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sql server 2005 alter autorization diagram

sql server 2005 alter authorization
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sk_raja_rajaCommented:
To install database diagram support in SQL Server Management Studio, databases must be in SQL Server 2005 database compatibility level. Database compatibility level can be reset after diagram support is installed. If the databases are not in 2005 compatibility level, the following error occurs when you attempt to install diagram support:

Database diagram support objects cannot be installed because this database does not have a valid owner. To continue, first use the Files page of the Database Properties dialog box or the ALTER AUTHORIZATION statement to set the database owner to a valid login, then add the database diagram support objects.

To create database diagrams, change the database compatibility level to 2005, install database diagram support, and then return the database to the desired database compatibility level. For more information, search for "sp_dbcmptlevel" in SQL Server Books Online.

Installation of Database Diagram Support Objects Requires a Valid Logon Account

In SQL Server 2005, database diagram support objects will be installed on a database if a member of the db_owner fixed database role performs one of the following operations:
•      Expands the Database Diagrams folder      
•      Creates a new diagram      
•      Explicitly chooses to install the objects from the context menu      
The installation of these support objects can fail on a database that has been attached or restored from another instance of SQL Server. This can occur when the database owner name (stored in the database) is not a valid logon for the instance of SQL Server that the database is being attached or restored to. Use the following Transact-SQL expression to change the database owner to a valid logon for the instance of SQL Server. Then, retry the database diagram operation.

ALTER AUTHORIZATION ON DATABASE::database_name TO valid_login
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