functions/Get-DbaOpenTransaction.ps1

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function Get-DbaOpenTransaction {
    <#
        .SYNOPSIS
            Displays all open transactions.
 
        .DESCRIPTION
            This command is based on open transaction script published by Paul Randal.
            Reference: https://www.sqlskills.com/blogs/paul/script-open-transactions-with-text-and-plans/
 
        .PARAMETER SqlInstance
            The SQL Server instance
 
        .PARAMETER SqlCredential
            Connect using alternative credentials
 
        .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
            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/Get-DbaOpenTransaction
 
        .EXAMPLE
            Get-DbaOpenTransaction -SqlInstance sqlserver2014a
 
            Returns open transactions for sqlserver2014a
 
        .EXAMPLE
            Get-DbaOpenTransaction -SqlInstance sqlserver2014a -SqlCredential (Get-Credential sqladmin)
 
            Logs into sqlserver2014a using the login "sqladmin"
    #>

    [CmdletBinding()]
    param (
        [parameter(Position = 0, Mandatory = $true, ValueFromPipeline = $True)]
        [Alias("ServerInstance", "SqlServer", "SqlServers")]
        [DbaInstance[]]$SqlInstance,
        [PSCredential]$SqlCredential,
        [switch]$EnableException
    )

    begin {
        $sql = "
            SELECT SERVERPROPERTY('MachineName') AS ComputerName,
            ISNULL(SERVERPROPERTY('InstanceName'), 'MSSQLSERVER') AS InstanceName,
            SERVERPROPERTY('ServerName') AS SqlInstance,
            [s_tst].[session_id] as Spid,
            [s_es].[login_name] as Login,
            DB_NAME (s_tdt.database_id) AS [Database],
            [s_tdt].[database_transaction_begin_time] AS [BeginTime],
            [s_tdt].[database_transaction_log_bytes_used] AS [LogBytesUsed],
            [s_tdt].[database_transaction_log_bytes_reserved] AS [LogBytesReserved],
            [s_est].text AS [LastQuery],
            [s_eqp].[query_plan] AS [LastPlan]
            FROM
                sys.dm_tran_database_transactions [s_tdt]
            JOIN
                sys.dm_tran_session_transactions [s_tst]
            ON
                [s_tst].[transaction_id] = [s_tdt].[transaction_id]
            JOIN
                sys.[dm_exec_sessions] [s_es]
            ON
                [s_es].[session_id] = [s_tst].[session_id]
            JOIN
                sys.dm_exec_connections [s_ec]
            ON
                [s_ec].[session_id] = [s_tst].[session_id]
            LEFT OUTER JOIN
                sys.dm_exec_requests [s_er]
            ON
                [s_er].[session_id] = [s_tst].[session_id]
            CROSS APPLY
                sys.dm_exec_sql_text ([s_ec].[most_recent_sql_handle]) AS [s_est]
            OUTER APPLY
                sys.dm_exec_query_plan ([s_er].[plan_handle]) AS [s_eqp]
            ORDER BY
                [BeginTime] ASC"

    }
    process {
        foreach ($instance in $SqlInstance) {
            Write-Message -Level Verbose -Message "Attempting to connect to $instance"
            try {
                $server = Connect-SqlInstance -SqlInstance $instance -SqlCredential $SqlCredential -MinimumVersion 9
            }
            catch {
                Stop-Function -Message "Failure" -Category ConnectionError -ErrorRecord $_ -Target $instance -Continue
            }

            $server.Query($sql)
        }
    }
}