SQL Server Live Health Check
| September 17, 2022 | Baseline-SQL-Server, Blocking Alert, Performance Tuning, TSQL, WhatIsRunning | 6 Comments
Working as a DBA, I often get pulled into issues where application teams complain about “database server is slow”.
This general statement “server is slow” requires an equally robust approach that can help us figure out if there is an issue with CPU, memory, io, or regressed query. At this point, I prefer to use my SQLMonitor dashboard. This tool is entirely free and open source, and can be deployed on SQL Server 2014+ irrespective of any environment or edition.
But there are times when I don’t have SQLMonitor deployed on a server for which I am being brought to look at. This is the point where I use my below general Server Health Check query https://ajaydwivedi.com/query/health mentioned below –
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-- https://www.sqlskills.com/blogs/jonathan/identifying-external-memory-pressure-with-dm_os_ring_buffers-and-ring_buffer_resource_monitor/ USE master; /* Version: v0.2 Update Date: 25-Mar-2022 */ SET NOCOUNT ON; SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED; SET LOCK_TIMEOUT 60000; -- 60 seconds DECLARE @pool_name sysname --= 'REST'; DECLARE @cpu_trend_minutes INT = 30; DECLARE @top_x_program_rows SMALLINT = 10; DECLARE @top_x_query_rows SMALLINT = 10; DECLARE @long_running_query_threshold_minutes INT = 10; DECLARE @get_blitz_analysis BIT = 0; DECLARE @only_X_resultset smallint = -1; DECLARE @show_plan TINYINT = 1; /* 0 = no plan, 1 = query plan, 2 = batch plan */ DECLARE @all_requests TINYINT = 1; DECLARE @granted_memory_threshold_mb decimal(20,2) = 500.00; DECLARE @show_io_latency BIT = 1; DECLARE @io_snapshot_durations_seconds tinyint = 5; DECLARE @sort_order_all_sessions varchar(500); --SET @sort_order_all_sessions = '[elapsed_time_sec], [granted_query_memory_kb] desc'; --SET @sort_order_all_sessions = '[login_name][elapsed_time_sec] desc'; SET @sort_order_all_sessions = '[cpu] desc, [tasks] desc'; DECLARE @current_time_UTC datetime = sysutcdatetime(); -- Capture running sessions for Blocking IF OBJECT_ID('tempdb..#SysProcesses') IS NOT NULL DROP TABLE #SysProcesses; select Concat ( RIGHT('00'+CAST(ISNULL((datediff(second,er.start_time,GETDATE()) / 3600 / 24), 0) AS VARCHAR(2)),2) ,' ' ,RIGHT('00'+CAST(ISNULL(datediff(second,er.start_time,GETDATE()) / 3600 % 24, 0) AS VARCHAR(2)),2) ,':' ,RIGHT('00'+CAST(ISNULL(datediff(second,er.start_time,GETDATE()) / 60 % 60, 0) AS VARCHAR(2)),2) ,':' ,RIGHT('00'+CAST(ISNULL(datediff(second,er.start_time,GETDATE()) % 3600 % 60, 0) AS VARCHAR(2)),2) ) as [dd hh:mm:ss] --,datediff(MILLISECOND,er.start_time,GETDATE()) as elapsed_time_ms ,s.session_id as session_id ,t.text as sql_command ,SUBSTRING(t.text, (er.statement_start_offset/2)+1, ((CASE er.statement_end_offset WHEN -1 THEN DATALENGTH(t.text) ELSE er.statement_end_offset END - er.statement_start_offset)/2) + 1) AS sql_text --,s.cmd as command ,er.command as command ,tsk.tasks ,s.login_name as login_name ,db_name(s.database_id) as database_name ,[program_name] = CASE WHEN s.program_name like 'SQLAgent - TSQL JobStep %' THEN ( select top 1 'SQL Job = '+j.name from msdb.dbo.sysjobs (nolock) as j inner join msdb.dbo.sysjobsteps (nolock) AS js on j.job_id=js.job_id where right(cast(js.job_id as nvarchar(50)),10) = RIGHT(substring(s.program_name,30,34),10) ) + ' ( '+SUBSTRING(LTRIM(RTRIM(s.program_name)), CHARINDEX(': Step ',LTRIM(RTRIM(s.program_name)))+2,LEN(LTRIM(RTRIM(s.program_name)))-CHARINDEX(': Step ',LTRIM(RTRIM(s.program_name)))-2)+' )' ELSE REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE (s.program_name, '0', '#'),'1', '#'),'2', '#'),'3', '#'),'4', '#'),'5', '#'),'6', '#'),'7', '#'),'8', '#'),'9', '#') END ,(case when er.wait_time = 0 then null else er.last_wait_type end) as wait_type ,er.wait_time as wait_time ,(SELECT CASE WHEN pageid = 1 OR pageid % 8088 = 0 THEN 'PFS' WHEN pageid = 2 OR pageid % 511232 = 0 THEN 'GAM' WHEN pageid = 3 OR (pageid - 1) % 511232 = 0 THEN 'SGAM' WHEN pageid IS NULL THEN NULL ELSE 'Not PFS/GAM/SGAM' END FROM (SELECT CASE WHEN er.[wait_type] LIKE 'PAGE%LATCH%' AND er.[wait_resource] LIKE '%:%' THEN CAST(RIGHT(er.[wait_resource], LEN(er.[wait_resource]) - CHARINDEX(':', er.[wait_resource], LEN(er.[wait_resource])-CHARINDEX(':', REVERSE(er.