CODEWITHSUNDEEP
sqlsql-serverdatabaseblobdatabase-administration
RisingHerc
RisingHerc

Reputation: 764

How does sp_spaceused calculate the size of tables with BLOB / overflow / out-of-row types?

My requirement is to calculate table sizes in my SQL Server Database.

For this, I am using the predefined SP, sp_spaceused. But, if I have BLOB type columns in my table (like varbinary(max) or FILESTREAM varbinary(max)), how is the size computed?

Can you please help me on this?

Upvotes: 1

Views: 567

Answers (1)

Radim Bača
Radim Bača

Reputation: 10701

I think that your question would be better answered in dba stackexchange. However, I'm using the following SQL command to obtain the table sizes:

SELECT 
    t.NAME AS TableName,
    s.Name AS SchemaName,
    p.rows AS RowCounts,
    SUM(a.total_pages) * 8 AS TotalSpaceKB, 
    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%' AND t.is_ms_shipped = 0 AND i.OBJECT_ID > 255 
GROUP BY t.Name, s.Name, p.Rows
ORDER BY t.Name

It works for the CASE 1, however, I'm unsure about the second case.

Upvotes: 2

Related Questions