which stores all of the security information. This security information, including the ownership of objects, is mapped to the individual databases within SQL Server and Sybase. In order to ensure that this security information is not lost, you must migrate the master database.