[wait_resource])))) AS INT) ELSE NULL END AS pageid) AS latch_pageid ) AS wait_resource_type ,null as tempdb_allocations ,null as tempdb_current ,er.blocking_session_id ,er.logical_reads as reads ,er.writes as writes ,s.is_user_process ,[session_row_count] = s.row_count ,[request_row_count] = er.row_count ,physical_io = coalesce(er.reads, s.reads) ,cpu = coalesce(er.cpu_time, s.cpu_time) ,memusage = coalesce(er.granted_query_memory, s.memory_usage) ,s.status ,open_tran = s.open_transaction_count ,[granted_query_memory] = CASE WHEN ((er.granted_query_memory*8.0)/1024/1024) >= 1.0 THEN CAST(CONVERT(NUMERIC(20,2),(er.granted_query_memory *8.0)/1024/1024) AS VARCHAR(23)) + ' GB' WHEN ((er.granted_query_memory *8.0)/1024) >= 1.0 THEN CAST(CONVERT(NUMERIC(20,2),(er.granted_query_memory *8.0)/1024) AS VARCHAR(23)) + ' MB' ELSE CAST(CONVERT(NUMERIC(20,2),er.granted_query_memory *8.0) AS VARCHAR(23)) + ' KB' END ,granted_query_memory_kb = er.granted_query_memory*8.0 ,[host_name] = s.host_name ,er.start_time as start_time ,s.login_time as login_time ,rp.Pool ,er.sql_handle ,er.plan_handle ,[request_cpu_time] = er.cpu_time ,[request_start_time] = er.start_time ,er.query_hash ,er.query_plan_hash ,[BatchQueryPlan] = case when @show_plan >= 2 then bqp.query_plan else 'set @show_plan = 2 to get plans' end ,[SqlQueryPlan] = case when @show_plan >= 1 then convert(xml,sqp.query_plan) else 'set @show_plan = 1 to get plans' end ,er.request_id ,[elapsed_time_sec] = DATEDIFF(second,start_time,GETDATE()) ,GETDATE() as collection_time INTO #SysProcesses FROM sys.dm_exec_sessions AS s LEFT JOIN sys.dm_exec_requests AS er ON er.session_id = s.session_id OUTER APPLY (select top 1 dec.most_recent_sql_handle as [sql_handle] from sys.dm_exec_connections dec where dec.most_recent_session_id = s.session_id and dec.most_recent_sql_handle is not null) AS dec OUTER APPLY sys.dm_exec_sql_text(COALESCE(er.sql_handle,dec.sql_handle)) AS t OUTER APPLY sys.dm_exec_query_plan(er.plan_handle) AS bqp OUTER APPLY sys.dm_exec_text_query_plan(er.plan_handle,er.statement_start_offset, er.statement_end_offset) as sqp LEFT JOIN ( select t.session_id, count(*) AS tasks from sys.dm_os_tasks t group by t.session_id) tsk on s.session_id = tsk.session_id OUTER APPLY ( select rgrp.name as [Pool] from sys.resource_governor_workload_groups rgwg join sys.resource_governor_resource_pools rgrp ON rgwg.pool_id = rgrp.pool_id where rgwg.group_id = er.group_id ) rp WHERE s.session_id != @@SPID AND ( (CASE WHEN s.session_id IN (select ri.blocking_session_id from sys.dm_exec_requests as ri) -- Get sessions involved in blocking (including system sessions) THEN 1 WHEN er.blocking_session_id IS NOT NULL AND er.blocking_session_id <> 0 THEN 1 ELSE 0 END) = 1 OR (CASE WHEN s.session_id > 50 AND er.session_id IS NOT NULL -- either some part of session has active request --AND ISNULL(open_resultset_count,0) > 0 -- some result is open AND s.status <> 'sleeping' THEN 1 ELSE 0 END) = 1 OR (CASE WHEN s.session_id > 50 AND s.open_transaction_count <> 0 THEN 1 ELSE 0 END) = 1 ); /* Get Metrics related to Memory/Blockings */ declare @object_name varchar(255); set @object_name = (case when @@SERVICENAME = 'MSSQLSERVER' then 'SQLServer' else 'MSSQL$'+@@SERVICENAME end); ;with t_PerfMon as ( --Total amount of RAM consumed by database data (Buffer Pool). This should be the highest usage of Memory on the server. Select SQLBufferPoolUsedMemoryMB = (Select SUM(pages_kb)/1024 AS [SPA Mem, Mb] FROM sys.dm_os_memory_clerks WITH (NOLOCK) Where type = 'MEMORYCLERK_SQLBUFFERPOOL') --Total amount of RAM used by SQL Server memory clerks (includes Buffer Pool) , SQLAllMemoryClerksUsedMemoryMB = (Select SUM(pages_kb)/1024 AS [SPA Mem, Mb] FROM sys.dm_os_memory_clerks WITH (NOLOCK)) --How long in seconds since data was removed from the Buffer Pool, to be replaced with data from disk. (Key indicator of memory pressure when below 300 consistently) ,[PageLifeExpectancy] = (SELECT cntr_value FROM sys.dm_os_performance_counters WITH (NOLOCK) WHERE [object_name] like (@object_name+':Buffer Manager%') AND counter_name = N'Page life expectancy' ) --How many memory operations are Pending (should always be 0, anything above 0 for extended periods of time is a very high sign of memory pressure) ,[MemoryGrantsPending] = (SELECT cntr_value FROM sys.dm_os_performance_counters WITH (NOLOCK) WHERE [object_name] LIKE (@object_name+':%Memory Manager%') AND counter_name = N'Memory Grants Pending' ) --How many memory operations are Outstanding (should always be 0, anything above 0 for extended periods of time is a very high sign of memory pressure) ,[MemoryGrantsOutstanding] = (SELECT cntr_value FROM sys.dm_os_performance_counters WITH (NOLOCK) WHERE [object_name] LIKE (@object_name+':Memory Manager%') AND counter_name = N'Memory Grants Outstanding' ) ) select 'Memory-Status' as RunningQuery, [Domain] = DEFAULT_DOMAIN(), [ServerName] = @@servername, [IP] = CONNECTIONPROPERTY('local_net_address'), -- [IsClustered/IsHadrEnabled] = (select CONVERT(varchar,SERVERPROPERTY('IsClustered'))+' / '+CONVERT(varchar,SERVERPROPERTY('IsHadrEnabled')) --from