Note
Access to this page requires authorization. You can try signing in or changing directories.
Access to this page requires authorization. You can try changing directories.
Applies to: 
Azure Synapse Analytics
Displays the SQL Server execution plan for a query running on a specific Azure Synapse Analytics Compute node or Control node. Use this to troubleshoot query performance problems while queries are running on the Compute nodes and Control node.
Once query performance problems are understood for SMP SQL Server queries running on the Compute nodes, there are several ways to improve performance. Possible ways to improve query performance on the Compute nodes include creating multi-column statistics, creating nonclustered indexes, or using query hints.
Transact-SQL syntax conventions
Syntax
Syntax for Azure Synapse Analytics:
DBCC PDW_SHOWEXECUTIONPLAN ( distribution_id , spid )
[;]
Note
This syntax is not supported by serverless SQL pool in Azure Synapse Analytics.
Arguments
distribution_id
Identifier for the distribution that is running the query plan. This is an integer and can't be NULL. Value must be between 1 and 60. Used when targeting Azure Synapse Analytics.
spid
Identifier for the SQL Server session that is running the query plan. This is an integer and can't be NULL.
Permissions
Requires CONTROL permission on Azure Synapse Analytics.
Requires VIEW SERVER STATE permission on the Appliance.
Examples: Azure Synapse Analytics
A. DBCC PDW_SHOWEXECUTIONPLAN basic syntax
The following sample query will return the sql_spid for each actively running distribution.
SELECT [sql_spid]
, [pdw_node_id]
, [request_id]
, [dms_step_index]
, [type]
, [start_time]
, [end_time]
, [status]
, [distribution_id]
FROM sys.dm_pdw_dms_workers
WHERE [status] <> 'StepComplete'
AND [status] <> 'StepError'
ORDER BY request_id
, [dms_step_index];
If you are curious as to what distribution_id 1 was running in session 375, you would run the following command:
DBCC PDW_SHOWEXECUTIONPLAN (1, 375);