dbatools

1.0.168

functions/Get-DbaSpinLockStatistic.ps1

                                function Get-DbaSpinLockStatistic {

    <#

    .SYNOPSIS

        Displays information from sys.dm_os_spinlock_stats.  Works on SQL Server 2008 and above.

    .DESCRIPTION

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

            Returns:

                    SpinLockName

                    Collisions

                    Spins

                    SpinsPerCollision

                    SleepTime

                    Backoffs

            Reference:  https://www.sqlskills.com/blogs/paul/advanced-performance-troubleshooting-waits-latches-spinlocks/

    .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: SpinLockStatistics, Waits

        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-DbaSpinLockStatistic

    .EXAMPLE

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

        Get SpinLock Statistics for servers sql2008 and sqlserver2012.

    .EXAMPLE

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

        Collects all SpinLock Statistics on server sql2008 into a Data Table.

    .EXAMPLE

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

        Get SpinLock Statistics for servers sql2008 and sqlserver2012 via pipline

    .EXAMPLE

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

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

        Connects using sqladmin credential and returns SpinLock Statistics from sql2008

    #>

    [CmdletBinding()]

    Param (

        [parameter(Mandatory, ValueFromPipeline)]

        [DbaInstance[]]$SqlInstance,

        [PSCredential]$SqlCredential,

        [switch]$EnableException

    )

    BEGIN {

        $sql = "SELECT

                    name,

                    collisions,

                    spins,

                    spins_per_collision,

                    sleep_time,

                    backoffs

                FROM sys.dm_os_spinlock_stats;"

        Write-Message -Level Debug -Message $sql

    }

    process {

        if (Test-FunctionInterrupt) { return }

        foreach ($instance in $SqlInstance) {

            Write-Message -Level Verbose -Message "Connecting to $instance"

            try {

                $server = Connect-SqlInstance -SqlInstance $instance -SqlCredential $SqlCredential -MinimumVersion 10

            } catch {

                Stop-Function -Message "Error occurred while establishing connection to $instance" -Category ConnectionError -ErrorRecord $_ -Target $instance -Continue

            }

            Write-Message -Level Verbose -Message "Connected to $instance"

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

                [PSCustomObject]@{

                    ComputerName      = $server.ComputerName

                    InstanceName      = $server.ServiceName

                    SqlInstance       = $server.DomainInstanceName

                    SpinLockName      = $row.name

                    Collisions        = $row.collisions

                    Spins             = $row.spins

                    SpinsPerCollision = $row.spins_per_collision

                    SleepTime         = $row.sleep_time

                    Backoffs          = $row.backoffs

                }

            }

        }

    }

}

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