Tip

Tablespace usage view

This view allows you to easily see the top 10% by Row Count, Space Used, etc. This is useful for answering the question "what's taking up all the space in my database?" I wrote it when asked to find what table(s) were using all the space in a particular database. Not being familiar with the database I used Enterprise Manager Taskpad-> Tables to find large tables and quickly realized the ability to run a query to find the Top 10 tables by spaced used would be very handy. A quick note on the "Cast(8192 as BigInt)." At first, this seems nonsensical but without it any large table may generate an integer overflow during the multiplication. This tip has been tested specifically on SQL 2000 Developer, Standard, and Enterprise. Should work on all editions and service packs of SQL 2000.

CREATE VIEW vw_SpaceUsed
AS
SELECT 
 OBJECT_NAME(id) AS ObjectName,
 SUM(CASE WHEN indid in (0,1,255) THEN rows ELSE 0 END) AS Rows,
 ((SUM(CASE WHEN indid in (0,1,255) THEN Reserved ELSE 0 END) * Cast(8192 as BigInt)) / 1024) As Reserved,
 ((SUM(CASE WHEN indid in (0,1,255) THEN dpages ELSE 0 END) * Cast(8192 as BigInt)) / 1024) AS Data,
 (((SUM(CASE WHEN indid in (0,1,255) THEN used ELSE 0 END) - SUM(CASE WHEN indid in (0,1,255) THEN dpages ELSE 0 END)) * Cast(8192 as BigInt) ) / 1024) as Index_Size,
 (((SUM(CASE WHEN indid in (0,1,255) THEN Reserved ELSE 0 END) - SUM(CASE WHEN indid in (0,1,255) THEN Used ELSE 0 END))  * Cast(8192 as BigInt)) / 1024) as Unused
FROM
 sysindexes
WHERE
 OBJECTPROPERTY(id,N'IsMSShipped') = 0
GROUP BY 
 OBJECT_NAME(id)

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This was first published in December 2002

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