DSCResources/DSC_SqlMaxDop/DSC_SqlMaxDop.psm1
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$script:sqlServerDscHelperModulePath = Join-Path -Path $PSScriptRoot -ChildPath '..\..\Modules\SqlServerDsc.Common' $script:resourceHelperModulePath = Join-Path -Path $PSScriptRoot -ChildPath '..\..\Modules\DscResource.Common' Import-Module -Name $script:sqlServerDscHelperModulePath Import-Module -Name $script:resourceHelperModulePath $script:localizedData = Get-LocalizedData -DefaultUICulture 'en-US' <# .SYNOPSIS This function gets the max degree of parallelism server configuration option. .PARAMETER ServerName The host name of the SQL Server to be configured. .PARAMETER InstanceName The name of the SQL instance to be configured. #> function Get-TargetResource { [CmdletBinding()] [OutputType([System.Collections.Hashtable])] param ( [Parameter(Mandatory = $true)] [ValidateNotNullOrEmpty()] [System.String] $InstanceName, [Parameter()] [ValidateNotNullOrEmpty()] [System.String] $ServerName = (Get-ComputerName) ) Write-Verbose -Message ( $script:localizedData.GetConfiguration -f $InstanceName ) $currentMaxDop = $null $isActiveNode = $null $sqlServerObject = Connect-SQL -ServerName $ServerName -InstanceName $InstanceName if ($sqlServerObject) { # Is this node actively hosting the SQL instance? $isActiveNode = Test-ActiveNode -ServerObject $sqlServerObject $currentMaxDop = $sqlServerObject.Configuration.MaxDegreeOfParallelism.ConfigValue } $returnValue = @{ InstanceName = $InstanceName ServerName = $ServerName MaxDop = $currentMaxDop IsActiveNode = $isActiveNode ProcessOnlyOnActiveNode = $null Ensure = $null DynamicAlloc = $null } $returnValue } <# .SYNOPSIS This function sets the max degree of parallelism server configuration option. .PARAMETER ServerName The host name of the SQL Server to be configured. .PARAMETER InstanceName The name of the SQL instance to be configured. .PARAMETER Ensure When set to 'Present' then max degree of parallelism will be set to either the value in parameter MaxDop or dynamically configured when parameter DynamicAlloc is set to $true. When set to 'Absent' max degree of parallelism will be set to 0 which means no limit in number of processors used in parallel plan execution. .PARAMETER DynamicAlloc If set to $true then max degree of parallelism will be dynamically configured. When this is set parameter is set to $true, the parameter MaxDop must be set to $null or not be configured. .PARAMETER MaxDop A numeric value to limit the number of processors used in parallel plan execution. .PARAMETER ProcessOnlyOnActiveNode Specifies that the resource will only determine if a change is needed if the target node is the active host of the SQL Server Instance. Not used in Set-TargetResource. #> function Set-TargetResource { [CmdletBinding()] param ( [Parameter(Mandatory = $true)] [ValidateNotNullOrEmpty()] [System.String] $InstanceName, [Parameter()] [ValidateNotNullOrEmpty()] [System.String] $ServerName = (Get-ComputerName), [Parameter()] [ValidateSet('Present', 'Absent')] [ValidateNotNullOrEmpty()] [System.String] $Ensure = 'Present', [Parameter()] [System.Boolean] $DynamicAlloc, [Parameter()] [System.Int32] $MaxDop, [Parameter()] [System.Boolean] $ProcessOnlyOnActiveNode ) $sqlServerObject = Connect-SQL -ServerName $ServerName -InstanceName $InstanceName if ($sqlServerObject) { Write-Verbose -Message ( $script:localizedData.SetConfiguration -f $InstanceName ) switch ($Ensure) { 'Present' { if ($DynamicAlloc) { if ($MaxDop) { $errorMessage = $script:localizedData.MaxDopParamMustBeNull New-InvalidArgumentException -ArgumentName 'MaxDop' -Message $errorMessage } $targetMaxDop = Get-SqlDscDynamicMaxDop -SqlServerObject $sqlServerObject Write-Verbose -Message ( $script:localizedData.DynamicMaxDop -f $targetMaxDop ) } else { $targetMaxDop = $MaxDop } } 'Absent' { $targetMaxDop = 0 Write-Verbose -Message ( $script:localizedData.SettingDefaultValue -f $targetMaxDop ) } } try { $sqlServerObject.Configuration.MaxDegreeOfParallelism.ConfigValue = $targetMaxDop $sqlServerObject.Alter() Write-Verbose -Message ( $script:localizedData.ChangeValue -f $targetMaxDop ) } catch { $errorMessage = $script:localizedData.MaxDopSetError New-InvalidOperationException -Message $errorMessage -ErrorRecord $_ } } } <# .SYNOPSIS This function tests the max degree of parallelism server configuration option. .PARAMETER ServerName The host name of the SQL Server to be configured. .PARAMETER InstanceName The name of the SQL instance to be configured. .PARAMETER Ensure When set to 'Present' then max degree of parallelism will be set to either the value in parameter MaxDop or dynamically configured when parameter DynamicAlloc is set to $true. When set to 'Absent' max degree of parallelism will be set to 0 which means no limit in number of processors used in parallel plan execution. .PARAMETER DynamicAlloc If set to $true then max degree of parallelism will be dynamically configured. When this is set parameter is set to $true, the parameter MaxDop must be set to $null or not be configured. .PARAMETER MaxDop A numeric value to limit the number of processors used in parallel plan execution. .PARAMETER ProcessOnlyOnActiveNode Specifies that the resource will only determine if a change is needed if the target node is the active host of the SQL Server Instance. #> function Test-TargetResource { [System.Diagnostics.CodeAnalysis.SuppressMessageAttribute('SqlServerDsc.AnalyzerRules\Measure-CommandsNeededToLoadSMO', '', Justification='The command Connect-Sql is called when Get-TargetResource is called')] [CmdletBinding()] [OutputType([System.Boolean])] param ( [Parameter(Mandatory = $true)] [ValidateNotNullOrEmpty()] [System.String] $InstanceName, [Parameter()] [ValidateNotNullOrEmpty()] [System.String] $ServerName = (Get-ComputerName), [Parameter()] [ValidateSet('Present', 'Absent')] [ValidateNotNullOrEmpty()] [System.String] $Ensure = 'Present', [Parameter()] [System.Boolean] $DynamicAlloc, [Parameter()] [System.Int32] $MaxDop, [Parameter()] [System.Boolean] $ProcessOnlyOnActiveNode ) Write-Verbose -Message ( $script:localizedData.EvaluationConfiguration ) $parameters = @{ InstanceName = $InstanceName ServerName = $ServerName } $getTargetResourceResult = Get-TargetResource @parameters $getMaxDop = $getTargetResourceResult.MaxDop $isMaxDopInDesiredState = $true <# If this is supposed to process only the active node, and this is not the active node, don't bother evaluating the test. #> if ( $ProcessOnlyOnActiveNode -and -not $getTargetResourceResult.IsActiveNode ) { Write-Verbose -Message ( $script:localizedData.NotActiveNode -f (Get-ComputerName), $InstanceName ) return $isMaxDopInDesiredState } switch ($Ensure) { 'Absent' { $defaultMaxDopValue = 0 if ($getMaxDop -ne $defaultMaxDopValue) { Write-Verbose -Message ( $script:localizedData.WrongMaxDop -f $getMaxDop, $defaultMaxDopValue ) $isMaxDopInDesiredState = $false } } 'Present' { if ($DynamicAlloc) { if ($MaxDop) { $errorMessage = $script:localizedData.MaxDopParamMustBeNull New-InvalidArgumentException -ArgumentName 'MaxDop' -Message $errorMessage } $MaxDop = Get-SqlDscDynamicMaxDop Write-Verbose -Message ( $script:localizedData.DynamicMaxDop -f $MaxDop ) } if ($getMaxDop -ne $MaxDop) { Write-Verbose -Message ( $script:localizedData.WrongMaxDop -f $getMaxDop, $MaxDop ) $isMaxDopInDesiredState = $false } } } $isMaxDopInDesiredState } <# .SYNOPSIS This cmdlet is used to return the dynamic max degree of parallelism #> function Get-SqlDscDynamicMaxDop { $cimInstanceProc = Get-CimInstance -ClassName Win32_Processor # init variables $numberOfLogicalProcessors = 0 $numberOfCores = 0 # Loop through returned objects foreach ($processor in $cimInstanceProc) { # increment number of processors $numberOfLogicalProcessors += $processor.NumberOfLogicalProcessors # increment number of cores $numberOfCores += $processor.NumberOfCores } if ($numberOfLogicalProcessors -eq 1) { $dynamicMaxDop = [Math]::Round($numberOfCores / 2, [System.MidpointRounding]::AwayFromZero) } elseif ($numberOfCores -ge 8) { $dynamicMaxDop = 8 } else { $dynamicMaxDop = $numberOfCores } $dynamicMaxDop } |