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BI SQL # 200 : SQL Server DBA Scripts : Various SQL Server IO Statistics

Hi Folks,

In this article we are going to cover the Various SQL Server IO Statistics.

In this post we are going to discuss following points:

  • Problem Statement of SQL Script:
  • Description of SQL Script:
  • SQL Script Output Column
  • SQL Script Code
  • SQL Script Output Screenshot
  • User Level to execute

    Problem Statement of SQL Script:

    Find SQL Server IO Statistics

    Description of SQL Script:

    This script will help in maintain and check the drive\disk space and read\write information of current system.

    SQL Script Output Column

    image

SQL Script Code

WITH IOT
AS -- Total sums of all properties. 
    (
    SELECT SUM(IOS.num_of_reads) AS Reads
        ,SUM(IOS.num_of_bytes_read) BytesRead
        ,SUM(IOS.io_stall_read_ms) AS IoStallReadMs
        ,SUM(IOS.num_of_writes) AS Writes
        ,SUM(IOS.num_of_bytes_written) AS BytesWritten
        ,SUM(IOS.io_stall_write_ms) AS IoStallWritesMs
        ,SUM(IOS.io_stall) AS IoStall
        ,SUM(IOS.size_on_disk_bytes) SizeOnDisk
    FROM sys.dm_io_virtual_file_stats(DEFAULT, DEFAULT) AS IOS
    )
    ,IOF
AS (
    SELECT DBS.NAME AS DatabaseName
        ,MF.NAME AS [FileName]
        ,MF.type_desc AS FileType
        ,SUBSTRING(MF.physical_name, 1, 3) AS Drive
        ,CASE 
            WHEN DBS.NAME IN (
                    'master'
                    ,'model'
                    ,'msdb'
                    ,'tempdb'
                    )
                THEN 1
            ELSE 0
            END AS IsSystemDB
        ,IOS.*
    FROM sys.dm_io_virtual_file_stats(DEFAULT, DEFAULT) AS IOS
    INNER JOIN sys.databases AS DBS ON IOS.database_id = DBS.
        database_id
    INNER JOIN sys.master_files AS MF ON IOS.database_id = MF.
        database_id
        AND IOS.file_id = MF.file_id
    )
SELECT IOF.Drive
    ,CONVERT(NUMERIC(5, 2), SUM(100.0 * IOF.num_of_reads / IOT.
            Reads)) AS [Reads%]
    ,CONVERT(NUMERIC(5, 2), SUM(100.0 * IOF.num_of_bytes_read / 
            IOT.BytesRead)) AS [BytesRead%]
    ,CONVERT(NUMERIC(5, 2), SUM(100.0 * IOF.io_stall_read_ms / IOT
            .IoStallReadMs)) AS [IoStallReadMs%]
    ,CONVERT(NUMERIC(5, 2), SUM(100.0 * IOF.num_of_writes / IOT.
            Writes)) AS [Writes%]
    ,CONVERT(NUMERIC(5, 2), SUM(100.0 * IOF.num_of_bytes_written 
            / IOT.BytesWritten)) AS [BytesWritten%]
    ,CONVERT(NUMERIC(5, 2), SUM(100.0 * IOF.io_stall_write_ms / 
            IOT.IoStallWritesMs)) AS [IoStallWritesMs%]
    ,CONVERT(NUMERIC(5, 2), SUM(100.0 * IOF.io_stall / IOT.IoStall
        )) AS [IoStall%]
    ,CONVERT(NUMERIC(5, 2), SUM(100.0 * IOF.size_on_disk_bytes / 
            IOT.SizeOnDisk)) AS [SizeOnDisk%]
FROM IOF
CROSS APPLY IOT
GROUP BY IOF.Drive
ORDER BY IOF.Drive;

SQL Script Output Screenshot

image

User Level to execute

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