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BI SQL # 266 : SQL Server DBA Scripts : Find Cumulative IO Stats

Hi Folks,

In this article we are going to cover How to Find Cumulative IO Stats.

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:

How to Find Cumulative IO Stats?

Description of SQL Script:

This script will show the amount of IO that has been done for each database file. As well as this it will show the read/write work load split as well as showing what sort of wait times you have for each io request type.

An important aspect to note with this particular data is that the values are transient in that a server restart for example will reset them.

SQL Script Output Column

image

SQL Script Code

SELECT QUOTENAME(DB_NAME(iovfs.[database_id])) [DatabaseName]
    ,iovfs.[file_id] [FileID]
    ,mf.[name] [LogicalName]
    ,mf.[type_desc] [FileType]
    ,SUM(iovfs.[num_of_bytes_read]) [Read_bytes]
    ,SUM(iovfs.[num_of_bytes_written]) [Written_bytes]
    ,SUM(iovfs.[num_of_bytes_read]) / 1048576 [Read_MiB]
    ,SUM(iovfs.[num_of_bytes_written]) / 1048576 [Written_MiB]
    ,SUM(iovfs.[num_of_reads]) [Read_Count]
    ,SUM(iovfs.[num_of_writes]) [Write_Count]
    ,SUM(iovfs.[num_of_reads] + iovfs.[num_of_writes]) 
    [IO_Count]
    ,CONVERT(DECIMAL(15, 2), SUM([num_of_bytes_read]) / (
            SUM([num_of_bytes_read] + [num_of_bytes_written]) * 
            0.01
            )) [Read_Percent]
    ,CONVERT(DECIMAL(15, 2), SUM([num_of_bytes_written]) / (
            SUM([num_of_bytes_read] + [num_of_bytes_written]) * 
            0.01
            )) [Write_Percent]
    ,CONVERT(DECIMAL(15, 2), COALESCE(SUM(iovfs.
                [io_stall_read_ms]) / NULLIF(SUM(iovfs.
                    [num_of_reads] * 1.0), 0), 0)) 
    [AverageReadStall_ms]
    ,CONVERT(DECIMAL(15, 2), COALESCE(SUM(iovfs.
                [io_stall_write_ms]) / NULLIF(SUM(iovfs.
                    [num_of_writes] * 1.0), 0), 0)) 
    [AverageWriteStall_ms]
FROM sys.master_files mf
INNER JOIN sys.dm_io_virtual_file_stats(NULL, NULL) iovfs ON mf.
    [database_id] = iovfs.[database_id]
    AND mf.[file_id] = iovfs.[file_id]
GROUP BY iovfs.[database_id]
    ,iovfs.[file_id]
    ,mf.[name]
    ,mf.[type_desc]
ORDER BY QUOTENAME(DB_NAME(iovfs.[database_id]))
    ,iovfs.[file_id]

SQL Script Output Screenshot

image

User Level to execute

300

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