Question : Can't Change Length of column from Varchar(50) to Varchar(100)

Hi,

We are using SQL 2005. When trying to change the length of a field one of my users gets this error message.

- Unable to preserve security settings for user 'DOMAIN\jdoe'.  
Incorrect syntax near 'REVERT'. You may need to set the compatibility level of the current database to a higher value to enable this feature. See help for the stored procedure sp_dbcmptlevel.

So I ran the procedure sp_dbcmptlevel and set it to 90, now I get this error:

Unable to preserve security settings for user 'DOMAIN\jdoe'.  
Cannot execute as the database principal because the principal "dbo" does not exist, this type of principal cannot be impersonated, or you do not have permission.

Any ideas?

We recently migrated from SQL 2000 to SQL 2005 if that makes a difference.

-ws

Answer : Can't Change Length of column from Varchar(50) to Varchar(100)

Somewhere you have code that looks like this:

EXECUTE AS LOGIN = 'domain\jdoe'

You got rid of the compatability error because you changed it to 2005.  Now you are having a permission issue in that the account that is trying to run the code does not have Impersonate permissions on the database.