functions/Get-DbaWaitingTask.ps1

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
function Get-DbaWaitingTask {
    <#
        .SYNOPSIS
            Displays waiting task.
 
        .DESCRIPTION
            This command is based on waiting task T-SQL script published by Paul Randal.
            Reference: https://www.sqlskills.com/blogs/paul/updated-sys-dm_os_waiting_tasks-script-2/
 
        .PARAMETER SqlInstance
            The SQL Server instance. Server version must be SQL Server version XXXX or higher.
 
        .PARAMETER SqlCredential
            Login to the target instance using alternative credentials. Windows and SQL Authentication supported. Accepts credential objects (Get-Credential)
 
        .PARAMETER Spid
            Find the waiting task of one or more specific process ids
 
        .PARAMETER IncludeSystemSpid
            If this switch is enabled, the output will include the system sessions.
 
        .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: Waits,Task,WaitTask
            Author: Shawn Melton (@wsmelton)
 
            Website: https://dbatools.io
            Copyright: (C) Chrissy LeMaire, clemaire@gmail.com
            License: MIT https://opensource.org/licenses/MIT
 
        .LINK
            https://dbatools.io/Get-DbaWaitingTask
 
        .EXAMPLE
            Get-DbaWaitingTask -SqlInstance sqlserver2014a
 
            Returns the waiting task for all sessions on sqlserver2014a
 
        .EXAMPLE
            Get-DbaWaitingTask -SqlInstance sqlserver2014a -IncludeSystemSpid
 
            Returns the waiting task for all sessions (user and system) on sqlserver2014a
    #>

    [CmdletBinding()]
    param (
        [parameter(Position = 0, Mandatory, ValueFromPipeline)]
        [Alias("ServerInstance", "SqlServer", "SqlServers")]
        [DbaInstance[]]$SqlInstance,
        [PSCredential]$SqlCredential,
        [parameter(ValueFromPipelineByPropertyName = $true)]
        [object[]]$Spid,
        [switch]$IncludeSystemSpid,
        [Alias('Silent')]
        [switch]$EnableException
    )

    begin {
        $sql = "
            SELECT
                [owt].[session_id] AS [Spid],
                [owt].[exec_context_id] AS [Thread],
                [ot].[scheduler_id] AS [Scheduler],
                [owt].[wait_duration_ms] AS [WaitMs],
                [owt].[wait_type] AS [WaitType],
                [owt].[blocking_session_id] AS [BlockingSpid],
                [owt].[resource_description] AS [ResourceDesc],
                CASE [owt].[wait_type]
                    WHEN N'CXPACKET' THEN
                        RIGHT ([owt].[resource_description],
                            CHARINDEX (N'=', REVERSE ([owt].[resource_description])) - 1)
                    ELSE NULL
                END AS [NodeId],
                [eqmg].[dop] AS [Dop],
                [er].[database_id] AS [DbId],
                [est].text AS [SqlText],
                [eqp].[query_plan] AS [QueryPlan],
                CAST ('https://www.sqlskills.com/help/waits/' + [owt].[wait_type] as XML) AS [URL]
            FROM sys.dm_os_waiting_tasks [owt]
            INNER JOIN sys.dm_os_tasks [ot] ON
                [owt].[waiting_task_address] = [ot].[task_address]
            INNER JOIN sys.dm_exec_sessions [es] ON
                [owt].[session_id] = [es].[session_id]
            INNER JOIN sys.dm_exec_requests [er] ON
                [es].[session_id] = [er].[session_id]
            FULL JOIN sys.dm_exec_query_memory_grants [eqmg] ON
                [owt].[session_id] = [eqmg].[session_id]
            OUTER APPLY sys.dm_exec_sql_text ([er].[sql_handle]) [est]
            OUTER APPLY sys.dm_exec_query_plan ([er].[plan_handle]) [eqp]
            WHERE
                [es].[is_user_process] = $(if (Test-Bound 'IncludeSystemSpid') {0} else {1})
            ORDER BY
                [owt].[session_id],
                [owt].[exec_context_id]
            OPTION(RECOMPILE);"

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

            $results = $server.Query($sql)
            foreach ($row in $results) {
                if (Test-Bound 'Spid') {
                    if ($row.Spid -notin $Spid) { continue }
                }

                [PSCustomObject]@{
                    ComputerName = $server.ComputerName
                    InstanceName = $server.ServiceName
                    SqlInstance  = $server.DomainInstanceName
                    Spid         = $row.Spid
                    Thread       = $row.Thread
                    Scheduler    = $row.Scheduler
                    WaitMs       = $row.WaitMs
                    WaitType     = $row.WaitType
                    BlockingSpid = $row.BlockingSpid
                    ResourceDesc = $row.ResourceDesc
                    NodeId       = $row.NodeId
                    Dop          = $row.Dop
                    DbId         = $row.DbId
                    SqlText      = $row.SqlText
                    QueryPlan    = $row.QueryPlan
                    InfoUrl      = $row.InfoUrl
                } | Select-DefaultView -ExcludeProperty 'SqlText', 'QueryPlan', 'InfoUrl'
            }
        }
    }
}