May 17, 2026, 11:40 PM
This commit is contained in:
Paweł Domański
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--=========================================--
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/*** SQL SERVER CPU MONITORING QUERIES ***/
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--=========================================------
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-- Supported Versions SQL server 2008 and higher
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-------------------------------------------------
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-------------------------------------
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/*** 1. Current CPU Utilization ***/
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-------------------------------------
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DECLARE @ts BIGINT;
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DECLARE @lastNmin TINYINT;
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SELECT @ts = (SELECT cpu_ticks / ( cpu_ticks / ms_ticks )
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FROM sys.dm_os_sys_info);
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SELECT TOP(1) Dateadd(ms, -1 * ( @ts - [timestamp] ), Getdate())AS [EventTime],
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sqlprocessutilization AS
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[SQL Server Utilization],
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100 - systemidle - sqlprocessutilization AS
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[Other Process CPU_Utilization],
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systemidle AS [System Idle]
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FROM (SELECT
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record.value('(./Record/@id)[1]', 'int') AS record_id,
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record.value('(./Record/SchedulerMonitorEvent/SystemHealth/SystemIdle)[1]', 'int') AS [SystemIdle],
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record.value('(./Record/SchedulerMonitorEvent/SystemHealth/ProcessUtilization)[1]', 'int')AS [SQLProcessUtilization],
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[timestamp]
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FROM (SELECT[timestamp],
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CONVERT(XML, record) AS [record]
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FROM sys.dm_os_ring_buffers
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WHERE ring_buffer_type = N'RING_BUFFER_SCHEDULER_MONITOR'
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AND record LIKE'%%')AS x)AS y
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ORDER BY record_id DESC;
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---------------------------------------------
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/*** 2.CPU Utilization for last N minutes***/
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---------------------------------------------
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-- Mention the minutes in @lastNmin Parameter
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DECLARE @ts BIGINT;
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DECLARE @lastNmin TINYINT;
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SET @lastNmin = 15; --Mention the Minutes Here
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SELECT @ts = (SELECT cpu_ticks / ( cpu_ticks / ms_ticks )
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FROM sys.dm_os_sys_info);
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SELECT TOP(@lastNmin) Dateadd(ms, -1 * ( @ts - [timestamp] ), Getdate())AS
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[EventTime],
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sqlprocessutilization AS
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[SQL Server Utilization],
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100 - systemidle - sqlprocessutilization AS
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[Other Process CPU_Utilization],
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systemidle AS
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[System Idle]
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FROM (SELECT
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record.value('(./Record/@id)[1]', 'int') AS record_id,
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record.value('(./Record/SchedulerMonitorEvent/SystemHealth/SystemIdle)[1]', 'int') AS [SystemIdle],
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record.value('(./Record/SchedulerMonitorEvent/SystemHealth/ProcessUtilization)[1]', 'int')AS [SQLProcessUtilization],
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[timestamp]
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FROM (SELECT[timestamp],
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CONVERT(XML, record) AS [record]
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FROM sys.dm_os_ring_buffers
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WHERE ring_buffer_type = N'RING_BUFFER_SCHEDULER_MONITOR'
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AND record LIKE'%%')AS x)AS y
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ORDER BY record_id DESC;
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------------------------------------------
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/*** 3.Database wise CPU Utilization ***/
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------------------------------------------
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WITH db_cpu
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AS (SELECT databaseid,
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Db_name(databaseid) AS [DatabaseName],
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Sum(total_worker_time)AS [CPU_Time(Ms)]
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FROM sys.dm_exec_query_stats AS qs
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CROSS apply(SELECT CONVERT(INT, value)AS [DatabaseID]
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FROM sys.Dm_exec_plan_attributes(qs.plan_handle)
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WHERE attribute = N'dbid')AS epa
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GROUP BY databaseid)
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SELECT Row_number()
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OVER(
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ORDER BY [cpu_time(ms)] DESC) AS [SNO],
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databasename AS [DBName]
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,
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[cpu_time(ms)],
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Cast([cpu_time(ms)] * 1.0 / Sum([cpu_time(ms)])
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OVER() * 100.0 AS DECIMAL(5, 2))AS
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[CPUPercent]
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FROM db_cpu
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WHERE databaseid > 4 -- system databases
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AND databaseid <> 32767 -- ResourceDB
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ORDER BY sno
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OPTION(recompile);
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---------------------------------------
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/*** 4.Query Wise CPU Utilization ***/
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---------------------------------------
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-- This Query will show the queries and its CPU time if the avg CPU usgae is > 50
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-- You can modify this in IF @AvgCPUUtilization >= 50
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SET nocount ON
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DECLARE @ts_now BIGINT
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DECLARE @AvgCPUUtilization DECIMAL(10, 2)
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SELECT @ts_now = cpu_ticks / ( cpu_ticks / ms_ticks )
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FROM sys.dm_os_sys_info
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-- load the CPU utilization in the past 10 minutes into the temp table, you can load them into a permanent table
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SELECT TOP(10) sqlprocessutilization AS
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[SQLServerProcessCPUUtilization],
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systemidle AS
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[SystemIdleProcess],
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100 - systemidle - sqlprocessutilization AS
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[OtherProcessCPU Utilization],
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Dateadd(ms, -1 * ( @ts_now - [timestamp] ), Getdate()) AS
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[EventTime]
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INTO #cpuutilization
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FROM (SELECT record.value('(./Record/@id)[1]', 'int')
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AS record_id,
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record.value('(./Record/SchedulerMonitorEvent/SystemHealth/SystemIdle)[1]',
