functions/Clear-DbaSqlConnectionPool.ps1

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function Clear-DbaSqlConnectionPool {
<#
    .SYNOPSIS
        Resets (or empties) the connection pool.
 
    .DESCRIPTION
        This command resets (or empties) the connection pool.
 
        If there are connections in use at the time of the call, they are marked appropriately and will be discarded (instead of being returned to the pool) when Close() is called on them.
 
        Ref: https://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlconnection.clearallpools(v=vs.110).aspx
 
    .PARAMETER ComputerName
        Target computer(s). If no computer name is specified, the local computer is targeted.
 
    .PARAMETER Credential
        Alternate credential object to use for accessing the target computer(s).
 
    .PARAMETER Silent
        Use this switch to disable any kind of verbose messages.
 
    .NOTES
        Tags: Connection
 
        Website: https://dbatools.io
        Copyright: (C) Chrissy LeMaire, clemaire@gmail.com
        License: GNU GPL v3 https://opensource.org/licenses/GPL-3.0
 
    .LINK
        https://dbatools.io/Clear-DbaSqlConnectionPool
 
    .EXAMPLE
        Clear-DbaSqlConnectionPool
 
        Clears all local connection pools.
 
    .EXAMPLE
        Clear-DbaSqlConnectionPool -ComputerName workstation27
 
        Clears all connection pools on workstation27.
#>

    [CmdletBinding()]
    param (
        [Parameter(ValueFromPipeline = $true)]
        [Alias("cn", "host", "Server")]
        [DbaInstanceParameter[]]$ComputerName = $env:COMPUTERNAME,
        [PSCredential]$Credential,
        [switch]$Silent
    )
    
    process {
        # TODO: https://jamessdixon.wordpress.com/2013/01/22/ado-net-and-connection-pooling
        
        foreach ($computer in $ComputerName) {
            if (-not $computer.IsLocalhost) {
                Write-Message -Level Verbose -Message "Clearing all pools on remote computer $computer"
                if (Test-Bound 'Credential') {
                    Invoke-Command2 -ComputerName $computer -Credential $Credential -ScriptBlock { [System.Data.SqlClient.SqlConnection]::ClearAllPools() }
                }
                else {
                    Invoke-Command2 -ComputerName $computer -ScriptBlock { [System.Data.SqlClient.SqlConnection]::ClearAllPools() }
                }
            }
            else {
                Write-Message -Level Verbose -Message "Clearing all local pools"
                if (Test-Bound 'Credential') {
                    Invoke-Command2 -Credential $Credential -ScriptBlock { [System.Data.SqlClient.SqlConnection]::ClearAllPools() }
                }
                else {
                    Invoke-Command2 -ScriptBlock { [System.Data.SqlClient.SqlConnection]::ClearAllPools() }
                }
            }
        }
    }
}