functions/Start-DbaTrace.ps1

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#ValidationTags#Messaging,FlowControl,Pipeline,CodeStyle#
function Start-DbaTrace {
    <#
    .SYNOPSIS
        Starts SQL Server traces
 
    .DESCRIPTION
        Starts SQL Server traces
 
    .PARAMETER SqlInstance
        The target SQL Server instance
 
    .PARAMETER SqlCredential
        Login to the target instance using alternative credentials. Windows and SQL Authentication supported. Accepts credential objects (Get-Credential)
 
    .PARAMETER Id
        A list of trace ids
 
    .PARAMETER InputObject
        Internal parameter for piping
 
    .PARAMETER WhatIf
        If this switch is enabled, no actions are performed but informational messages will be displayed that explain what would happen if the command were to run.
 
    .PARAMETER Confirm
        If this switch is enabled, you will be prompted for confirmation before executing any operations that change state.
 
    .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.
 
    .NOTES
        Tags: Security, Trace
        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
 
    .EXAMPLE
        PS C:\> Start-DbaTrace -SqlInstance sql2008
 
        Starts all traces on sql2008
 
    .EXAMPLE
        PS C:\> Start-DbaTrace -SqlInstance sql2008 -Id 1
 
        Starts all trace with ID 1 on sql2008
 
    .EXAMPLE
        PS C:\> Get-DbaTrace -SqlInstance sql2008 | Out-GridView -PassThru | Start-DbaTrace
 
        Starts selected traces on sql2008
 
#>

    [CmdletBinding(SupportsShouldProcess)]
    param (
        [Alias("ServerInstance", "SqlServer")]
        [DbaInstanceParameter[]]$SqlInstance,
        [PSCredential]$SqlCredential,
        [int[]]$Id,
        [parameter(ValueFromPipeline)]
        [object[]]$InputObject,
        [switch]$EnableException
    )
    process {
        if (-not $InputObject -and $SqlInstance) {
            $InputObject = Get-DbaTrace -SqlInstance $SqlInstance -SqlCredential $SqlCredential -Id $Id
        }

        foreach ($trace in $InputObject) {
            if (-not $trace.id -and -not $trace.Parent) {
                Stop-Function -Message "Input is of the wrong type. Use Get-DbaTrace." -Continue
                return
            }

            $server = $trace.Parent
            $traceid = $trace.id
            $default = Get-DbaTrace -SqlInstance $server -Default

            if ($default.id -eq $traceid) {
                Stop-Function -Message "The default trace on $server cannot be started. Use Set-DbaSpConfigure to turn it on." -Continue
            }

            $sql = "sp_trace_setstatus $traceid, 1"
            if ($Pscmdlet.ShouldProcess($traceid, "Starting the TraceID on $server")) {
                try {
                    $server.Query($sql)
                    Get-DbaTrace -SqlInstance $server -Id $traceid
                } catch {
                    Stop-Function -Message "Failure" -ErrorRecord $_ -Target $server -Continue
                    return
                }
            }
        }
    }
}