dbatools

1.1.76

functions/Get-DbaIoLatency.ps1

                                function Get-DbaIoLatency {

    <#

    .SYNOPSIS

        Displays IO subsystem latency statistics from sys.dm_io_virtual_file_stats.  Works on SQL Server 2005 and above.

    .DESCRIPTION

        This command is based off of Paul Randal's post "Advanced SQL Server performance tuning"

        Returns both raw and aggregate information

        Reference:  https://www.sqlskills.com/blogs/paul/how-to-examine-io-subsystem-latencies-from-within-sql-server/

                    https://www.sqlskills.com/blogs/paul/capturing-io-latencies-period-time/

    .PARAMETER SqlInstance

        The SQL Server instance. Server version must be SQL Server version 2008 or higher.

    .PARAMETER SqlCredential

        Login to the target instance using alternative credentials. Accepts PowerShell credentials (Get-Credential).

        Windows Authentication, SQL Server Authentication, Active Directory - Password, and Active Directory - Integrated are all supported.

        For MFA support, please use Connect-DbaInstance.

    .PARAMETER EnableException

        By default, when something goes wrong we try to catch it, interpret it and give you a friendly warning message.

        This avoids overwhelming you with "sea of red" exceptions, but is inconvenient because it basically disables advanced scripting.

        Using this switch turns this "nice by default" feature off and enables you to catch exceptions with your own try/catch.

    .NOTES

        Tags: Diagnostic, IOLatency

        Author: Patrick Flynn (@sqllensman)

        Website: https://dbatools.io

        Copyright: (c) 2018 by dbatools, licensed under MIT

        License: MIT https://opensource.org/licenses/MIT

    .LINK

        https://dbatools.io/Get-DbaIoLatency

    .EXAMPLE

        PS C:\> Get-DbaIoLatency -SqlInstance sql2008, sqlserver2012

        Get IO subsystem latency statistics for servers sql2008 and sqlserver2012.

    .EXAMPLE

        PS C:\> $output = Get-DbaIoLatency -SqlInstance sql2008 | Select-Object * | ConvertTo-DbaDataTable

        Collects all IO subsystem latency statistics on server sql2008 into a Data Table.

    .EXAMPLE

        PS C:\> 'sql2008','sqlserver2012' | Get-DbaIoLatency

        Get IO subsystem latency statistics for servers sql2008 and sqlserver2012 via pipline

    .EXAMPLE

        PS C:\> $cred = Get-Credential sqladmin

        PS C:\> Get-DbaIoLatency -SqlInstance sql2008 -SqlCredential $cred

        Connects using sqladmin credential and returns IO subsystem latency statistics from sql2008

    #>

    [CmdletBinding()]

    Param (

        [parameter(Mandatory, ValueFromPipeline)]

        [DbaInstance[]]$SqlInstance,

        [PSCredential]$SqlCredential,

        [switch]$EnableException

    )

    BEGIN {

        $sql = "SELECT

            [vfs].[database_id],

            DB_NAME ([vfs].[database_id]) AS [DatabaseName],

            [vfs].[file_id],

            [mf].[physical_name],

            [num_of_reads],

            [io_stall_read_ms],

            [num_of_writes],

            [io_stall_write_ms],

            [io_stall],

            [num_of_bytes_read],

            [num_of_bytes_written],

            [sample_ms],

            [size_on_disk_bytes],

            [file_handle],

            [ReadLatency] =

            CASE WHEN [num_of_reads] = 0

                THEN 0

                ELSE ([io_stall_read_ms] / [num_of_reads])

            END,

            [WriteLatency] =

                CASE WHEN [num_of_writes] = 0

                    THEN 0

                    ELSE ([io_stall_write_ms] / [num_of_writes])

                END,

            [Latency] =

                CASE WHEN ([num_of_reads] = 0 AND [num_of_writes] = 0)

                    THEN 0

                    ELSE ([io_stall] / ([num_of_reads] + [num_of_writes]))

                END,

            [AvgBPerRead] =

                CASE WHEN [num_of_reads] = 0

                    THEN 0

                    ELSE ([num_of_bytes_read] / [num_of_reads])

                END,

            [AvgBPerWrite] =

                CASE WHEN [num_of_writes] = 0

                    THEN 0

                    ELSE ([num_of_bytes_written] / [num_of_writes])

                END,

            [AvgBPerTransfer] =

                CASE WHEN ([num_of_reads] = 0 AND [num_of_writes] = 0)

                    THEN 0

                    ELSE

                        (([num_of_bytes_read] + [num_of_bytes_written]) /

                        ([num_of_reads] + [num_of_writes]))

                    END

        FROM sys.dm_io_virtual_file_stats (NULL,NULL) AS [vfs]

        INNER JOIN sys.master_files AS [mf]

            ON [vfs].[database_id] = [mf].[database_id]

            AND [vfs].[file_id] = [mf].[file_id];"

        Write-Message -Level Debug -Message $sql

        $excludeColumns = 'FileHandle', 'ReadLatency', 'WriteLatency', 'Latency', 'AvgBPerRead', 'AvgBPerWrite', 'AvgBPerTransfer'

    }

    process {

        if (Test-FunctionInterrupt) { return }

        foreach ($instance in $SqlInstance) {

            try {

                $server = Connect-DbaInstance -SqlInstance $instance -SqlCredential $SqlCredential -MinimumVersion 9

            } catch {

                Stop-Function -Message "Failure" -Category ConnectionError -ErrorRecord $_ -Target $instance -Continue

            }

            foreach ($row in $server.Query($sql)) {

                [PSCustomObject]@{

                    ComputerName         = $server.ComputerName

                    InstanceName         = $server.ServiceName

                    SqlInstance          = $server.DomainInstanceName

                    DatabaseId           = $row.database_id

                    DatabaseName         = $row.DatabaseName

                    FileId               = $row.file_id

                    PhysicalName         = $row.physical_name

                    NumberOfReads        = $row.num_of_reads

                    IoStallRead          = $row.io_stall_read_ms

                    NumberOfwrites       = $row.num_of_writes

                    IoStallWrite         = $row.io_stall_write_ms

                    IoStall              = $row.io_stall

                    NumberOfBytesRead    = $row.num_of_bytes_read

                    NumberOfBytesWritten = $row.num_of_bytes_written

                    SampleMilliseconds   = $row.sample_ms

                    SizeOnDiskBytes      = $row.size_on_disk_bytes

                    FileHandle           = $row.file_handle

                    ReadLatency          = $row.ReadLatency

                    WriteLatency         = $row.WriteLatency

                    Latency              = $row.Latency

                    AvgBPerRead          = $row.AvgBPerRead

                    AvgBPerWrite         = $row.AvgBPerWrite

                    AvgBPerTransfer      = $row.AvgBPerTransfer

                } | Select-DefaultView -ExcludeProperty $excludeColumns

            }

        }

    }

}

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