Một số lỗi xẩy ra với MSSQL

ERROR: MSDTC on server 'servername' is unavailable.
Vào START > SETTINGS > CONTROL PANEL > ADMINISTRATIVE TOOLS > SERVICES. Start service 'Distributed Transaction Coordinator' .

Saving changes is not permitted. The changes you have made require the following tables to be dropped and re-created. You have either made changes to a table that can't be re-created or enabled the option Prevent saving changes that require the table to be re-created.

Trong Management Studio, vào Tools -> Options / chọn Designer Page và bỏ chọn "Prevent saving changes that require table re-creation".