functions/Test-DbaTempDbConfig.ps1
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function Test-DbaTempDbConfig { <# .SYNOPSIS Evaluates tempdb against several rules to match best practices. .DESCRIPTION Evaluates tempdb against a set of rules to match best practices. The rules are: * TF 1118 enabled - Is Trace Flag 1118 enabled (See KB328551). * File Count - Does the count of data files in tempdb match the number of logical cores, up to 8? * File Growth - Are any files set to have percentage growth? Best practice is all files have an explicit growth value. * File Location - Is tempdb located on the C:\? Best practice says to locate it elsewhere. * File MaxSize Set (optional) - Do any files have a max size value? Max size could cause tempdb problems if it isn't allowed to grow. * Data File Size Equal - Are the sizes of all the tempdb data files the same? Other rules can be added at a future date. .PARAMETER SqlInstance The target SQL Server instance or instances. SQL Server 2005 and higher are supported. .PARAMETER SqlCredential Login to the target instance using alternative credentials. Windows and SQL Authentication supported. Accepts credential objects (Get-Credential) .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: tempdb, configuration Author: Michael Fal (@Mike_Fal), http://mikefal.net Website: https://dbatools.io Copyright: (c) 2018 by dbatools, licensed under MIT License: MIT https://opensource.org/licenses/MIT Based on Amit Bannerjee's (@banerjeeamit) Get-TempDB function (https://github.com/amitmsft/SqlOnAzureVM/blob/master/Get-TempdbFiles.ps1) .LINK https://dbatools.io/Test-DbaTempddbConfig .EXAMPLE PS C:\> Test-DbaTempDbConfig -SqlInstance localhost Checks tempdb on the localhost machine. .EXAMPLE PS C:\> Test-DbaTempDbConfig -SqlInstance localhost | Select-Object * Checks tempdb on the localhost machine. All rest results are shown. .EXAMPLE PS C:\> Get-DbaRegServer -SqlInstance sqlserver2014a | Test-DbaTempDbConfig | Select-Object * | Out-GridView Checks tempdb configuration for a group of servers from SQL Server Central Management Server (CMS). Output includes all columns. Send output to GridView. #> [CmdletBinding()] param ( [parameter(Mandatory, ValueFromPipeline)] [DbaInstance[]]$SqlInstance, [PSCredential]$SqlCredential, [switch]$EnableException ) process { foreach ($instance in $SqlInstance) { try { $server = Connect-SqlInstance -SqlInstance $instance -SqlCredential $SqlCredential -MinimumVersion 9 } catch { Stop-Function -Message "Error occurred while establishing connection to $instance" -Category ConnectionError -ErrorRecord $_ -Target $instance -Continue } # removed previous assumption that 2016+ will have it enabled $tfCheck = $server.Databases['tempdb'].Query("DBCC TRACEON (3604);DBCC TRACESTATUS(-1)") $current = ($tfCheck.TraceFlag -join ',').Contains('1118') [PSCustomObject]@{ ComputerName = $server.ComputerName InstanceName = $server.ServiceName SqlInstance = $server.DomainInstanceName Rule = 'TF 1118 Enabled' Recommended = $true CurrentSetting = $current IsBestPractice = $current -eq $true Notes = 'KB328551 describes how TF 1118 can benefit performance. SQL Server 2016 has this functionality enabled by default.' } Write-Message -Level Verbose -Message "TF 1118 evaluated" #get files and log files $tempdbFiles = Get-DbaDbFile -SqlInstance $server -Database tempdb [array]$dataFiles = $tempdbFiles | Where-Object Type -ne 1 $logFiles = $tempdbFiles | Where-Object Type -eq 1 Write-Message -Level Verbose -Message "TempDB file objects gathered" [PSCustomObject]@{ ComputerName = $server.ComputerName InstanceName = $server.ServiceName SqlInstance = $server.DomainInstanceName Rule = 'File Count' Recommended = [Math]::Min(8, $server.Processors) CurrentSetting = $dataFiles.Count IsBestPractice = $dataFiles.Count -eq [Math]::Min(8, $server.Processors) Notes = 'Microsoft recommends that the number of tempdb data files is equal to the number of logical cores up to 8.' } Write-Message -Level Verbose -Message "File counts evaluated." #test file growth $percData = $dataFiles | Where-Object GrowthType -ne 'KB' | Measure-Object $percLog = $logFiles | Where-Object GrowthType -ne 'KB' | Measure-Object $totalCount = $percData.Count + $percLog.Count if ($totalCount -gt 0) { $totalCount = $true } else { $totalCount = $false } [PSCustomObject]@{ ComputerName = $server.ComputerName InstanceName = $server.ServiceName SqlInstance = $server.DomainInstanceName Rule = 'File Growth in Percent' Recommended = $false CurrentSetting = $totalCount IsBestPractice = $totalCount -eq $false Notes = 'Set file growth to explicit values, not by percent.' } Write-Message -Level Verbose -Message "File growth settings evaluated." #test file Location $cdata = ($dataFiles | Where-Object PhysicalName -like 'C:*' | Measure-Object).Count + ($logFiles | Where-Object PhysicalName -like 'C:*' | Measure-Object).Count if ($cdata -gt 0) { $cdata = $true } else { $cdata = $false } [PSCustomObject]@{ ComputerName = $server.ComputerName InstanceName = $server.ServiceName SqlInstance = $server.DomainInstanceName Rule = 'File Location' Recommended = $false CurrentSetting = $cdata IsBestPractice = $cdata -eq $false Notes = "Do not place your tempdb files on C:\." } Write-Message -Level Verbose -Message "File locations evaluated." #Test growth limits $growthLimits = ($dataFiles | Where-Object MaxSize -gt 0 | Measure-Object).Count + ($logFiles | Where-Object MaxSize -gt 0 | Measure-Object).Count if ($growthLimits -gt 0) { $growthLimits = $true } else { $growthLimits = $false } [PSCustomObject]@{ ComputerName = $server.ComputerName InstanceName = $server.ServiceName SqlInstance = $server.DomainInstanceName Rule = 'File MaxSize Set' Recommended = $false CurrentSetting = $growthLimits IsBestPractice = $growthLimits -eq $false Notes = "Consider setting your tempdb files to unlimited growth." } Write-Message -Level Verbose -Message "MaxSize values evaluated." #Test Data File Size Equal $distinctCountSizeDataFiles = ($dataFiles | Group-Object -Property Size | Measure-Object).Count if ($distinctCountSizeDataFiles -eq 1) { $equalSizeDataFiles = $true } else { $equalSizeDataFiles = $false } [PSCustomObject]@{ ComputerName = $server.ComputerName InstanceName = $server.ServiceName SqlInstance = $server.DomainInstanceName Rule = 'Data File Size Equal' Recommended = $true CurrentSetting = $equalSizeDataFiles IsBestPractice = $equalSizeDataFiles -eq $true Notes = "Consider creating equally sized data files." } Write-Message -Level Verbose -Message "Data File Size Equal evaluated." } } } |