Microsoft SQL Server Error 5030（转）

So, if you are trying to change the collation of a database and getting error 5030, this is much likely because you cannot change the collation of a database when it is in Multi_User mode. In this case, you should try to run the following query.

-- the following line sets the database to "Single User" mode 

ALTER DATABASE DBNAME SET SINGLE_USER WITH ROLLBACK IMMEDIATE

 -- the following line sets the new collation 

ALTER DATABASE DBNAME COLLATE COLLATIONNAME

 -- the following line sets the database back to "Multi User" mode

 ALTER DATABASE DBNAME SET MULTI_USER
原文地址：
http://sunali.com/2009/10/08/microsoft-sql-server-error-5030/