Below is a query to find out the Top 10 tables in a database by the amount of space used
SELECT TOP 10
a3.name AS SchemaName,
a2.name AS TableName,
a1.rows as Row_Count,
(a1.reserved )* 8.0 / 1024 AS reserved_mb,
a1.data * 8.0 / 1024 AS data_mb,
(CASE WHEN (a1.used ) > a1.data THEN (a1.used ) - a1.data ELSE 0 END) * 8.0 / 1024 AS index_size_mb,
(CASE WHEN (a1.reserved ) > a1.used THEN (a1.reserved ) - a1.used ELSE 0 END) * 8.0 / 1024 AS unused_mb
FROM ( SELECT
ps.object_id,
SUM ( CASE WHEN (ps.index_id < 2) THEN row_count ELSE 0 END ) AS [rows],
SUM (ps.reserved_page_count) AS reserved,
SUM (CASE WHEN (ps.index_id < 2) THEN (ps.in_row_data_page_count + ps.lob_used_page_count + ps.row_overflow_used_page_count)
ELSE (ps.lob_used_page_count + ps.row_overflow_used_page_count) END
) AS data,
SUM (ps.used_page_count) AS used
FROM sys.dm_db_partition_stats ps
GROUP BY ps.object_id
) AS a1
INNER JOIN sys.all_objects a2 ON ( a1.object_id = a2.object_id )
INNER JOIN sys.schemas a3 ON (a2.schema_id = a3.schema_id)
WHERE a2.type <> N'S' and a2.type <> N'IT'
order by a1.data desc
SELECT TOP 10
a3.name AS SchemaName,
a2.name AS TableName,
a1.rows as Row_Count,
(a1.reserved )* 8.0 / 1024 AS reserved_mb,
a1.data * 8.0 / 1024 AS data_mb,
(CASE WHEN (a1.used ) > a1.data THEN (a1.used ) - a1.data ELSE 0 END) * 8.0 / 1024 AS index_size_mb,
(CASE WHEN (a1.reserved ) > a1.used THEN (a1.reserved ) - a1.used ELSE 0 END) * 8.0 / 1024 AS unused_mb
FROM ( SELECT
ps.object_id,
SUM ( CASE WHEN (ps.index_id < 2) THEN row_count ELSE 0 END ) AS [rows],
SUM (ps.reserved_page_count) AS reserved,
SUM (CASE WHEN (ps.index_id < 2) THEN (ps.in_row_data_page_count + ps.lob_used_page_count + ps.row_overflow_used_page_count)
ELSE (ps.lob_used_page_count + ps.row_overflow_used_page_count) END
) AS data,
SUM (ps.used_page_count) AS used
FROM sys.dm_db_partition_stats ps
GROUP BY ps.object_id
) AS a1
INNER JOIN sys.all_objects a2 ON ( a1.object_id = a2.object_id )
INNER JOIN sys.schemas a3 ON (a2.schema_id = a3.schema_id)
WHERE a2.type <> N'S' and a2.type <> N'IT'
order by a1.data desc