How to find size of SQL Server database?

[Elliott]

My apologizes for the short question but how can I find out what the size is of SQL Server database?
This would include tables, logs, etc.

[Nimbus]

Try the following -

Query:

SELECT 
      database_name = DB_NAME(database_id)
    , log_size_mb = CAST(SUM(CASE WHEN type_desc = 'LOG' THEN size END) * 8. / 1024 AS DECIMAL(8,2))
    , row_size_mb = CAST(SUM(CASE WHEN type_desc = 'ROWS' THEN size END) * 8. / 1024 AS DECIMAL(8,2))
    , total_size_mb = CAST(SUM(size) * 8. / 1024 AS DECIMAL(8,2))
FROM sys.master_files WITH(NOWAIT)
WHERE database_id = DB_ID() -- for current db 
GROUP BY database_id

Output:

-- my query
name           log_size_mb  row_size_mb   total_size_mb
-------------- ------------ ------------- -------------
0000000000    512.00       302.81        814.81

-- sp_spaceused
database_name    database_size      unallocated space
---------------- ------------------ ------------------
0000000000      814.81 MB          13.04 MB

Function:

ALTER FUNCTION [dbo].[GetDBSize] 
(
    @db_name NVARCHAR(100)
)
RETURNS TABLE
AS
RETURN

  SELECT 
        database_name = DB_NAME(database_id)
      , log_size_mb = CAST(SUM(CASE WHEN type_desc = 'LOG' THEN size END) * 8. / 1024 AS DECIMAL(8,2))
      , row_size_mb = CAST(SUM(CASE WHEN type_desc = 'ROWS' THEN size END) * 8. / 1024 AS DECIMAL(8,2))
      , total_size_mb = CAST(SUM(size) * 8. / 1024 AS DECIMAL(8,2))
  FROM sys.master_files WITH(NOWAIT)
  WHERE database_id = DB_ID(@db_name)
      OR @db_name IS NULL
  GROUP BY database_id

[Connor]

You need to start with the sp_spaceused command.

For example:

sp_spaceused // Returns information about the total size of the database