Just how big ARE those tables?

If you need to know the size of all your tables, here’s a simple query to get you where you need to go:

SELECT t.NAME AS TableName,
s.Name AS SchemaName,
p.rows AS RowCounts,
SUM(a.total_pages) * 8 AS TotalSpaceKB,
SUM(a.used_pages) * 8 AS UsedSpaceKB,
(SUM(a.total_pages) - SUM(a.used_pages)) * 8 AS UnusedSpaceKB
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)
LEFT OUTER JOIN sys.schemas s ON (t.schema_id = s.schema_id)
WHERE t.NAME NOT LIKE 'dt%'
AND t.is_ms_shipped = 0
AND i.OBJECT_ID > 255
GROUP BY t.Name, s.Name, p.Rows
ORDER BY UsedSpaceKB desc