O select abaixo exibe uma listagem de todas todas as tabelas de um banco, com a quantidade de registros e tamanho de cada uma.
SELECT
t.NAME AS TableName,
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
WHERE
t.NAME NOT LIKE 'dt%'
AND t.is_ms_shipped = 0
AND i.OBJECT_ID > 255
GROUP BY
t.Name, p.Rows
ORDER BY
t.Name
