Largest Tables in a SQL Server Database

Use the query below in any database to identify the largest tables in that database.

SELECT

t.NAME AS TableName,

s.Name AS SchemaName,

(SUM(a.total_pages) * 8)  AS TotalSpaceKB,

(SUM(a.total_pages) * 8) /1024 / 1024 AS TotalSpaceGB,

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%'

GROUP BY t.Name, s.Name

ORDER BY (SUM(a.total_pages) * 8) desc