functions/Set-DbaMaxDop.ps1
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function Set-DbaMaxDop { <# .SYNOPSIS Sets SQL Server maximum degree of parallelism (Max DOP), then displays information relating to SQL Server Max DOP configuration settings. Works on SQL Server 2005 and higher. .DESCRIPTION Uses the Test-DbaMaxDop command to get the recommended value if -MaxDop parameter is not specified. These are just general recommendations for SQL Server and are a good starting point for setting the "max degree of parallelism" option. You can set MaxDop database scoped configurations if the server is version 2016 or higher .PARAMETER SqlInstance The SQL Server instance to connect to. .PARAMETER SqlCredential Allows you to login to servers using SQL Logins instead of Windows Authentication (AKA Integrated or Trusted). To use: $scred = Get-Credential, then pass $scred object to the -SqlCredential parameter. Windows Authentication will be used if SqlCredential is not specified. SQL Server does not accept Windows credentials being passed as credentials. To connect as a different Windows user, run PowerShell as that user. .PARAMETER Database Specifies one or more databases to process. Options for this list are auto-populated from the server. If unspecified, all databases will be processed. .PARAMETER ExcludeDatabase Specifies one or more databases to exclude from processing. Options for this list are auto-populated from the server .PARAMETER MaxDop Specifies the Max DOP value to set. .PARAMETER AllDatabases If this switch is enabled, Max DOP will be set on all databases. This switch is only useful on SQL Server 2016 and higher. .PARAMETER Collection If Test-SQLMaxDop has been executed prior to this function, the results may be passed in via this parameter. .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. .PARAMETER WhatIf Shows what would happen if the cmdlet runs. The cmdlet is not run. .PARAMETER Confirm Prompts you for confirmation before running the cmdlet. .NOTES Tags: Author: Claudio Silva (@claudioessilva) Website: https://dbatools.io Copyright: (C) Chrissy LeMaire, clemaire@gmail.com License: MIT https://opensource.org/licenses/MIT .LINK https://dbatools.io/Set-DbaMaxDop .EXAMPLE Set-DbaMaxDop -SqlInstance sql2008, sql2012 Sets Max DOP to the recommended value for servers sql2008 and sql2012. .EXAMPLE Set-DbaMaxDop -SqlInstance sql2014 -MaxDop 4 Sets Max DOP to 4 for server sql2014. .EXAMPLE Test-DbaMaxDop -SqlInstance sql2008 | Set-DbaMaxDop Gets the recommended Max DOP from Test-DbaMaxDop and applies it to to sql2008. .EXAMPLE Set-DbaMaxDop -SqlInstance sql2016 -Database db1 Set recommended Max DOP for database db1 on server sql2016. .EXAMPLE Set-DbaMaxDop -SqlInstance sql2016 -AllDatabases Set recommended Max DOP for all databases on server sql2016. #> [CmdletBinding(SupportsShouldProcess = $true)] param ( [parameter(Position = 0, Mandatory = $true, ValueFromPipeline = $True)] [Alias("ServerInstance", "SqlServer")] [DbaInstanceParameter[]]$SqlInstance, [Alias("Credential")] [PSCredential]$SqlCredential, [Alias("Databases")] [object[]]$Database, [object[]]$ExcludeDatabase, [int]$MaxDop = -1, [Parameter(ValueFromPipeline = $True)] [object]$Collection, [Alias("All")] [switch]$AllDatabases, [Alias('Silent')] [switch]$EnableException ) begin { $processed = New-Object System.Collections.ArrayList $results = @() } process { if ((Test-Bound -Parameter Database) -and (Test-Bound -Parameter AllDatabases) -and (Test-Bound -Parameter ExcludeDatabase)) { Stop-Function -Category InvalidArgument -Message "-Database, -AllDatabases and -ExcludeDatabase are mutually exclusive. Please choose only one. Quitting." return } $dbscopedconfiguration = $false if ($MaxDop -eq -1) { $UseRecommended = $true } if ((Test-Bound -Not -Parameter Collection)) { $collection = Test-DbaMaxDop -SqlInstance $sqlinstance -SqlCredential $SqlCredential -Verbose:$false } elseif ($null -eq $collection.SqlInstance) { $collection = Test-DbaMaxDop -SqlInstance $sqlinstance -SqlCredential $SqlCredential -Verbose:$false } $collection | Add-Member -Force -NotePropertyName OldInstanceMaxDopValue -NotePropertyValue 0 $collection | Add-Member -Force -NotePropertyName OldDatabaseMaxDopValue -NotePropertyValue 0 #If we have servers 2016 or higher we will have a row per database plus the instance level, getting unique we only run one time per instance $servers = $collection | Select-Object SqlInstance -Unique foreach ($server in $servers) { $servername = $server.SqlInstance Write-Message -Level Verbose -Message "Connecting to $servername" try { $server = Connect-SqlInstance -SqlInstance $servername -SqlCredential $SqlCredential } catch { Stop-Function -Message "Failure" -Category ConnectionError -ErrorRecord $_ -Target $servername -Continue } if (!