sys.dm_os_host_info), @current_time_UTC as [Current-Time-UTC], [MemoryGrantsPending] as [**M/r-Grants-Pending**], [M/r-Consumers] = convert(varchar,(select count(*) from #SysProcesses sp where (sp.granted_query_memory_kb/1024.0) >= @granted_memory_threshold_mb))+' Sessions (>='+convert(varchar,@granted_memory_threshold_mb)+'MB)', [**Blocking-Count**] = (select count(*) from #SysProcesses sp where sp.blocking_session_id <> 0 and sp.blocking_session_id <> sp.session_id), [PageLifeExpectancy], [CPU Count] = (select count(*) from sys.dm_os_schedulers as dos where dos.status IN ('VISIBLE ONLINE')), cast(sm.total_physical_memory_kb * 1.0 / 1024 / 1024 as numeric(20,0)) as total_box_memory_gb, cast(sm.available_physical_memory_kb * 1.0 / 1024 / 1024 as numeric(20,2)) as available_physical_memory_gb, cast((sm.total_page_file_kb - sm.available_page_file_kb) * 1.0 / 1024 / 1024 as numeric(20,0)) as used_page_file_gb, cast(sm.system_cache_kb * 1.0 / 1024 /1024 as numeric(20,2)) as system_cache_gb, cast((sm.available_physical_memory_kb - sm.system_cache_kb) * 1.0 / 1024 as numeric(20,2)) as free_memory_mb, cast(page_fault_count*8.0/1024/1024 as decimal(20,2)) as page_fault_gb, [MemoryGrantsOutstanding], SQLBufferPoolUsedMemoryMB, SQLAllMemoryClerksUsedMemoryMB from sys.dm_os_sys_memory as sm full outer join sys.dm_os_process_memory as pm on 1 = 1 full outer join t_PerfMon as pfm on 1 = 1; /* Get CPU Usage Trend at OS & SQL Server Level */ DECLARE @system_cpu_utilization VARCHAR(2000); DECLARE @sql_cpu_utilization VARCHAR(2000); ;WITH T_Cpu_Ring_Buffer AS ( SELECT EventTime, CASE WHEN system_cpu_utilization_post_sp2 IS NOT NULL THEN system_cpu_utilization_post_sp2 ELSE system_cpu_utilization_pre_sp2 END AS system_cpu_utilization, CASE WHEN sql_cpu_utilization_post_sp2 IS NOT NULL THEN sql_cpu_utilization_post_sp2 ELSE sql_cpu_utilization_pre_sp2 END AS sql_cpu_utilization ,ROW_NUMBER()OVER(PARTITION BY CAST(EventTime as smalldatetime) ORDER BY EventTime ASC) as cpu_minute_id FROM ( SELECT record.value('(Record/@id)[1]', 'int') AS record_id, DATEADD (ms, -1 * (ts_now - [timestamp]), GETDATE()) AS EventTime, 100-record.value('(Record/SchedulerMonitorEvent/SystemHealth/SystemIdle)[1]', 'int') AS system_cpu_utilization_post_sp2, record.value('(Record/SchedulerMonitorEvent/SystemHealth/ProcessUtilization)[1]', 'int') AS sql_cpu_utilization_post_sp2, 100-record.value('(Record/SchedluerMonitorEvent/SystemHealth/SystemIdle)[1]', 'int') AS system_cpu_utilization_pre_sp2, record.value('(Record/SchedluerMonitorEvent/SystemHealth/ProcessUtilization)[1]', 'int') AS sql_cpu_utilization_pre_sp2 FROM ( SELECT timestamp, CONVERT (xml, record) AS record, cpu_ticks / (cpu_ticks/ms_ticks) as ts_now FROM sys.dm_os_ring_buffers cross apply sys.dm_os_sys_info WHERE ring_buffer_type = 'RING_BUFFER_SCHEDULER_MONITOR' AND record LIKE '%<SystemHealth>%' ) AS t ) AS t WHERE EventTime >= DATEADD(minute,-@cpu_trend_minutes,getdate()) ) SELECT @system_cpu_utilization = COALESCE(@system_cpu_utilization+' <- '+STR(system_cpu_utilization,3,0), STR(system_cpu_utilization,3,0)), @sql_cpu_utilization = COALESCE(@sql_cpu_utilization+' <- '+STR(sql_cpu_utilization,3,0), STR(sql_cpu_utilization,3,0)) FROM T_Cpu_Ring_Buffer WHERE cpu_minute_id = 1 ORDER BY EventTime desc; SELECT [*********************************************** Ring Buffer CPU Utilization Trend **********************************************] = 'Local Time -> ' + CONVERT(varchar, getdate(), 21) + ' ' + 'UTC Time -> ' + CONVERT(varchar, cast(SYSUTCDATETIME() as datetime), 21) + ' Allocated Schedulers -> ' + (select cast(count(IIF(dos.status = 'VISIBLE ONLINE','sql',NULL)) as varchar)+' / '+cast(count(IIF(dos.status IN ('VISIBLE ONLINE','VISIBLE OFFLINE'),'all',NULL)) as varchar) from sys.dm_os_schedulers dos) UNION ALL SELECT [Info] = LEFT('OS CPU'+REPLICATE('_',20),10 ) + ' = ' + @system_cpu_utilization UNION ALL SELECT [Info] = LEFT('SQL CPU'+REPLICATE('_',20),10 ) + ' = ' + @sql_cpu_utilization; if (convert(int,left(@system_cpu_utilization, charindex('<',@system_cpu_utilization)-2)) > 50) begin select [RunningQuery] = 'Schedulers', parent_node_id, count(*) as scheduler_count, sum(convert(int,is_idle)) as idle_scheduler_count, sum(current_tasks_count) as current_tasks_count, sum(runnable_tasks_count) as runnable_tasks_count, sum(current_workers_count) as workers_count, sum(active_workers_count) as active_workers_count, sum(pending_disk_io_count) as pending_disk_io_count from sys.dm_os_schedulers where status = 'VISIBLE ONLINE' and is_online = 1 group by parent_node_id end /* Begin Code to find Resource Pool Scheduler Affinity */ set nocount on; if OBJECT_ID('tempdb..#resource_pool') is not null drop table #resource_pool; if OBJECT_ID('tempdb..