sys-dm-exec-query-statistics-xml-transact-sql.md

title	sys.dm_exec_query_statistics_xml (Transact-SQL)
description	sys.dm_exec_query_statistics_xml (Transact-SQL)
author	rwestMSFT
ms.author	randolphwest
ms.date	02/24/2023
ms.service	sql
ms.subservice	system-objects
ms.topic	conceptual
f1_keywords	sys.dm_exec_query_statistics_xml sys.dm_exec_query_statistics_xml_TSQL dm_exec_query_statistics_xml_TSQL dm_exec_query_statistics_xml
helpviewer_keywords	sys.dm_exec_query_statistics_xml management view
dev_langs	TSQL

sys.dm_exec_query_statistics_xml (Transact-SQL)

[!INCLUDE sqlserver2016-asdb-asdbmi]

Returns query execution plan for in-flight requests. Use this DMV to retrieve showplan XML with transient statistics.

Syntax

sys.dm_exec_query_statistics_xml(session_id)  

Arguments

session_id
Is the session id executing the batch to be looked up. session_id is smallint. session_id can be obtained from the following dynamic management objects:

• sys.dm_exec_requests

• sys.dm_exec_sessions

• sys.dm_exec_connections

Table Returned

Column Name	Data Type	Description
session_id	smallint	ID of the session. Not nullable.
request_id	int	ID of the request. Not nullable.
sql_handle	varbinary(64)	Is a token that uniquely identifies the batch or stored procedure that the query is part of. Nullable.
plan_handle	varbinary(64)	Is a token that uniquely identifies a query execution plan for a batch that is currently executing. Nullable.
query_plan	xml	Contains the runtime Showplan representation of the query execution plan that is specified with plan_handle containing partial statistics. The Showplan is in XML format. One plan is generated for each batch that contains, for example ad hoc [!INCLUDEtsql] statements, stored procedure calls, and user-defined function calls. Nullable.

Remarks

Important

Owning to a possible random access violation (AV) while executing a monitoring stored procedure with the sys.dm_exec_query_statistics_xml DMV, the Showplan XML attribute <ParameterList> value ParameterRuntimeValue was removed in [!INCLUDEssSQL17] CU 26 and [!INCLUDEsql-server-2019] CU 12. This value could be useful while troubleshooting long running stored procedures.

Starting with [!INCLUDEssSQL17] CU 31 and [!INCLUDEsql-server-2019] CU 19, the collection of the Showplan XML attribute <ParameterList> value ParameterRuntimeValue has been re-enabled with the inclusion of trace flag 2446. This trace flag enables the collection of the runtime parameter value at the cost of introducing additional overhead.

Warning

Trace Flag 2446 isn't meant to be enabled continuously in a production environment, but only for time-limited troubleshooting purposes. Using this trace flag will introduce additional and possibly significant CPU and memory overhead as we will create a Showplan XML fragment with runtime parameter information, whether the sys.dm_exec_query_statistics_xml DMV is called or not.

Note

Starting with [!INCLUDEssSQL22], [!INCLUDEAzure SQL Database], and [!INCLUDEAzure SQL Managed Instance], to accomplish this at the database level see the FORCE_SHOWPLAN_RUNTIME_PARAMETER_COLLECTION option in ALTER DATABASE SCOPED CONFIGURATION (Transact-SQL).

This system function is available starting with [!INCLUDEsssql16-md] SP1. See KB 3190871

This system function works under both standard and lightweight query execution statistics profiling infrastructure. For more information, see Query Profiling Infrastructure.

Under the following conditions, no Showplan output is returned in the query_plan column of the returned table for sys.dm_exec_query_statistics_xml:

• If the query plan that corresponds to the specified session_id is no longer executing, the query_plan column of the returned table is null. For example, this condition may occur if there is a time delay between when the plan handle was captured and when it was used with sys.dm_exec_query_statistics_xml.

Due to a limitation in the number of nested levels allowed in the xml data type, sys.dm_exec_query_statistics_xml cannot return query plans that meet or exceed 128 levels of nested elements. In earlier versions of [!INCLUDEssNoVersion], this condition prevented the query plan from returning and generates error 6335. In [!INCLUDEssVersion2005] Service Pack 2 and later versions, the query_plan column returns NULL.

Permissions

On [!INCLUDEssNoVersion], requires VIEW SERVER STATE permission on the server.
On [!INCLUDEssSDS] Premium Tiers, requires the VIEW DATABASE STATE permission in the database. On [!INCLUDEssSDS] Standard and Basic Tiers, requires the Server admin or a Microsoft Entra admin account.

Permissions for SQL Server 2022 and later

Requires VIEW SERVER PERFORMANCE STATE permission on the server.

Examples

A. Looking at live query plan and execution statistics for a running batch

The following example queries sys.dm_exec_requests to find the interesting query and copy its session_id from the output.

SELECT * FROM sys.dm_exec_requests;  
GO  

Then, to obtain the live query plan and execution statistics, use the copied session_id with system function sys.dm_exec_query_statistics_xml.

--Run this in a different session than the session in which your query is running.
SELECT * FROM sys.dm_exec_query_statistics_xml(< copied session_id >);  
GO  

Or combined for all running requests.

--Run this in a different session than the session in which your query is running.
SELECT 
	eqs.query_plan, 
	er.session_id, 
	er.request_id, 
	er.database_id,
	er.start_time,
	er.[status], 
	er.wait_type,
	er.wait_resource, 
	er.last_wait_type,
	(er.cpu_time/1000) AS cpu_time_sec,
	(er.total_elapsed_time/1000)/60 AS elapsed_time_minutes,
	(er.logical_reads*8)/1024 AS logical_reads_KB,
	er.granted_query_memory,
	er.dop,
	er.row_count, 
	er.query_hash, 
	er.query_plan_hash
FROM sys.dm_exec_requests er
	CROSS APPLY sys.dm_exec_query_statistics_xml(session_id) eqs
WHERE er.session_id <> @@spid;
GO

See Also

Trace Flags
Dynamic Management Views and Functions (Transact-SQL)
Database Related Dynamic Management Views (Transact-SQL)