dbatools

1.1.76

functions/Clear-DbaWaitStatistics.ps1

                                function Clear-DbaWaitStatistics {

    <#

    .SYNOPSIS

        Clears wait statistics

    .DESCRIPTION

        Reset the aggregated statistics - basically just executes DBCC SQLPERF (N'sys.dm_os_wait_stats', CLEAR)

    .PARAMETER SqlInstance

        The target SQL Server instance or instances.

    .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 WhatIf

        If this switch is enabled, no actions are performed but informational messages will be displayed that explain what would happen if the command were to run.

    .PARAMETER Confirm

        If this switch is enabled, you will be prompted for confirmation before executing any operations that change state.

    .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, WaitStats, Waits

        Author: Chrissy LeMaire (@cl)

        Website: https://dbatools.io

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

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

    .LINK

        https://dbatools.io/Clear-DbaWaitStatistics

    .EXAMPLE

        PS C:\> Clear-DbaWaitStatistics -SqlInstance sql2008, sqlserver2012

        After confirmation, clears wait stats on servers sql2008 and sqlserver2012

    .EXAMPLE

        PS C:\> Clear-DbaWaitStatistics -SqlInstance sql2008, sqlserver2012 -Confirm:$false

        Clears wait stats on servers sql2008 and sqlserver2012, without prompting

    #>

    [CmdletBinding(ConfirmImpact = 'High', SupportsShouldProcess)]

    [Diagnostics.CodeAnalysis.SuppressMessageAttribute("PSUseSingularNouns", "", Justification = "Singular Noun doesn't make sense")]

    param (

        [parameter(Mandatory, ValueFromPipeline)]

        [DbaInstance[]]$SqlInstance,

        [PSCredential]$SqlCredential,

        [switch]$EnableException

    )

    process {

        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

            }

            if ($Pscmdlet.ShouldProcess($instance, "Performing CLEAR of sys.dm_os_wait_stats")) {

                try {

                    $server.Query("DBCC SQLPERF (N'sys.dm_os_wait_stats', CLEAR);")

                    $status = "Success"

                } catch {

                    $status = $_.Exception

                }

                [PSCustomObject]@{

                    ComputerName = $server.ComputerName

                    InstanceName = $server.ServiceName

                    SqlInstance  = $server.DomainInstanceName

                    Status       = $status

                }

            }

        }

    }

}

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