functions/Test-DbaTempDbConfiguration.ps1
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function Test-DbaTempDbConfiguration { <# .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. Other rules can be added at a future date. .PARAMETER SqlInstance The SQL Server Instance to connect to. SQL Server 2005 and higher are supported. .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 Detailed Output all properties, will be depreciated in 1.0.0 release. .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 Based off of Amit Bannerjee's (@banerjeeamit) Get-TempDB function (https://github.com/amitmsft/SqlOnAzureVM/blob/master/Get-TempdbFiles.ps1) dbatools PowerShell module (https://dbatools.io, clemaire@gmail.com) Copyright (C) 2016 Chrissy LeMaire License: MIT https://opensource.org/licenses/MIT .LINK https://dbatools.io/Test-DbaTempDbConfiguration .EXAMPLE Test-DbaTempDbConfiguration -SqlInstance localhost Checks tempdb on the localhost machine. .EXAMPLE Test-DbaTempDbConfiguration -SqlInstance localhost | Select-Object * Checks tempdb on the localhost machine. All rest results are shown. #> [CmdletBinding()] param ( [parameter(Mandatory = $true)] [Alias("ServerInstance", "SqlServer")] [DbaInstance[]]$SqlInstance, [PSCredential]$SqlCredential, [switch]$Detailed, [Alias('Silent')] [switch]$EnableException ) begin { Test-DbaDeprecation -DeprecatedOn 1.0.0 -Parameter Detailed $result = @() } process { foreach ($instance in $SqlInstance) { Write-Message -Level Verbose -Message "Attempting to connect to $instance" try { $server = Connect-SqlInstance -SqlInstance $instance -SqlCredential $SqlCredential -MinimumVersion 9 } catch { Stop-Function -Message "Failure" -Category ConnectionError -ErrorRecord $_ -Target $instance -Continue } #test for TF 1118 if ($server.VersionMajor -ge 13) { $notes = 'SQL Server 2016 has this functionality enabled by default' # DBA May have changed setting. May need to check. $value = [PSCustomObject]@{ ComputerName = $server.NetName InstanceName = $server.ServiceName SqlInstance = $server.DomainInstanceName Rule = 'TF 1118 Enabled' Recommended = $true CurrentSetting = $true } } else { $sql = "DBCC TRACEON (3604);DBCC TRACESTATUS(-1)" $tfCheck = $server.Databases['tempdb'].Query($sql) $notes = 'KB328551 describes how TF 1118 can benefit performance.' $value = [PSCustomObject]@{ ComputerName = $server.NetName InstanceName = $server.ServiceName SqlInstance = $server.DomainInstanceName Rule = 'TF 1118 Enabled' Recommended = $true CurrentSetting = ($tfCheck.TraceFlag -join ',').Contains('1118') } } if ($value.Recommended -ne $value.CurrentSetting -and $null -ne $value.Recommended) { $isBestPractice = $false } else { $isBestPractice = $true } Add-Member -Force -InputObject $value -MemberType NoteProperty -Name IsBestPractice -Value $isBestPractice Add-Member -Force -InputObject $value -MemberType NoteProperty -Name Notes -Value $notes $result += $value Write-Message -Level Verbose -Message "TF 1118 evaluated" #get files and log files $tempdbFiles = Get-DbaDatabaseFile -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" $value = [PSCustomObject]@{ ComputerName = $server.NetName InstanceName = $server.ServiceName SqlInstance = $server.DomainInstanceName Rule = 'File Count' Recommended = [Math]::Min(8, $server.Processors) CurrentSetting = $dataFiles.Count } if ($value.Recommended -ne $value.CurrentSetting -and $null -ne $value.Recommended) { $isBestPractice = $false } else { $isBestPractice = $true } Add-Member -Force -InputObject $value -MemberType NoteProperty -Name IsBestPractice -Value $isBestPractice Add-Member -Force -InputObject $value -MemberType NoteProperty -Name Notes -Value 'Microsoft recommends that the number of tempdb data files is equal to the number of logical cores up to 8.' $result += $value 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 } $value = [PSCustomObject]@{ ComputerName = $server.NetName InstanceName = $server.ServiceName SqlInstance = $server.DomainInstanceName Rule = 'File Growth in Percent' Recommended = $false CurrentSetting = $totalCount } if ($value.Recommended -ne $value.CurrentSetting -and $null -ne $value.Recommended) { $isBestPractice = $false } else { $isBestPractice = $true } Add-Member -Force -InputObject $value -MemberType NoteProperty -Name IsBestPractice -Value $isBestPractice Add-Member -Force -InputObject $value -MemberType NoteProperty -Name Notes -Value 'Set file growth to explicit values, not by percent.' $result += $value 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 } $value = [PSCustomObject]@{ ComputerName = $server.NetName InstanceName = $server.ServiceName SqlInstance = $server.DomainInstanceName Rule = 'File Location' Recommended = $false CurrentSetting = $cdata } if ($value.Recommended -ne $value.CurrentSetting -and $null -ne $value.Recommended) { $isBestPractice = $false } else { $isBestPractice = $true } Add-Member -Force -InputObject $value -MemberType NoteProperty -Name IsBestPractice -Value $isBestPractice Add-Member -Force -InputObject $value -MemberType NoteProperty -Name Notes -Value "Do not place your tempdb files on C:\." $result += $value 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 } $value = [PSCustomObject]@{ ComputerName = $server.NetName InstanceName = $server.ServiceName SqlInstance = $server.DomainInstanceName Rule = 'File MaxSize Set' Recommended = $false CurrentSetting = $growthLimits } if ($value.Recommended -ne $value.CurrentSetting -and $null -ne $value.Recommended) { $isBestPractice = $false } else { $isBestPractice = $true } Add-Member -Force -InputObject $value -MemberType NoteProperty -Name IsBestPractice -Value $isBestPractice Add-Member -Force -InputObject $value -MemberType NoteProperty -Name Notes -Value "Consider setting your tempdb files to unlimited growth." $result += $value Write-Message -Level Verbose -Message "MaxSize values evaluated." Select-DefaultView -InputObject $result -Property ComputerName, InstanceName, SqlInstance, Rule, Recommended, IsBestPractice } } end { Test-DbaDeprecation -DeprecatedOn "1.0.0" -EnableException:$false -Alias Test-SqlTempDbConfiguration } } |