#temp') is not null drop table #temp; create table #resource_pool (rpoolname sysname, scheduler_id int, cpu_id int); create table #temp (name sysname, pool_id int, scheduler_mask bigint); insert into #temp select rp.name,rp.pool_id,pa.scheduler_mask from sys.dm_resource_governor_resource_pools rp left join sys.resource_governor_resource_pool_affinity pa on rp.pool_id=pa.pool_id where rp.pool_id>2; if not exists (select * from #temp where scheduler_mask is not null) print 'WARNING: No Scheduler Affinity Defined'; else begin while((select count(1) from #temp) > 0) Begin declare @intvalue numeric,@rpoolname sysname declare @vsresult varchar(64) declare @inti numeric DECLARE @counter int=0 select @inti = 64, @vsresult = '' select top 1 @intvalue = scheduler_mask,@rpoolname = name from #temp while @inti>0 begin if(@intvalue %2 =1) BEGIN insert into #resource_pool(rpoolname,scheduler_id) values(@rpoolname,@counter) END select @intvalue = convert(bigint, (@intvalue / 2)), @inti=@inti-1 set @counter = @counter+1 end delete from #temp where name= @rpoolname End update rpl set rpl.cpu_id = dos.cpu_id from sys.dm_os_schedulers dos inner join #resource_pool rpl on dos.scheduler_id=rpl.scheduler_id end -- Insert schedulers NOT assigned to Any Pool, and still utilized by SQL Server insert into #resource_pool select 'REST' as rpoolname, dos.scheduler_id,dos.cpu_id from sys.dm_os_schedulers dos left join #resource_pool rpl on dos.scheduler_id = rpl.scheduler_id where rpl.scheduler_id is NULL and dos.status = 'VISIBLE ONLINE'; --select * from #resource_pool /* End Code to find Resource Pool Scheduler Affinity */ IF EXISTS (select * from sys.resource_governor_configuration where is_enabled = 1) BEGIN ;WITH T_Pools AS ( SELECT /* counter that require Fraction & Base */ 'Resource Pool CPU %' as RunningQuery, rtrim(fr.instance_name) as [Pool], [% CPU @Server-Level] = case when bs.cntr_value <> 0 then (100.0*((fr.cntr_value*1.0)/(bs.cntr_value*1.0))) else fr.cntr_value*1.0 end, [% CPU @SqlInstance-Level] = case when bs.cntr_value <> 0 then (100.0*((fr.cntr_value*1.0)/(bs.cntr_value*1.0*((1.0*dos.cpu_sql_counts)/(dos.cpu_total_counts*1.0))))) else fr.cntr_value*1.0 end, [% Schedulers@Total] = case when rp.Scheduler_Count <> 0 then (((rp.Scheduler_Count*1.0)/dos.cpu_total_counts)*100.0) else NULL end, [% Schedulers@Sql] = case when rp.Scheduler_Count <> 0 then (((rp.Scheduler_Count*1.0)/dos.cpu_sql_counts)*100.0) else NULL end, [Assigned Schedulers] = case when rp.Scheduler_Count <> 0 then rp.Scheduler_Count else null end ,dos.cpu_sql_counts ,dos.cpu_total_counts FROM sys.dm_os_performance_counters as fr JOIN (select count(1) as cpu_total_counts, sum(case when dos.status = 'VISIBLE ONLINE' then 1 else 0 end) as cpu_sql_counts from sys.dm_os_schedulers as dos where dos.status IN ('VISIBLE ONLINE','VISIBLE OFFLINE') ) AS dos ON 1 = 1 OUTER APPLY ( SELECT * FROM sys.dm_os_performance_counters as bs WHERE bs.cntr_type = 1073939712 /* PERF_LARGE_RAW_BASE */ AND bs.[object_name] = fr.[object_name] AND ( REPLACE(LOWER(RTRIM(bs.counter_name)),' base','') = REPLACE(LOWER(RTRIM(fr.counter_name)),' ratio','') OR REPLACE(LOWER(RTRIM(bs.counter_name)),' base','') = LOWER(RTRIM(fr.counter_name)) ) AND bs.instance_name = fr.instance_name ) as bs OUTER APPLY ( SELECT COUNT(*) as Scheduler_Count FROM #resource_pool AS rp WHERE rp.rpoolname = rtrim(fr.instance_name) ) as rp WHERE fr.cntr_type = 537003264 /* PERF_LARGE_RAW_FRACTION */ --and fr.cntr_value > 0.0 and ( ( fr.[object_name] like (@object_name+':Resource Pool Stats%') and fr.counter_name like 'CPU usage %' ) ) ) SELECT TOP 7 RunningQuery, @current_time_UTC as [Current-Time-UTC], [Pool], [% CPU @Pool-Level] = CONVERT(NUMERIC(20,2), CASE WHEN [Assigned Schedulers] IS NULL THEN NULL WHEN [% Schedulers@Sql] <> 0 THEN (([% CPU @SqlInstance-Level]*100.0)/([% Schedulers@Sql]*1.0)) ELSE [% CPU @SqlInstance-Level] END ), [% CPU @SqlInstance-Level] = CONVERT(numeric(20,2),[% CPU @SqlInstance-Level]), CONVERT(NUMERIC(20,2),[% CPU @Server-Level]) AS [% CPU @Server-Level], [Assigned Schedulers], p.cpu_sql_counts as [Sql Schedulers], p.cpu_total_counts as [Total Schedulers] ,( SELECT STUFF((SELECT ', ' + CAST(rp.scheduler_id as VARCHAR(3)) [text()] FROM #resource_pool as rp WHERE rp.rpoolname = [Pool] FOR XML PATH(''), TYPE) .value('.','NVARCHAR(MAX)'),1,2,' ' )) as [Schedulers] FROM T_Pools as p --,STUFF((SELECT ', ' + CAST(Value AS VARCHAR(10)) [text()] -- FROM @Table1 -- WHERE ID = t.ID -- FOR XML PATH(''), TYPE) -- .value('.','NVARCHAR(MAX)'),1,2,' ') List_Output WHERE NOT ([Assigned Schedulers] IS NULL AND [% CPU @Server-Level] = 0) ORDER BY [% CPU @SqlInstance-Level] desc, [% CPU @Server-Level] desc; END --SELECT scheduler_id,count(*) FROM #resource_pool AS rp group by scheduler_id IF (SELECT count(distinct rpoolname) FROM #resource_pool) < 2 SET @pool_name = NULL; ;WITH T_Requests AS ( SELECT [Pool], s.login_name, [program_name] = ltrim(rtrim(s.program_name)), --REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE (ltrim(rtrim(s.program_name)), '0', '#'),'1', '#'),'2', '#'),'3', '#'),'4', '#'),'5', '#'),'6', '#'),'7', '#'),'8', '#'),'9', '#') as program_name, r.session_id, r.request_id FROM sys.dm_exec_requests r JOIN sys.dm_exec_sessions s ON s.session_id = r.session_id OUTER APPLY ( select rgrp.name as [Pool] from sys.resource_governor_workload_groups rgwg join sys.resource_governor_resource_pools rgrp ON rgwg.pool_id = rgrp.pool_id where rgwg.group_id = s.group_id ) rp WHERE s.is_user_process = 1 --AND login_name NOT LIKE '%sqlexec%' AND (@pool_name is null or [Pool] = @pool_name ) ) ,T_Programs_Tasks_Total AS ( SELECT [Pool], login_name, [program_name] = ltrim(rtrim(r.program_name)), [active_request_counts] = COUNT(*), [num_tasks] = SUM(t.tasks) FROM T_Requests as r OUTER APPLY ( select count(*) AS tasks, count(distinct t.scheduler_id) as schedulers from sys.dm_os_tasks t where r.session_id = t.session_id --and r.request_id = t.request_id ) t GROUP BY [Pool], login_name, ltrim(rtrim(r.program_name)) ) ,T_Programs_Schedulers AS ( SELECT [Pool], login_name, [program_name] = ltrim(rtrim(r.program_name)), [num_schedulers] = COUNT(distinct t.scheduler_id) FROM T_Requests as r JOIN sys.dm_os_tasks t ON t.session_id = r.session_id AND t.request_id = r.request_id GROUP BY [Pool], login_name, ltrim(rtrim(r.program_name)) ) SELECT RunningQuery = (COALESCE(@pool_name,'ALL')+'-POOL/')+'Requests', @current_time_UTC as [Current-Time-UTC], ptt.[Pool], ptt.login_name, ptt.program_name, ptt.active_request_counts, ptt.num_tasks, ps.num_schedulers, [scheduler_percent] = case when @pool_name is not null then Floor(ps.num_schedulers * 100.0 / rp.Scheduler_Count) else Floor(ps.num_schedulers * 100.0 / (select count(*) from sys.dm_os_schedulers as os where os.status = 'VISIBLE ONLINE')) end FROM T_Programs_Tasks_Total as ptt JOIN T_Programs_Schedulers as ps ON ps.Pool = ptt.Pool AND ps.program_name = ptt.program_name and ps.login_name = ptt.login_name OUTER APPLY ( SELECT COUNT(*) as Scheduler_Count FROM #resource_pool AS rp WHERE rp.rpoolname = ptt.[Pool] ) as rp ORDER BY [Pool], [num_tasks] desc, active_request_counts desc, [scheduler_percent] desc OFFSET 0 ROWS FETCH NEXT @top_x_program_rows ROWS ONLY; -- Query to find what's running on server (Similar to sp_WhoIsActive) SELECT RunningQuery = 'Concurrent-Session-Queries', [Pool], [dd hh:mm:ss], [program_name], [login_name], [database_name], [command], [host_name], [query_count] = COUNT(*) OVER(PARTITION BY LEFT([sql_text],100)), [tasks_count] = SUM(tasks) OVER(PARTITION BY LEFT([sql_text],100)), --[tasks_count] = SUM(tasks) OVER(PARTITION BY Pool, LEFT(program_name,15), [DBName], LEFT(statement_text,100)), [session_id], request_id, [tasks], [status], [wait_type], [blocked by] = blocking_session_id, [open_tran], [granted_query_memory], [sql_text], [sql_command], [wait_time], [elapsed_time(S)] = DATEDIFF(SECOND,start_time,collection_time), [login_time], granted_query_memory, granted_query_memory_kb, [memusage], [writes], [reads], [is_user_process], [session_row_count], [request_row_count], [sql_handle], [plan_handle], [request_cpu_time], [request_start_time], [query_hash], [query_plan_hash] ,[BatchQueryPlan] = CASE WHEN @show_plan = 2 THEN [BatchQueryPlan] ELSE NULL END ,[SqlQueryPlan] = CASE WHEN @show_plan >= 1 THEN [SqlQueryPlan] ELSE NULL END ,collection_time_utc = @current_time_UTC FROM #SysProcesses ar WHERE @pool_name IS NULL -- No pool filter applied -- All sessions of Pool, or blockers of Pool session OR (ar.Pool = @pool_name OR ar.session_id IN (SELECT bl.[blocking_session_id] FROM #SysProcesses bl WHERE bl.Pool = @pool_name and ISNULL(bl.[blocking_session_id],0) <> 0) ) ORDER BY [tasks_count] desc, query_count desc, LEFT([sql_text],100), [request_start_time] OFFSET 0 ROWS FETCH NEXT @top_x_query_rows ROWS ONLY; IF ( ( (SELECT cntr_value FROM sys.dm_os_performance_counters WITH (NOLOCK) WHERE [object_name] LIKE (@object_name+':%Memory Manager%') AND counter_name = N'Memory Grants Pending' ) > 0 ) OR (EXISTS (select count(*) from #SysProcesses sp where (sp.granted_query_memory_kb/1024.0) >= @granted_memory_threshold_mb)) ) BEGIN -- Query to find what's running on server (Similar to sp_WhoIsActive) SELECT RunningQuery = 'Memory-Consumers (>='+convert(varchar,@granted_memory_threshold_mb)+'MB)', [Pool], [dd hh:mm:ss], [session_id], request_id, [command], granted_query_memory, [program_name], [login_name], [database_name], [host_name], [query_count] = COUNT(*) OVER(PARTITION