Listing 1: Enable Traceflag 1118 to Avoid Using Mixed Extents
USE tempdb
GO
DROP TABLE largerow
GO
DBCC TRACEON(1118)
GO
CREATE TABLE largerow
(a int identity,
b char(8000) default 'No data' )
GO
DECLARE @rows int
SET @rows = 1
WHILE @rows < 9 BEGIN
    INSERT INTO largerow DEFAULT VALUES
    SET @rows = @rows + 1
END
GO
Begin Callout A
DBCC EXTENTINFO(tempdb, largerow, -1)
GO
End Callout A