functions/Test-DbaMaxMemory.ps1
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Function Test-DbaMaxMemory { <# .SYNOPSIS Calculates the recommended value for SQL Server 'Max Server Memory' configuration setting. Works on SQL Server 2000-2014. .DESCRIPTION Inspired by Jonathan Kehayias's post about SQL Server Max memory (http://bit.ly/sqlmemcalc), this script displays a SQL Server's: total memory, currently configured SQL max memory, and the calculated recommendation. 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 SqlServer Allows you to specify a comma separated list of servers to query. .PARAMETER SqlCredential Allows you to login to servers using SQL Logins as opposed to Windows Auth/Integrated/Trusted. To use: $cred = Get-Credential, then pass $cred variable to this parameter. Windows Authentication will be used when SqlCredential is not specified. To connect as a different Windows user, run PowerShell as that user. .NOTES dbatools PowerShell module (https://dbatools.io, clemaire@gmail.com) Copyright (C) 2016 Chrissy LeMaire This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. .LINK https://dbatools.io/Get-DbaMaxMemoryory .EXAMPLE Test-DbaMaxMemory -SqlServer sqlcluster,sqlserver2012 Calculate the 'Max Server Memory' settings for all servers within the SQL Server Central Management Server "sqlcluster" .EXAMPLE Test-DbaMaxMemory -SqlServer sqlcluster | Where-Object { $_.SqlMaxMB -gt $_.TotalMB } | Set-DbaMaxMemory Find all servers in CMS that have Max SQL memory set to higher than the total memory of the server (think 2147483647) and set it to recommended value. #> [CmdletBinding()] Param ( [parameter(Position = 0, Mandatory = $true, ValueFromPipeline = $True)] [Alias("ServerInstance", "SqlInstance", "SqlServers")] [object]$SqlServer, [System.Management.Automation.PSCredential]$SqlCredential ) PROCESS { foreach ($servername in $sqlserver) { Write-Verbose "Counting the running SQL Server instances on $servername" try { # Get number of instances running $ipaddr = Resolve-SqlIpAddress -SqlServer $servername $sqls = Get-Service -ComputerName $ipaddr | Where-Object { $_.DisplayName -like 'SQL Server (*' -and $_.Status -eq 'Running' } $sqlcount = $sqls.count } catch { Write-Warning "Couldn't get accurate SQL Server instance count on $servername. Defaulting to 1." $sqlcount = 1 } $server = Get-DbaMaxMemory -SqlServer $servername -SqlCredential $SqlCredential if($server -eq $null) { continue; } $reserve = 1 $maxmemory = $server.SqlMaxMB $totalmemory = $server.TotalMB if ($totalmemory -ge 4096) { $currentCount = $totalmemory while ($currentCount/4096 -gt 0) { if ($currentCount -gt 16384) { $reserve += 1 $currentCount += -8192 } else { $reserve += 1 $currentCount += -4096 } } $recommendedMax = [int]($totalmemory - ($reserve * 1024)) } else { $recommendedMax = $totalmemory * .5 } $recommendedMax = $recommendedMax/$sqlcount [pscustomobject]@{ Server = $server.Server InstanceCount = $sqlcount TotalMB = $totalmemory SqlMaxMB = $maxmemory RecommendedMB = $recommendedMax } } } } |