Generate a Change Script to Move System Databases

I set this up to be modular and reusable, because I like reusing things.  This doesn’t actually move your system databases.  It just outputs a change script and a revert script.  You still have to run the generated script, then log on to your server and stop the services and move the files yourself.  In my example, I’m moving TempDB from C (ew) onto better storage.
declare @dbname sysname,
@oldpath varchar(255),
@newpath varchar(255)

set @dbname='tempdb'
set @oldpath='C:\Program Files\Microsoft SQL Server\MSSQLSERVER\MSSQL\DATA' --no trailing slash
set @newpath='H:\HappyStorage' --no trailing slash

/*  Generates your change script */
SELECT 'alter database ' + @dbname + ' modify file (name=' + name + ', filename = ''' + replace(physical_name,@oldpath,@newpath) + ''');'
FROM sys.master_files
WHERE database_id = DB_ID(@dbname);

/* Generates a revert script */
SELECT 'alter database ' + @dbname + ' modify file (name=' + name + ', filename = ''' + physical_name + ''');'
FROM sys.master_files
WHERE database_id = DB_ID(@dbname);

/* Tells you where the files are now */
SELECT name, physical_name
FROM sys.master_files
WHERE database_id = DB_ID(@dbname);
GO

Sample output would  include, in the top window:

alter database tempdb modify file (name=tempdev, filename = 'H:\HappyStorage\Data\tempdb.mdf');
alter database tempdb modify file (name=templog, filename = 'H:\HappyStorage\Log\templog.ldf');

Copy and paste that into a new window, and run it if you’re sure it’s right.

You can, of course, use this for MSDB or any other database you want to move.

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