Table and Index size in SQL Server

Question

Can we have a SQL query which will basically help in viewing table and index sizes in SQl Server.

How SQL server maintains memory usage for tables/indexes?

Answer 1

it’s being a long time since the creation for this post but I wanted to share my script:

WITH CteIndex
AS
(
SELECT 
     reservedpages = (reserved_page_count)
     ,usedpages = (used_page_count)
     ,pages = (
            CASE
                WHEN (s.index_id < 2) THEN (in_row_data_page_count + lob_used_page_count + row_overflow_used_page_count)
                ELSE lob_used_page_count + row_overflow_used_page_count
            END
            )    
     ,s.object_id   
     ,i.index_id        
     ,i.type_desc AS IndexType
     ,i.name AS indexname
    FROM sys.dm_db_partition_stats s
    INNER JOIN sys.indexes i ON s.[object_id] = i.[object_id] AND s.index_id = i.index_id   
)
SELECT DISTINCT
DB_NAME(DB_ID()) AS DatabaseName
,o.name AS TableName
,o.object_id
,ct.indexname
,ct.IndexType
,ct.index_id
, IndexSpace = LTRIM (STR ((CASE WHEN usedpages > pages THEN CASE WHEN ct.index_id < 2 THEN  pages ELSE (usedpages - pages) END ELSE 0 END) * 8, 15, 0) + ' KB')
FROM CteIndex ct
INNER JOIN sys.objects o ON o.object_id = ct.object_id
INNER JOIN sys.dm_db_index_physical_stats (DB_ID(), NULL, NULL, NULL , NULL) ps ON ps.object_id = o.object_id
AND ps.index_id = ct.index_id
ORDER BY name ASC

it works for :

• SQL Server (starting with 2008)
• Includes info for all tables per current database

Answer 2

There is an extended stored procedure sp_spaceused that gets this information out. It's fairly convoluted to do it from the data dictionary, but This link fans out to a script that does it. This stackoverflow question has some fan-out to information on the underlying data structures that you can use to construct estimates of table and index sizes for capcity planning.

Answer 3

This query comes from two other answers:

Get size of all tables in database

How to find largest objects in a SQL Server database?

, but I enhanced this to be universal. It uses sys.objects dictionary:

SELECT 
    s.NAME as SCHEMA_NAME,
    t.NAME AS OBJ_NAME,
    t.type_desc as OBJ_TYPE,
    i.name as indexName,
    sum(p.rows) as RowCounts,
    sum(a.total_pages) as TotalPages, 
    sum(a.used_pages) as UsedPages, 
    sum(a.data_pages) as DataPages,
    (sum(a.total_pages) * 8) / 1024 as TotalSpaceMB, 
    (sum(a.used_pages) * 8) / 1024 as UsedSpaceMB, 
    (sum(a.data_pages) * 8) / 1024 as DataSpaceMB
FROM 
    sys.objects t
INNER JOIN
    sys.schemas s ON t.SCHEMA_ID = s.SCHEMA_ID 
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 
    s.NAME, t.NAME, t.type_desc, i.object_id, i.index_id, i.name 
ORDER BY
    sum(a.total_pages) DESC
;