Cannot use special principal dbo Error 15405

Question

I am trying to give all the permissions to a user in the User Mapping section of a database  But  I am encountering this error    Cannot use special principal dbo    Server roles of the user

User · Accepted Answer

This is happening because the user  sarin  is the actual owner of the database  dbemployee  - as such  they can only have db owner  and cannot be assigned any further database roles   Nor do they need to be  If they re the DB owner  they already have permission to do anything they want to within this database    To see the owner of the database  open the properties of the database  The Owner is listed on the general tab    To change the owner of the database  you can use sp changedbowner or ALTER AUTHORIZATION  the latter being apparently the preferred way for future development  but since this kind of thing tends to be a one off

User · Answer

Fix  Cannot use the special principal    sa     Microsoft SQL Server  Error  15405   When importing a database in your SQL instance you would find yourself with Cannot use the special principal  sa   Microsoft SQL Server  Error  15405 popping out when setting the sa user as the DBO of the database  To fix this  Open SQL Management Studio and Click New Query  Type   USE mydatabase exec sp changedbowner  sa    true    Close the new query and after viewing the security of the sa  you will find that that sa is the DBO of the database   14444   Source  http   www noelpulis com fix-cannot-use-the-special-principal-sa-microsoft-sql-server-error-15405

User · Answer

To fix this  open the SQL Server Management Studio and click New Query  Then type   USE mydatabase exec sp changedbowner  sa    true

User · Answer

This answer doesn t help for SQL databases where SharePoint is connected  db securityadmin is required for the configuration databases  In order to add db securityadmin  you will need to change the owner of the database to an administrative account  You can use that account just for dbo roles

[sql-server] Cannot use special principal dbo: Error 15405

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