Disk usage per DB per Driveletter pivot

Displays the IO in bytes per database per drive

[table id=3 /]


[sql]
/*
--****************************************************************************************
-- procedure spReportDiskUsagePerDBPerDriveLetter
--****************************************************************************************
-- reports the diskusage per driveletter in a pitvotted form
--****************************************************************************************
-- Versie: 1.0
-- Author: Theo Ekelmans
-- Date: 2010-03-22
--
--****************************************************************************************
IF OBJECT_ID('tempdb..#tmpThEk') IS NOT NULL DROP TABLE #tmpThEk;

create table #tmpThEk (Dname sysname null, DrvName sysname null, RW Bigint null);

With g as
( select db_name(mf.database_id) as database_name,
left(mf.physical_name, 1) as drive_letter,
coalesce(vfs.num_of_bytes_read + vfs.num_of_bytes_written, 0) as BYTES
from sys.master_files mf
inner join sys.dm_io_virtual_file_stats(NULL, NULL) vfs
on mf.database_id=vfs.database_id and mf.file_id=vfs.file_id
where mf.database_id > 4 -- With or withoiut the system DB's
)
insert into #tmpThEk (Dname,DrvName,RW)
select database_name,
drive_letter,
BYTES
-- Percentage = BYTES*100.0/(SELECT SUM(BYTES) FROM g) -- If you so desite you can use overall percentage
from g

-- Find all permutations of DrvName
DECLARE @DrvNames AS TABLE(DrvName sysname NOT NULL PRIMARY KEY)
INSERT INTO @DrvNames SELECT DISTINCT DrvName FROM #tmpThEk


-- Build a dynamic IN clause based on @DrvNames
DECLARE @SelCols AS nvarchar(MAX),
@InCols AS nvarchar(MAX),
@DrvName AS nvarchar(10)
SET @DrvName = (SELECT MIN(DrvName) FROM @DrvNames)
SET @SelCols = N''
SET @InCols = N''
WHILE @DrvName IS NOT NULL
BEGIN
SET @SelCols = @SelCols + N',coalesce(['+@DrvName+N'], 0) as '+@DrvName+N' '
SET @InCols = @InCols + N',['+@DrvName+N']'
SET @DrvName = (SELECT MIN(DrvName) FROM @DrvNames WHERE DrvName > @DrvName)
END
SET @SelCols = SUBSTRING(@SelCols, 2, LEN(@SelCols))
SET @InCols = SUBSTRING(@InCols, 2, LEN(@InCols))

-- Dynamic build of the pivot statement.
DECLARE @sql AS nvarchar(MAX)
SET @sql = N' SELECT Dname, ' + @SelCols + N'
FROM (SELECT Dname, DrvName, RW FROM #tmpThEk) AS D
PIVOT(sum(RW) FOR DrvName IN(' + @InCols + N')) AS P'

-- Show me the good stuff :)
EXEC sp_executesql @sql

[/sql]