Get-DbaRgClassifierFunction

Synopsis

Retrieves the Resource Governor classifier function configured for workload group assignment

Description

Retrieves the custom classifier function that Resource Governor uses to determine which workload group incoming connections are assigned to. The classifier function contains the business logic that evaluates connection properties (like login name, application name, or host name) and returns the appropriate workload group name. This function is always stored in the master database and is essential for understanding how Resource Governor categorizes and manages SQL Server workloads.

Syntax

Get-DbaRgClassifierFunction
    [[-SqlInstance] <DbaInstanceParameter[]>]
    [[-SqlCredential] <PSCredential>]
    [[-InputObject] <ResourceGovernor[]>]
    [-EnableException]
    [<CommonParameters>]

Examples

Example: 1

PS C:\> Get-DbaRgClassifierFunction -SqlInstance sql2016

Gets the classifier function from sql2016

Example: 2

PS C:\> 'Sql1','Sql2/sqlexpress' | Get-DbaResourceGovernor | Get-DbaRgClassifierFunction

Gets the classifier function object on Sql1 and Sql2/sqlexpress instances

Optional Parameters

-SqlInstance

The target SQL Server instance or instances

-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.

-InputObject

Accepts Resource Governor objects piped from Get-DbaResourceGovernor.
Use this when processing multiple instances or when you already have Resource Governor objects to work with, allowing for efficient pipeline operations.

-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.

Outputs

Microsoft.SqlServer.Management.Smo.UserDefinedFunction

Returns one UserDefinedFunction object representing the Resource Governor classifier function. The classifier function is always stored in the master database and is used by Resource Governor to assign incoming connections to appropriate workload groups. If no classifier function is configured on the instance, nothing is returned.

Default display properties (via Select-DefaultView):

• ComputerName: The computer name of the SQL Server instance
• InstanceName: The SQL Server instance name
• SqlInstance: The full SQL Server instance name (computer\instance)
• Database: The database containing the function (always ‘master’ for classifier functions)
• Schema: The schema name containing the classifier function
• CreateDate: DateTime when the classifier function was created
• DateLastModified: DateTime when the classifier function was last modified
• Name: The name of the classifier function
• DataType: The return data type of the function (should be nvarchar for classifier functions)

Additional properties available (from SMO UserDefinedFunction object):

• AssemblyName: Name of the CLR assembly if this is a CLR function
• FunctionType: Type of function (Scalar, Table, or Inline)
• ImplementationType: Implementation type (TransactSql or SqlClr)
• IsBuiltIn: Boolean indicating if this is a system function
• IsEditing: Boolean indicating if the function is being edited
• IsSystemObject: Boolean indicating if the function is a system object
• Urn: The unified resource name for the function object
• State: Current state of the SMO object (Existing, Creating, Pending, etc.) All properties from the base SMO UserDefinedFunction object are accessible using Select-Object *.