How to define table size in MS SQL database

Preamble

To determine the size of tables in a database hosted on Microsoft SQL Server, you need to perform the following steps:

1. Connect to a database server using SQL Server Management Studio (SSMS)
2. Select a database whose table size you want to define
3. Execute SQL query:

USE {database_name};
GO

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;
GO

where:

• database_name – the name of the database, for which it is necessary to get the list of tables with sizes.

The size of the database tables will be specified by Kilobytes.

If you need to get a limited list of tables, for example, containing certain words in the name, you can shorten the output by adding a condition (t.Name Like ‘%Filter%’) to the WHERE construct

WHERE
t.Name NOT LIKE 'dt%'
AND t.Name Like '%Filter%'
AND t.is_ms_shipped = 0
AND i.object_id > 255

where:

• Filter – is a substring in the table name.

Another way to get the size of tables in the database is to use the built-in stored sp_spaceused procedure.

The stored procedure sp_spaceused outputs the number of rows, disk space reserved and disk space used by the table, indexed view or queue of the Service Broker component in the current database, or outputs disk space reserved and used by the entire database.

The following example provides disk space information for the table_name and its indexes in the database_name database using the stored sp_spaceused procedure:

USE {database_name};
GO
EXEC sp_spaceused N'{dbo}.{table_name}';
GO

The example below shows the disk space for all tables and their indexes in database_name.

USE {database_name};
GO
sp_msforeachtable N'EXEC sp_spaceused [?]';
GO

Determine the disk space used by the indexes

To find out how much space the database table indexes take, you can use the following query:

USE {database_name};
GO

SELECT
OBJECT_NAME(i.object_id) AS TableName,
i.name AS IndexName,
i.index_id AS IndexID,
8 * SUM(a.used_pages) AS 'Indexsize(KB)'
FROM
sys.indexes AS i
JOIN sys.partitions AS p ON p.object_id = i.object_id AND p.index_id = i.index_id
JOIN sys.allocation_units AS a ON a.container_id = p.partition_id
GROUP BY
i.OBJECT_ID, i.index_id, i.name
ORDER BY
OBJECT_NAME(i.object_id),
i.index_id

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