BY LEFT([sql_text],100)), [tasks_count] = SUM(tasks) OVER(PARTITION BY LEFT([sql_text],100)), --[tasks_count] = SUM(tasks) OVER(PARTITION BY Pool, LEFT(program_name,15), [DBName], LEFT(statement_text,100)), [tasks], [status], [wait_type], [blocked by] = blocking_session_id, [open_tran], [granted_query_memory], [sql_text], [sql_command], [wait_time], [elapsed_time(S)] = DATEDIFF(SECOND,start_time,collection_time), [login_time], granted_query_memory_kb, [memusage], [writes], [reads], [is_user_process], [session_row_count], [request_row_count], [sql_handle], [plan_handle], [request_cpu_time], [request_start_time], [query_hash], [query_plan_hash] ,[BatchQueryPlan] = CASE WHEN @show_plan = 2 THEN [BatchQueryPlan] ELSE NULL END ,[SqlQueryPlan] = CASE WHEN @show_plan >= 1 THEN [SqlQueryPlan] ELSE NULL END ,collection_time_utc = @current_time_UTC FROM #SysProcesses ar WHERE ( @pool_name IS NULL -- No pool filter applied -- All sessions of Pool, or blockers of Pool session OR ( ar.Pool = @pool_name OR ar.session_id IN (SELECT bl.[blocking_session_id] FROM #SysProcesses bl WHERE bl.Pool = @pool_name and ISNULL(bl.[blocking_session_id],0) <> 0) ) ) AND ( (ar.granted_query_memory_kb/1024.0) >= @granted_memory_threshold_mb ) ORDER BY [granted_query_memory_kb] desc, [tasks_count] desc, query_count desc, LEFT([sql_text],100), [request_start_time] OFFSET 0 ROWS FETCH NEXT @top_x_query_rows ROWS ONLY; END -- Get Blocking Tree if exists (select * from #SysProcesses where blocking_session_id <> 0 and session_id <> blocking_session_id) begin ;WITH T_BLOCKERS AS ( -- Find block Leaders SELECT [dd hh:mm:ss], [collection_time], [session_id], [sql_text] = REPLACE(REPLACE(REPLACE(REPLACE(CAST(COALESCE([sql_command],[sql_text]) AS VARCHAR(MAX)),char(13),''),CHAR(10),''),'<?query --',''),'--?>',''), command, [login_name], wait_type, r.wait_time, r.wait_resource_type, [blocking_session_id], null as [blocked_session_count], [status], open_tran, [host_name], [database_name], [program_name], Pool, tasks, r.cpu, r.[tempdb_allocations], r.[tempdb_current], r.[reads], r.[writes], r.[physical_io], [LEVEL] = CAST (REPLICATE ('0', 4-LEN (CAST (r.session_id AS VARCHAR))) + CAST (r.session_id AS VARCHAR) AS VARCHAR (1000)) ,[head_blocker] = session_id FROM #SysProcesses AS r WHERE (ISNULL(r.blocking_session_id,0) = 0 OR ISNULL(r.blocking_session_id,0) = r.session_id) AND EXISTS (SELECT * FROM #SysProcesses AS R2 WHERE R2.collection_time = r.collection_time AND ISNULL(R2.blocking_session_id,0) = r.session_id AND ISNULL(R2.blocking_session_id,0) <> R2.session_id) -- UNION ALL -- SELECT r.[dd hh:mm:ss], r.[collection_time], r.[session_id], [sql_text] = REPLACE(REPLACE(REPLACE(REPLACE(CAST(COALESCE(r.[sql_command],r.[sql_text]) AS VARCHAR(MAX)),char(13),''),CHAR(10),''),'<?query --',''),'--?>',''), r.command, r.[login_name], r.wait_type, r.wait_time, r.wait_resource_type, r.[blocking_session_id], null as [blocked_session_count], r.[status], r.open_tran, r.[host_name], r.[database_name], r.[program_name], r.Pool, r.tasks, r.cpu, r.[tempdb_allocations], r.[tempdb_current], r.[reads], r.[writes], r.[physical_io], CAST (B.LEVEL + RIGHT (CAST ((1000 + r.session_id) AS VARCHAR (100)), 4) AS VARCHAR (1000)) AS LEVEL ,[head_blocker] = case when B.[head_blocker] is null then B.session_id else B.[head_blocker] end FROM #SysProcesses AS r INNER JOIN T_BLOCKERS AS B ON r.collection_time = B.collection_time AND r.blocking_session_id = B.session_id WHERE r.blocking_session_id <> r.session_id ) ,T_BlockingTree AS ( SELECT [dd hh:mm:ss], [BLOCKING_TREE] = N' ' + REPLICATE (N'| ', LEN (LEVEL)/4 - 1) + CASE WHEN (LEN(LEVEL)/4 - 1) = 0 THEN 'HEAD - ' ELSE '|------ ' END + CAST (r.session_id AS NVARCHAR (10)) + N' ' + ISNULL((CASE WHEN LEFT(ISNULL(r.[sql_text],''),1) = '(' THEN SUBSTRING(ISNULL(r.[sql_text],''),CHARINDEX('exec',ISNULL(r.[sql_text],'')),LEN(ISNULL(r.[sql_text],''))) ELSE ISNULL(r.[sql_text],'') END),''), [session_id], [blocking_session_id], --w.lock_text, [head_blocker], [blocked_session_count] = COUNT(*) OVER (PARTITION BY [head_blocker]), tasks, [sql_commad] = CONVERT(XML, '<?query -- '+char(13) + (CASE WHEN LEFT([sql_text],1) = '(' THEN SUBSTRING([sql_text],CHARINDEX('exec',[sql_text]),LEN([sql_text])) ELSE [sql_text] END) + char(13)+'--?>') ,command, [login_name], [program_name], [database_name], wait_type, wait_time, wait_resource_type, status, r.open_tran, r.cpu, r.[reads], r.[writes], r.