exec sp_msforeachdb 
'use [?]; 
SELECT ''?'', MAX(TotalSpaceMB) as MaxObjSizeMB
FROM (
SELECT 
    t.NAME AS TableName,
    i.name as indexName,
    (sum(a.total_pages) * 8) / 1024 as TotalSpaceMB
FROM 
    sys.tables t
INNER JOIN      
    sys.indexes i ON t.OBJECT_ID = i.object_id
INNER JOIN 
    sys.partitions p ON i.object_id = p.OBJECT_ID AND i.index_id = p.index_id
INNER JOIN 
    sys.allocation_units a ON p.partition_id = a.container_id
WHERE 
    t.NAME NOT LIKE ''dt%'' AND
    i.OBJECT_ID > 255 AND   
    i.index_id <= 1
GROUP BY 
    t.NAME, i.object_id, i.index_id, i.name ) as Tab'