functions/Set-DbaMaxMemory.ps1
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#ValidationTags#Messaging,FlowControl,Pipeline,CodeStyle# function Set-DbaMaxMemory { <# .SYNOPSIS Sets SQL Server 'Max Server Memory' configuration setting to a new value then displays information this setting. .DESCRIPTION Sets SQL Server max memory then displays information relating to SQL Server Max Memory configuration settings. Inspired by Jonathan Kehayias's post about SQL Server Max memory (http://bit.ly/sqlmemcalc), this uses a formula to determine the default optimum RAM to use, then sets the SQL max value to that number. Jonathan notes that the formula used provides a *general recommendation* that doesn't account for everything that may be going on in your specific environment. .PARAMETER SqlInstance The target SQL Server instance or instances. .PARAMETER MaxMB Specifies the max megabytes .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. .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: MaxMemory, Memory Author: Chrissy LeMaire (@cl), netnerds.net Website: https://dbatools.io Copyright: (c) 2018 by dbatools, licensed under MIT License: MIT https://opensource.org/licenses/MIT .LINK https://dbatools.io/Set-DbaMaxMemory .EXAMPLE PS C:\> Set-DbaMaxMemory sqlserver1 Set max memory to the recommended MB on just one server named "sqlserver1" .EXAMPLE PS C:\> Set-DbaMaxMemory -SqlInstance sqlserver1 -MaxMB 2048 Explicitly max memory to 2048 MB on just one server, "sqlserver1" .EXAMPLE PS C:\> Get-DbaCmsRegServer -SqlInstance sqlserver | Test-DbaMaxMemory | Where-Object { $_.SqlMaxMB -gt $_.TotalMB } | Set-DbaMaxMemory Find all servers in SQL Server Central Management server that have Max SQL memory set to higher than the total memory of the server (think 2147483647), then pipe those to Set-DbaMaxMemory and use the default recommendation. #> [CmdletBinding(SupportsShouldProcess = $true, ConfirmImpact = 'Medium')] param ( [Parameter(Position = 0)] [Alias("ServerInstance", "SqlServer", "SqlServers", "ComputerName")] [DbaInstanceParameter[]]$SqlInstance, [Alias("Credential")] [PSCredential]$SqlCredential, [Parameter(Position = 1)] [int]$MaxMB, [Alias('Silent')] [switch]$EnableException ) begin { if ((Test-Bound -Not -Parameter SqlInstance) -and (Test-Bound -Not -Parameter Collection)) { Stop-Function -Category InvalidArgument -Message "You must specify a server list source using -SqlInstance or you can pipe results from Test-DbaMaxMemory" return } if ($MaxMB -eq 0) { $UseRecommended = $true } } process { if (Test-FunctionInterrupt) { return } foreach ($instance in $SqlInstance) { try { $server = Connect-SqlInstance -SqlInstance $instance -SqlCredential $SqlCredential } catch { Stop-Function -Message "Failure" -Category ConnectionError -ErrorRecord $_ -Target $instance -Continue } if (!(Test-SqlSa -SqlInstance $server -SqlCredential $SqlCredential)) { Stop-Function -Message "Not a sysadmin on $server. Skipping." -Category PermissionDenied -ErrorRecord $_ -Target $server -Continue } try { $currentServer = Test-DbaMaxMemory -SqlInstance $server Add-Member -Force -InputObject $currentServer -NotePropertyName OldMaxValue -NotePropertyValue 0 $currentServer.OldMaxValue = $currentServer.SqlMaxMB } catch { Stop-Function -Message "Issue collecting memory information on $server" -Target $server -ErrorRecord $_ -InnerException $_.Exception -Continue } try { if ($UseRecommended) { Write-Message -Level Verbose -Message "Change $server SQL Server Max Memory from $($currentServer.SqlMaxMB) to $($currentServer.RecommendedMB) MB" if ($currentServer.RecommendedMB -eq 0 -or $null -eq $currentServer.RecommendedMB) { $maxMem = (Test-DbaMaxMemory -SqlInstance $server).RecommendedMB Write-Message -Level VeryVerbose -Message "Max memory recommended: $maxMem" $server.Configuration.MaxServerMemory.ConfigValue = $maxMem } else { $server.Configuration.MaxServerMemory.ConfigValue = $currentServer.RecommendedMB } } else { Write-Message -Level Verbose -Message "Change $server SQL Server Max Memory from $($currentServer.SqlMaxMB) to $MaxMB MB" $server.Configuration.MaxServerMemory.ConfigValue = $MaxMB } if ($PSCmdlet.ShouldProcess($server, "Change Max Memory from $($currentServer.OldMaxValue) to $($server.Configuration.MaxServerMemory.ConfigValue)")) { try { $server.Configuration.Alter() $currentServer.SqlMaxMB = $server.Configuration.MaxServerMemory.ConfigValue } catch { Stop-Function -Message "Failed to apply configuration change for $server" -ErrorRecord $_ -Target $server -Continue } } } catch { Stop-Function -Message "Could not modify Max Server Memory for $server" -ErrorRecord $_ -Target $server -Continue } Add-Member -InputObject $currentServer -Force -MemberType NoteProperty -Name CurrentMaxValue -Value $currentServer.SqlMaxMB Select-DefaultView -InputObject $currentServer -Property ComputerName, InstanceName, SqlInstance, TotalMB, OldMaxValue, CurrentMaxValue } } } |