Create Top Queries by CPU Time.sql

Monitoring Scripts/Top Queries by CPU Time.sql

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+/*========================================================================================================================
+
+Description:	Display data about queries running in the database since @Since sorted by the total CPU time
+Scope:			Database
+Author:			Guy Glantser
+Created:		12/11/2023
+Last Updated:	12/11/2023
+Notes:			The inspiration to this script was derived from this blog post by Jose Manuel Jurado Diaz:
+				https://techcommunity.microsoft.com/t5/azure-database-support-blog/lesson-learned-442-determining-cpu-usage-in-azure-sql-database/ba-p/3953086
+				Unlike Jose's suggestion, which is based on sys.dm_exec_query_stats, this script is based on the Query Store,
+				so it will only work if you have the Query Store enabled, and it will only be reliable if the Query Store contains data since @Since.
+				The main use case for this script is when you encounter a high CPU consumption,
+				and you would like to know which are the top queries that constribute to the high CPU consumption.
+				By examining the CPUTimePercentage column, you will see whether it's a single query that is responsible for most of the CPU consumption
+				or it's many queries that together make an impact.
+
+=========================================================================================================================*/
+
+USE
+	DatabaseName;
+GO
+
+
+DECLARE
+	@Since AS DATETIMEOFFSET = DATEADD (HOUR , -1 , SYSUTCDATETIME ());	-- Since when to collect runtime statistics
+
+WITH
+	Queries
+(
+	QueryId ,
+	QueryText ,
+	ContainingObjectId ,
+	QueryParameterizationType ,
+	PlanId ,
+	QueryPlan ,
+	IsTrivialPlan ,
+	IsParallelPlan ,
+	IsForcedPlan ,
+	LastExecutionTime ,
+	CompilesCount ,
+	AvgCompileDuration ,
+	ExecutionCount ,
+	TotalDuration ,
+	AvgDuration ,
+	TotalCPUTime
+)
+AS
+(
+	SELECT
+		QueryId						= Queries.query_id ,
+		QueryText					= QueryTexts.query_sql_text ,
+		ContainingObjectId			= Queries.[object_id] ,
+		QueryParameterizationType	= Queries.query_parameterization_type_desc ,
+		PlanId						= Plans.plan_id ,
+		QueryPlan					= CAST (Plans.query_plan AS XML) ,
+		IsTrivialPlan				= Plans.is_trivial_plan ,
+		IsParallelPlan				= Plans.is_parallel_plan ,
+		IsForcedPlan				= Plans.is_forced_plan ,
+		LastExecutionTime			= Plans.last_execution_time ,
+		CompilesCount				= Plans.count_compiles ,
+		AvgCompileDuration			= Plans.avg_compile_duration ,
+		ExecutionCount				= SUM (RuntimeStats.count_executions) ,
+		TotalDuration				= SUM (RuntimeStats.count_executions * RuntimeStats.avg_duration) ,
+		AvgDuration					= SUM (RuntimeStats.count_executions * RuntimeStats.avg_duration) / SUM (RuntimeStats.count_executions) ,
+		TotalCPUTime				= SUM (RuntimeStats.count_executions * RuntimeStats.avg_cpu_time)
+	FROM
+		sys.query_store_query_text AS QueryTexts
+	INNER JOIN
+		sys.query_store_query AS Queries
+	ON
+		QueryTexts.query_text_id = Queries.query_text_id 
+	INNER JOIN
+		sys.query_store_plan AS Plans
+	ON
+		Queries.query_id = Plans.query_id
+	INNER JOIN
+		sys.query_store_runtime_stats AS RuntimeStats
+	ON
+		Plans.plan_id = RuntimeStats.plan_id
+	INNER JOIN
+		sys.query_store_runtime_stats_interval AS RuntimeStatsIntervals
+	ON
+		RuntimeStats.runtime_stats_interval_id = RuntimeStatsIntervals.runtime_stats_interval_id
+	WHERE
+	--	RuntimeStats.execution_type = 0	-- Regular
+	--AND
+		RuntimeStatsIntervals.start_time >= @Since
+	GROUP BY
+		Queries.query_id ,
+		QueryTexts.query_sql_text ,
+		Queries.object_id ,
+		Queries.query_parameterization_type_desc ,
+		Plans.plan_id ,
+		Plans.query_plan ,
+		Plans.is_trivial_plan ,
+		Plans.is_parallel_plan ,
+		Plans.is_forced_plan ,
+		Plans.last_execution_time ,
+		Plans.count_compiles ,
+		Plans.avg_compile_duration
+)
+SELECT TOP (100)
+	QueryId						= QueryId ,
+	QueryText					= QueryText ,
+	ContainingObjectId			= ContainingObjectId ,
+	QueryParameterizationType	= QueryParameterizationType ,
+	PlanId						= PlanId ,
+	QueryPlan					= QueryPlan ,
+	IsTrivialPlan				= IsTrivialPlan ,
+	IsParallelPlan				= IsParallelPlan ,
+	IsForcedPlan				= IsForcedPlan ,
+	LastExecutionTime			= LastExecutionTime ,
+	CompilesCount				= CompilesCount ,
+	AvgCompileDuration			= AvgCompileDuration ,
+	ExecutionCount				= ExecutionCount ,
+	TotalDuration				= TotalDuration ,
+	AvgDuration					= AvgDuration ,
+	TotalCPUTime				= TotalCPUTime ,
+	QueryRank					= ROW_NUMBER () OVER (ORDER BY TotalCPUTime DESC) ,
+	CPUTimePercentage			= FORMAT (CAST (TotalCPUTime AS DECIMAL(19,2)) / CAST (SUM (TotalCPUTime) OVER () AS DECIMAL(19,2)) , 'P')
+FROM
+	Queries
+ORDER BY
+	QueryRank ASC;
+GO