Test-DbaMaxMemory

Want to see the source code for this command? Check out Test-DbaMaxMemory on GitHub.
Want to see the Bill Of Health for this command? Check out 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.

Syntax

Test-DbaMaxMemory
    [-SqlInstance] <DbaInstanceParameter[]>
    [[-SqlCredential] <PSCredential>]
    [[-Credential] <PSCredential>]
    [-EnableException]
    [<CommonParameters>]

Examples

Example: 1

PS C:\> Test-DbaMaxMemory -SqlInstance sqlcluster,sqlserver2012

Calculate the 'Max Server Memory' for SQL Server instances sqlcluster and sqlserver2012

Example: 2

PS C:\> Get-DbaRegServer -SqlInstance sqlcluster | Test-DbaMaxMemory

Calculate the 'Max Server Memory' settings for all servers within the SQL Server Central Management Server "sqlcluster"

Example: 3

PS C:\> Get-DbaRegServer -SqlInstance sqlcluster | Test-DbaMaxMemory | Where-Object { $_.MaxValue -gt $_.Total } | 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.

Required Parameters

-SqlInstance

The target SQL Server instance or instances.

Optional Parameters

-SqlCredential

Login to the target instance using alternative credentials. Accepts PowerShell credentials (Get-Credential).
Windows Authentication, SQL Server Authentication, Active Directory - Password, and Active Directory - Integrated are all supported.
For MFA support, please use Connect-DbaInstance.

-Credential

Windows Credential with permission to log on to the server running the SQL instance

-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.