[physical_io] ,[host_name] ,Pool ,LEVEL FROM T_BLOCKERS AS r ) SELECT Pool, [dd hh:mm:ss], [BLOCKING_TREE], [blocked_count] = case when session_id = [head_blocker] then [blocked_session_count] else null end, [sql_commad], [command], [login_name], [program_name], [database_name], [wait_type], --[wait_time], Concat ( RIGHT('00'+CAST(ISNULL(([wait_time] / 1000 / 3600 / 24), 0) AS VARCHAR(2)),2) ,' ' ,RIGHT('00'+CAST(ISNULL([wait_time] / 1000 / 3600 % 24, 0) AS VARCHAR(2)),2) ,':' ,RIGHT('00'+CAST(ISNULL([wait_time] / 1000 / 60 % 60, 0) AS VARCHAR(2)),2) ,':' ,RIGHT('00'+CAST(ISNULL([wait_time] / 1000 % 3600 % 60, 0) AS VARCHAR(2)),2) ,'.' ,RIGHT('00'+CAST(ISNULL([wait_time] / 1000 % 3600 % 60 % 1000, 0) AS VARCHAR(3)),3) ) as [wait_time], [wait_resource_type], [status], [open_tran], [cpu], [reads], [writes], [physical_io], [host_name] FROM T_BlockingTree t ORDER BY t.LEVEL; end -- Display Log Running Queries if exists (select * from #SysProcesses s where datediff(minute,s.start_time,s.collection_time) >= @long_running_query_threshold_minutes and (@pool_name is null or s.Pool = @pool_name) and s.session_id > 50 ) begin select RunningQuery = ISNULL(@pool_name+'-','')+'Running over '+cast(@long_running_query_threshold_minutes as varchar)+' minutes', @current_time_UTC as [Current-Time-UTC], Pool, * from #SysProcesses s where datediff(minute,s.start_time,s.collection_time) >= @long_running_query_threshold_minutes and (@pool_name is null or s.Pool = @pool_name) and s.session_id > 50 and s.program_name not in (N'Microsoft® Windows® Operating System') --and ( s.blocking_session_id <> 0 -- or exists (select * from #SysProcesses i where i.blocking_session_id = s.session_id) -- or (s.login_name <> 'sa' ) -- ) order by start_time asc OFFSET 0 ROWS FETCH NEXT @top_x_query_rows ROWS ONLY; end if @get_blitz_analysis = 1 begin if object_id('dbo.sp_BlitzFirst') is not null exec sp_BlitzFirst --@Seconds = 10, @ExpertMode = 1 if object_id('dbo.sp_BlitzWho') is not null exec sp_BlitzWho end IF @all_requests = 1 begin if @sort_order_all_sessions is null or len(ltrim(rtrim(@sort_order_all_sessions))) = 0 set @sort_order_all_sessions = '[elapsed_time_sec] desc, [granted_query_memory_kb] desc'; --select @sort_order_all_sessions, replace(replace(ltrim(rtrim(replace(replace(left(@sort_order_all_sessions,charindex(',',@sort_order_all_sessions)-1),' desc',''),' asc',''))),'[',''),']','') declare @sql nvarchar(max); set @sql = 'select RunningQuery = ''All-Sessions-SortedBy-'+(replace(replace(ltrim(rtrim(replace(replace(left(@sort_order_all_sessions,charindex(',',@sort_order_all_sessions)-1),' desc',''),' asc',''))),'[',''),']',''))+''', * from #SysProcesses' set @sql = @sql + char(10) + ' order by '+@sort_order_all_sessions; exec (@sql); end if @show_io_latency = 1 /* Delta IO Latency */ begin declare @wait_for_delay varchar(20); set @wait_for_delay = convert(varchar,dateadd(second,@io_snapshot_durations_seconds,'1900-01-01'),108); if OBJECT_ID('tempdb..#Snapshot') IS NOT NULL drop table #Snapshot; CREATE TABLE #Snapshot ( database_id SMALLINT NOT NULL, file_id SMALLINT NOT NULL, num_of_reads BIGINT NOT NULL, num_of_bytes_read BIGINT NOT NULL, io_stall_read_ms BIGINT NOT NULL, num_of_writes BIGINT NOT NULL, num_of_bytes_written BIGINT NOT NULL, io_stall_write_ms BIGINT NOT NULL ); INSERT INTO #Snapshot(database_id,file_id,num_of_reads,num_of_bytes_read ,io_stall_read_ms,num_of_writes,num_of_bytes_written,io_stall_write_ms) SELECT database_id,file_id,num_of_reads,num_of_bytes_read ,io_stall_read_ms,num_of_writes,num_of_bytes_written,io_stall_write_ms FROM sys.dm_io_virtual_file_stats(NULL,NULL) OPTION (RECOMPILE); -- Set test interval (1 minute). WAITFOR DELAY @wait_for_delay; ;WITH Stats(db_id, file_id, Reads, ReadBytes, Writes ,WrittenBytes, ReadStall, WriteStall) as ( SELECT s.database_id, s.file_id ,fs.num_of_reads - s.num_of_reads ,fs.num_of_bytes_read - s.num_of_bytes_read ,fs.num_of_writes - s.num_of_writes ,fs.num_of_bytes_written - s.num_of_bytes_written ,fs.io_stall_read_ms - s.io_stall_read_ms ,fs.io_stall_write_ms - s.io_stall_write_ms FROM #Snapshot s JOIN sys.dm_io_virtual_file_stats(NULL, NULL) fs ON s.database_id = fs.database_id and s.file_id = fs.file_id ) , StatsFormatted AS ( SELECT RunningQuery = convert(varchar,@io_snapshot_durations_seconds)+'-Seconds-IO-Stats', s.db_id AS [DB ID], d.name AS [Database] ,mf.name AS [File Name], mf.physical_name AS [File Path] ,mf.type_desc AS [Type], s.Reads ,CONVERT(DECIMAL(12,3), s.ReadBytes / 1048576.) AS [Read MB] ,CONVERT(DECIMAL(12,3), s.WrittenBytes / 1048576.) AS [Written MB] ,s.Writes, s.Reads + s.Writes AS [IO Count] ,CONVERT(DECIMAL(5,2),100.0 * s.ReadBytes / (s.ReadBytes + s.WrittenBytes)) AS [Read %] ,CONVERT(DECIMAL(5,2),100.0 * s.WrittenBytes / (s.ReadBytes + s.WrittenBytes)) AS [Write %] ,s.ReadStall AS [Read Stall] ,s.WriteStall AS [Write Stall] ,CASE WHEN s.Reads = 0 THEN 0.000 ELSE CONVERT(DECIMAL(12,3),1.0 * s.ReadStall / s.Reads) END AS [Avg Read Stall] ,CASE WHEN s.Writes = 0 THEN 0.000 ELSE CONVERT(DECIMAL(12,3),1.0 * s.WriteStall / s.Writes) END AS [Avg Write Stall] FROM Stats s JOIN sys.master_files mf WITH (NOLOCK) ON s.db_id = mf.database_id and s.file_id = mf.file_id JOIN sys.databases d WITH (NOLOCK) ON s.db_id = d.database_id WHERE -- Only display files with more than 20MB throughput (s.ReadBytes + s.WrittenBytes) > 20 * 1048576 ) SELECT * FROM StatsFormatted ORDER BY ([Avg Read Stall]+[Avg Write Stall]) desc OPTION (RECOMPILE); END go |