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'int')
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AS [SystemIdle],
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record.value('(./Record/SchedulerMonitorEvent/SystemHealth/ProcessUtilization)[1]', 'int') AS [SQLProcessUtilization],
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[timestamp]
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FROM (SELECT [timestamp],
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CONVERT(XML, record) AS [record]
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FROM sys.dm_os_ring_buffers
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WHERE ring_buffer_type = N'RING_BUFFER_SCHEDULER_MONITOR'
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AND record LIKE '%<SystemHealth>%') AS x) AS y
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ORDER BY record_id DESC
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-- check if the average CPU utilization was over 50% in the past 10 minutes
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SELECT @AvgCPUUtilization = Avg([sqlserverprocesscpuutilization]
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+ [otherprocesscpu utilization])
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FROM #cpuutilization
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WHERE eventtime > Dateadd(mm, -10, Getdate())
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IF @AvgCPUUtilization >= 50
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BEGIN
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SELECT TOP(10) CONVERT(VARCHAR(25), @AvgCPUUtilization)
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+ '%' AS
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[AvgCPUUtilization],
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Getdate()
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[Date and Time]
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,
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r.cpu_time,
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r.total_elapsed_time,
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s.session_id,
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s.login_name,
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s.host_name,
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Db_name(r.database_id) AS
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DatabaseName
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,
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Substring (t.text, ( r.statement_start_offset / 2 ) + 1, (
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( CASE
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WHEN r.statement_end_offset = -1 THEN
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Len(CONVERT(NVARCHAR(max), t.text)) *
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2
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ELSE r.statement_end_offset
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END - r.statement_start_offset ) / 2 ) + 1) AS
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[IndividualQuery],
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Substring(text, 1, 200) AS [ParentQuery],
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r.status,
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r.start_time,
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r.wait_type,
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s.program_name
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INTO #possiblecpuutilizationqueries
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FROM sys.dm_exec_sessions s
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INNER JOIN sys.dm_exec_connections c
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ON s.session_id = c.session_id
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INNER JOIN sys.dm_exec_requests r
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ON c.connection_id = r.connection_id
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CROSS apply sys.Dm_exec_sql_text(r.sql_handle) t
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WHERE s.session_id > 50
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AND r.session_id != @@spid
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ORDER BY r.cpu_time DESC
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SELECT *
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FROM #possiblecpuutilizationqueries
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END
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-- drop the temp tables
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IF Object_id('TEMPDB..#CPUUtilization') IS NOT NULL
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DROP TABLE #cpuutilization
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IF Object_id('TEMPDB..#PossibleCPUUtilizationQueries') IS NOT NULL
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DROP TABLE #possiblecpuutilizationqueries
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---------------------------------
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/*** 5.TOP costliest Queries ***/
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---------------------------------
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-- This will give top 20 costliest queries which are executed recently.
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SELECT TOP (20) st.text AS Query,
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qs.execution_count,
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qs.total_worker_time AS Total_CPU,
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total_CPU_inSeconds = --Converted from microseconds
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qs.total_worker_time / 1000000,
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average_CPU_inSeconds = --Converted from microseconds
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( qs.total_worker_time / 1000000 ) / qs.execution_count,
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qs.total_elapsed_time,
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total_elapsed_time_inSeconds = --Converted from microseconds
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qs.total_elapsed_time / 1000000,
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qp.query_plan
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FROM sys.dm_exec_query_stats AS qs
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CROSS apply sys.Dm_exec_sql_text(qs.sql_handle) AS st
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CROSS apply sys.Dm_exec_query_plan (qs.plan_handle) AS qp
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ORDER BY qs.total_worker_time DESC
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OPTION (recompile);
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-------------------------------------------------------------
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/*** 5.TOP costliest Queries with batch and more details ***/
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-------------------------------------------------------------
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SELECT TOP 50
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[Avg. MultiCore/CPU time(sec)] = qs.total_worker_time / 1000000 / qs.execution_count,
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[Total MultiCore/CPU time(sec)] = qs.total_worker_time / 1000000,
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[Avg. Elapsed Time(sec)] = qs.total_elapsed_time / 1000000 / qs.execution_count,
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[Total Elapsed Time(sec)] = qs.total_elapsed_time / 1000000,
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qs.execution_count,
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[Avg. I/O] = (total_logical_reads + total_logical_writes) / qs.execution_count,
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[Total I/O] = total_logical_reads + total_logical_writes,
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Query = SUBSTRING(qt.[text], (qs.statement_start_offset / 2) + 1,
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(
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(
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CASE qs.statement_end_offset
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WHEN -1 THEN DATALENGTH(qt.[text])
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ELSE qs.statement_end_offset
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END - qs.statement_start_offset
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) / 2
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) + 1
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),
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Batch = qt.[text],
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[DB] = DB_NAME(qt.[dbid]),
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qs.last_execution_time,
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qp.query_plan
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FROM sys.dm_exec_query_stats AS qs
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CROSS APPLY sys.dm_exec_sql_text(qs.[sql_handle]) AS qt
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CROSS APPLY sys.dm_exec_query_plan(qs.plan_handle) AS qp
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ORDER BY [Total MultiCore/CPU time(sec)] DESC;
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