functions/Get-DbaTempdbUsage.ps1
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function Get-DbaTempdbUsage { <# .SYNOPSIS Gets Tempdb usage for running queries. .DESCRIPTION This function queries DMVs for running sessions using tempdb and returns results if those sessions have user or internal space allocated or deallocated against them. .PARAMETER SqlInstance The target SQL Server instance or instances. .PARAMETER 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. .PARAMETER WhatIf Shows what would happen if the command were to run. No actions are actually performed. .PARAMETER Confirm Prompts you for confirmation before executing any changing operations within the command. .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: Tempdb 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 .LINK https://dbatools.io/Get-DbaTempdbUsage .EXAMPLE PS C:\> Get-DbaTempdbUsage -SqlInstance localhost\SQLDEV2K14 Gets tempdb usage for localhost\SQLDEV2K14 #> [CmdletBinding()] param ( [parameter(Mandatory, ValueFromPipeline)] [DbaInstanceParameter[]]$SqlInstance, [PSCredential]$SqlCredential, [switch]$EnableException ) process { foreach ($instance in $SqlInstance) { try { $server = Connect-SqlInstance -SqlInstance $instance -SqlCredential $SqlCredential } catch { Stop-Function -Message "Error occurred while establishing connection to $instance" -Category ConnectionError -ErrorRecord $_ -Target $instance -Continue } if ($server.VersionMajor -le 9) { Stop-Function -Message "This function is only supported in SQL Server 2008 or higher." -Continue } $sql = "SELECT SERVERPROPERTY('MachineName') AS ComputerName, ISNULL(SERVERPROPERTY('InstanceName'), 'MSSQLSERVER') AS InstanceName, SERVERPROPERTY('ServerName') AS SqlInstance, t.session_id AS Spid, r.command AS StatementCommand, SUBSTRING( est.[text], (r.statement_start_offset / 2) + 1, ((CASE r.statement_end_offset WHEN-1 THEN DATALENGTH(est.[text]) ELSE r.statement_end_offset END - r.statement_start_offset ) / 2 ) + 1 ) AS QueryText, QUOTENAME(DB_NAME(r.database_id)) + N'.' + QUOTENAME(OBJECT_SCHEMA_NAME(est.objectid, est.dbid)) + N'.' + QUOTENAME(OBJECT_NAME(est.objectid, est.dbid)) AS ProcedureName, r.start_time AS StartTime, tdb.UserObjectAllocated * 8 AS CurrentUserAllocatedKB, (t.user_objects_alloc_page_count + tdb.UserObjectAllocated) * 8 AS TotalUserAllocatedKB, tdb.UserObjectDeallocated * 8 AS UserDeallocatedKB, (t.user_objects_dealloc_page_count + tdb.UserObjectDeallocated) * 8 AS TotalUserDeallocatedKB, tdb.InternalObjectAllocated * 8 AS InternalAllocatedKB, (t.internal_objects_alloc_page_count + tdb.InternalObjectAllocated) * 8 AS TotalInternalAllocatedKB, tdb.InternalObjectDeallocated * 8 AS InternalDeallocatedKB, (t.internal_objects_dealloc_page_count + tdb.InternalObjectDeallocated) * 8 AS TotalInternalDeallocatedKB, r.reads AS RequestedReads, r.writes AS RequestedWrites, r.logical_reads AS RequestedLogicalReads, r.cpu_time AS RequestedCPUTime, s.is_user_process AS IsUserProcess, s.[status] AS [Status], DB_NAME(r.database_id) AS [Database], s.login_name AS LoginName, s.original_login_name AS OriginalLoginName, s.nt_domain AS NTDomain, s.nt_user_name AS NTUserName, s.[host_name] AS HostName, s.[program_name] AS ProgramName, s.login_time AS LoginTime, s.last_request_start_time AS LastRequestedStartTime, s.last_request_end_time AS LastRequestedEndTime FROM sys.dm_db_session_space_usage AS t INNER JOIN sys.dm_exec_sessions AS s ON s.session_id = t.session_id LEFT JOIN sys.dm_exec_requests AS r ON r.session_id = s.session_id LEFT JOIN ( SELECT _tsu.session_id, _tsu.request_id, SUM(_tsu.user_objects_alloc_page_count) AS UserObjectAllocated, SUM(_tsu.user_objects_dealloc_page_count) AS UserObjectDeallocated, SUM(_tsu.internal_objects_alloc_page_count) AS InternalObjectAllocated, SUM(_tsu.internal_objects_dealloc_page_count) AS InternalObjectDeallocated FROM tempdb.sys.dm_db_task_space_usage AS _tsu GROUP BY _tsu.session_id, _tsu.request_id ) AS tdb ON tdb.session_id = r.session_id AND tdb.request_id = r.request_id OUTER APPLY sys.dm_exec_sql_text(r.[sql_handle]) AS est WHERE t.session_id != @@SPID AND (tdb.UserObjectAllocated - tdb.UserObjectDeallocated + tdb.InternalObjectAllocated - tdb.InternalObjectDeallocated) != 0 OPTION (RECOMPILE);" $server.Query($sql) } } } |