After migration to Plesk 12, the access rights to databases have changed: a newly created user does not have
db_owner role enabled.
Since Plesk version 12 MSSQL users created through Plesk interface are not provided with
db_owner role for security reasons.
Use either of the following methods to resolve the issue:
Go to Tools & Settings > Database Servers > Settings and enable
Grant the ALTER DATABASE permission to all Microsoft SQL Server database usersoption.
%plesk_dir%\bin\server_pref.exe --update -grant-alter-database-to-mssql-users true
Note: to fix permissions and roles of all MS SQL users, run the following command: