dbatools

1.1.76

functions/Get-DbaLatchStatistic.ps1

                                function Get-DbaLatchStatistic {

    <#

    .SYNOPSIS

        Displays latch statistics from sys.dm_os_latch_stats

    .DESCRIPTION

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

        Returns:

                LatchClass

                WaitSeconds

                WaitCount

                Percentage

                AverageWaitSeconds

                URL

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

                    https://www.sqlskills.com/blogs/paul/most-common-latch-classes-and-what-they-mean/

    .PARAMETER SqlInstance

        The SQL Server instance. Server version must be SQL Server version 2005 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 Threshold

        Threshold, in percentage of all latch stats on the system. Default per Paul's post is 95%.

    .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: LatchStatistics, 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-DbaLatchStatistic

    .EXAMPLE

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

        Check latch statistics for servers sql2008 and sqlserver2012

    .EXAMPLE

        PS C:\> Get-DbaLatchStatistic -SqlInstance sql2008 -Threshold 98

        Check latch statistics on server sql2008 for thresholds above 98%

    .EXAMPLE

        PS C:\> $output = Get-DbaLatchStatistic -SqlInstance sql2008 -Threshold 100 | Select-Object * | ConvertTo-DbaDataTable

        Collects all latch statistics on server sql2008 into a Data Table.

    .EXAMPLE

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

        Get latch statistics for servers sql2008 and sqlserver2012 via pipline

    .EXAMPLE

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

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

        Connects using sqladmin credential and returns latch statistics from sql2008

    .EXAMPLE

        PS C:\> $output = Get-DbaLatchStatistic -SqlInstance sql2008

        PS C:\> $output

        PS C:\> foreach ($row in ($output | Sort-Object -Unique Url)) { Start-Process ($row).Url }

        Displays the output then loads the associated sqlskills website for each result. Opens one tab per unique URL.

    #>

    [CmdletBinding()]

    param (

        [parameter(Mandatory, ValueFromPipeline)]

        [DbaInstance[]]$SqlInstance,

        [PSCredential]$SqlCredential,

        [int]$Threshold = 95,

        [switch]$EnableException

    )

    BEGIN {

        $sql = "WITH [Latches] AS

               (

                   SELECT

                       [latch_class],

                       [wait_time_ms] / 1000.0 AS [WaitS],

                       [waiting_requests_count] AS [WaitCount],

                       Case WHEN SUM ([wait_time_ms]) OVER() = 0 THEN NULL ELSE 100.0 * [wait_time_ms] / SUM ([wait_time_ms]) OVER() END AS [Percentage],

                       ROW_NUMBER() OVER(ORDER BY [wait_time_ms] DESC) AS [RowNum]

                   FROM sys.dm_os_latch_stats

                   WHERE [latch_class] NOT IN (N'BUFFER')

               )

               SELECT

                   MAX ([W1].[latch_class]) AS [LatchClass],

                   CAST (MAX ([W1].[WaitS]) AS DECIMAL(14, 2)) AS [WaitSeconds],

                   MAX ([W1].[WaitCount]) AS [WaitCount],

                   CAST (MAX ([W1].[Percentage]) AS DECIMAL(14, 2)) AS [Percentage],

                   CAST ((MAX ([W1].[WaitS]) / MAX ([W1].[WaitCount])) AS DECIMAL (14, 4)) AS [AvgWaitSeconds],

                   CAST ('https://www.sqlskills.com/help/latches/' + MAX ([W1].[latch_class]) as XML) AS [URL]

               FROM [Latches] AS [W1]

               INNER JOIN [Latches] AS [W2]

                   ON [W2].[RowNum] <= [W1].[RowNum]

               GROUP BY [W1].[RowNum]

               HAVING SUM ([W2].[Percentage]) - MAX ([W1].[Percentage]) < $Threshold;"

        Write-Message -Level Debug -Message $sql

    }

    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

                    WaitType           = $row.LatchClass

                    WaitSeconds        = $row.WaitSeconds

                    WaitCount          = $row.WaitCount

                    Percentage         = $row.Percentage

                    AverageWaitSeconds = $row.AvgWaitSeconds

                    URL                = $row.URL

                }

            }

        }

    }

}

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