In this post, I am sharing a simple use of sp_spaceused system stored procedure of SQL Server.

Most of the SQL Server professional already knew about this system stored procedure, but I am going to tell about the @updateusage parameter of sp_spaceused.

Sometimes, sp_spaceused is not giving updated/accurate space information of database/objects. In that case, we have to use sp_spaceused with @updateusage parameter.

The @updateusage parameter will ensure that returned value is updated and accurate.

Check the space information of a database:

sp_spaceused 
@updateusage = 'TRUE'

Check the space information of a table:
It will also return the space information of table indexes.

sp_spaceused 
@objname = 'table_name' 
,@updateusage = 'TRUE'

In this post, I am sharing different scripts on how to find row count, occupied space, free space, page and extent information of the SQL Server Tables.

The first step for performance optimization is to measure the size of tables with different information like a number of pages and extents, row size, free space.

Below are different scripts for finding the table related information.

Using DBCC SHOWCONTG, find average row size, page and extent information:

DBCC SHOWCONTIG ('Table_Name') WITH tableresults
GO

Using sp_spaceused, find row count, index size, data size, unused space:

sp_spaceused 'Table_Name'
GO

T-SQL Script for all tables:

SELECT 
	O.name AS TableName
	,P.rows AS TotalRows
	,SUM(AU.used_pages)*8 AS SizeInKB
FROM sys.objects AS O
JOIN sys.indexes AS I 
	ON O.object_id = I.object_id
JOIN sys.partitions AS P 
	ON O.object_id = P.object_id
JOIN sys.allocation_units AS AU 
	ON AU.container_id = P.partition_id
WHERE O.type = 'U' 
	AND I.index_id IN (0,1)
GROUP BY O.name, P.rows
ORDER BY 3 DESC