SQL Server Health Check Query Result 1
In the above script, lines 8-26 control the output of the health check query.
Typical result on a busy server –
ResultSet 1 ->
RunningQuery Memory-Status contains static & dynamic memory related information. Static metrics include domain, ip, server name, current time, cpu count & ram on server, Dynamic memory related information includes available memory on box, memory usage by SQL Server, Memory Grant Pending etc.
ResultSet 2 ->
This provides how CPU utilization looks on the server over time. By default, we look for the last 30 minutes of CPU trend which is controlled by the parameter @cpu_trend_minutes. Key point to note is the difference b/w OS CPU & SQL CPU. If there is a high gap, then non-SQL processes could be the reason for the high CPU utilization on the server.
ResultSet 3 ->
RunningQuery Schedulers provides how the distribution of CPU scheding looks like among various numa nodes. Uneven distribution of workers/tasks among various numa nodes indicates misconfiguration on server, or some bug.
ResultSet 4 ->
RunningQuery ALL-POOL/Requests resultset shows the distribution of cpu related metrics per program & login. If resource governor is configured with various resource pools, then it would segregate this info by pool. This resultset can be controlled to provide info only for a specific resource pool using parameter @pool_name. Output from this can indicate the top program/login causing HIGH CPU issues on box. For example, in the above screenshot, there are 100 active requests utilizing all 100% schedulers on my server which is the main cause of high CPU.
ResultSet 5 ->
RunningQuery Concurrent-Session-Queries result is useful when there is a high CPU issue on the server, and this might be happening to to one rougue application launch same concurrent query on multiple sessions. This output will inform you about the host_name, program, database, login having multiple sessions running similar query.
ResultSet 6 ->
RunningQuery Memory-Consumers (>=500.00MB) resultset is really useful in case the server is facing RESOURCE_SEMAPHORE waits, which means, there are some sessions having high memory grants, leading other sessions to suffer. Other sessions not even able to start due to memory not available inside sql server. This result has top memory consumers that needs to be killed in order to release server from memory pressure. The memory threshold can be controlled by parameter @granted_memory_threshold_mb.
ResultSet 7 ->
Shows the Blocking Tree including all the details of blocker & blocked sessions.
ResultSet 8 ->
RunningQuery Running over 10 minutes shows all requests/sessions that have been executing over @long_running_query_threshold_minutes. This result as usual includes all the session details.
ResultSet 9 ->
RunningQuery All-Sessions-SortedBy-cpu shows all the active requests/sessions sorted by CPU consumption. The sorting of this result again can be controlled by parameter @sort_order_all_sessions.
ResultSet 10 ->
RunningQuery 5-Seconds-IO-Stats shows IO Latency for database files having at least 20 MB of throughput. The snapshot duration for this result can be controlled by the parameter @io_snapshot_durations_seconds.
I hope this would be helpful to you DBAs out there.
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About The Author
Ajay Dwivedi
I am Microsoft Certified Professional having 10+ years of experience in SQL Server Querying, Database Design, and Administration. I am fond of Query Tuning and like to automate things using TSQL & PowerShell. I also have experience of implementing end-to-end Data Warehouse solution, and Data Migration using ETL tools SQL Server Integration Services (SSIS), Pentaho Business Analytics, and have designed Database Inventory through PowerShell, Python, and Django etc.
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How much is this compatible with Azure SQL database?
How much resources will be consumed on Azure in order to make SQLMonitor work? (will we incur in extra costs?)
I think this SQLMonitor might wake up Serverless instances on Azure, right?
Hi Francesco, I have not tested any of these tools/script on Azure. I mostly work on OnPrem or AWS EC2 machines.