(Test-SqlSa -SqlInstance $server)) { Stop-Function -Message "Not a sysadmin on $server. Skipping." -Category PermissionDenied -ErrorRecord $_ -Target $currentServer -Continue } if ($server.versionMajor -ge 13) { Write-Message -Level Verbose -Message "Server '$servername' supports Max DOP configuration per database." if ((Test-Bound -Not -Parameter Database) -and (Test-Bound -Not -Parameter ExcludeDatabase)) { #Set at instance level $collection = $collection | Where-Object { $_.DatabaseMaxDop -eq "N/A" } } else { $dbscopedconfiguration = $true if ((Test-Bound -Not -Parameter AllDatabases) -and (Test-Bound -Parameter Database)) { $collection = $collection | Where-Object { $_.Database -in $Database } } elseif ((Test-Bound -Not -Parameter AllDatabases) -and (Test-Bound -Parameter ExcludeDatabase)) { $collection = $collection | Where-Object { $_.Database -notin $ExcludeDatabase } } else { if (Test-Bound -Parameter AllDatabases) { $collection = $collection | Where-Object { $_.DatabaseMaxDop -ne "N/A" } } else { $collection = $collection | Where-Object { $_.DatabaseMaxDop -eq "N/A" } $dbscopedconfiguration = $false } } } } else { if ((Test-Bound -Parameter database) -or (Test-Bound -Parameter AllDatabases)) { Write-Message -Level Warning -Message "Server '$servername' (v$($server.versionMajor)) does not support Max DOP configuration at the database level. Remember that this option is only available from SQL Server 2016 (v13). Run the command again without using database related parameters. Skipping." Continue } } foreach ($row in $collection | Where-Object { $_.SqlInstance -eq $servername }) { if ($UseRecommended -and ($row.RecommendedMaxDop -eq $row.CurrentInstanceMaxDop) -and !($dbscopedconfiguration)) { Write-Message -Level Verbose -Message "$servername is configured properly. No change required." Continue } if ($UseRecommended -and ($row.RecommendedMaxDop -eq $row.DatabaseMaxDop) -and $dbscopedconfiguration) { Write-Message -Level Verbose -Message "Database $($row.Database) on $servername is configured properly. No change required." Continue } $row.OldInstanceMaxDopValue = $row.CurrentInstanceMaxDop try { if ($UseRecommended) { if ($dbscopedconfiguration) { $row.OldDatabaseMaxDopValue = $row.DatabaseMaxDop if ($resetDatabases) { Write-Message -Level Verbose -Message "Changing $($row.Database) database max DOP to $($row.DatabaseMaxDop)." $server.Databases["$($row.Database)"].MaxDop = $row.DatabaseMaxDop } else { Write-Message -Level Verbose -Message "Changing $($row.Database) database max DOP from $($row.DatabaseMaxDop) to $($row.RecommendedMaxDop)." $server.Databases["$($row.Database)"].MaxDop = $row.RecommendedMaxDop $row.DatabaseMaxDop = $row.RecommendedMaxDop } } else { Write-Message -Level Verbose -Message "Changing $server SQL Server max DOP from $($row.CurrentInstanceMaxDop) to $($row.RecommendedMaxDop)." $server.Configuration.MaxDegreeOfParallelism.ConfigValue = $row.RecommendedMaxDop $row.CurrentInstanceMaxDop = $row.RecommendedMaxDop } } else { if ($dbscopedconfiguration) { $row.OldDatabaseMaxDopValue = $row.DatabaseMaxDop Write-Message -Level Verbose -Message "Changing $($row.Database) database max DOP from $($row.DatabaseMaxDop) to $MaxDop." $server.Databases["$($row.Database)"].MaxDop = $MaxDop $row.DatabaseMaxDop = $MaxDop } else { Write-Message -Level Verbose -Message "Changing $servername SQL Server max DOP from $($row.CurrentInstanceMaxDop) to $MaxDop." $server.Configuration.MaxDegreeOfParallelism.ConfigValue = $MaxDop $row.CurrentInstanceMaxDop = $MaxDop } } if ($dbscopedconfiguration) { if ($Pscmdlet.ShouldProcess($row.Database, "Setting max dop on database")) { $server.Databases["$($row.Database)"].Alter() } } else { if ($Pscmdlet.ShouldProcess($servername, "Setting max dop on instance")) { $server.Configuration.Alter() } } $results += [pscustomobject]@{ ComputerName = $server.NetName InstanceName = $server.ServiceName SqlInstance = $server.DomainInstanceName InstanceVersion = $row.InstanceVersion Database = $row.Database DatabaseMaxDop = $row.DatabaseMaxDop CurrentInstanceMaxDop = $row.CurrentInstanceMaxDop RecommendedMaxDop = $row.RecommendedMaxDop OldDatabaseMaxDopValue = $row.OldDatabaseMaxDopValue OldInstanceMaxDopValue = $row.OldInstanceMaxDopValue } } catch { Stop-Function -Message "Could not modify Max Degree of Parallelism for $server." -ErrorRecord $_ -Target $server -Continue } } if ($dbscopedconfiguration) { Select-DefaultView -InputObject $results -Property InstanceName, Database, OldDatabaseMaxDopValue, @{ name = "CurrentDatabaseMaxDopValue"; expression = { $_.DatabaseMaxDop } } } else { Select-DefaultView -InputObject $results -Property InstanceName, OldInstanceMaxDopValue, CurrentInstanceMaxDop } } } } |