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Alexander Shelemin
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Alexander Shelemin
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‎SQL Server 2012 Diagnostic Information Queries (July 2012).sql

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‎ask_brent.txt

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‎basicSQLserverchecks.txt

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/*******************************************************************************************************
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SQL SERVER - Initial Checks.
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********************************************************************************************************
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Description:
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Purpose:
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Author: Ian Stirk.
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Date: May 2013.
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Notes: 1. Some steps may fail if you dont have permissions.
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*********************************************************************************************************/
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-- Do not lock anything, and do not get held up by any locks.
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SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED
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-- Get SQL Version
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DECLARE @SQLVersion INT
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SELECT @SQLVersion = CAST(SUBSTRING(@@VERSION, 22, 4) AS INT) -- Example @@Version: Microsoft SQL Server 2008 (SP3) - 10.0.5768.0 (X64)
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-- This routine needs SQL Server 2005 or higher to run.
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IF @SQLVersion < 2005
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BEGIN
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RAISERROR('This routine needs SQL Server 2005 or higher to run. Routine has exited', 16,1)
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RETURN
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END
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-- Step counter value, used to separate pieces of outout.
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DECLARE @StepCounter AS INT
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SET @StepCounter = 0
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/************************************************************************************/
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/* */
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/* Purpose: Show datetime of run. */
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/* Notes: 1. xxxxx */
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/* */
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/************************************************************************************/
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SET @StepCounter = @StepCounter + 1
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SELECT 'Step ' + CAST(@StepCounter AS VARCHAR(10)) + ': ' + 'DateTime of run'
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SELECT CONVERT(VARCHAR(33), GetDate(), 109) AS RunDateTime
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/************************************************************************************/
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/* */
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/* Purpose: Show the version of SQL Server. */
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/* Notes: 1. Running the expected version of SQL Server? */
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/* */
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/************************************************************************************/
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SET @StepCounter = @StepCounter + 1
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SELECT 'Step ' + CAST(@StepCounter AS VARCHAR(10)) + ': ' + 'SQL Server version'
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SELECT @@VERSION
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/************************************************************************************/
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/* */
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/* Purpose: Get property info about server instance. */
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/* Notes: 1. IsIntegratedSecurityOnly: 1 = windows only */
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/* 2. ProductLevel - contains RTM or SP level. Is SP the correct one?! */
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/* 3. ProductVersion - major.minor.build */
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/* */
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/************************************************************************************/
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SET @StepCounter = @StepCounter + 1
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SELECT 'Step ' + CAST(@StepCounter AS VARCHAR(10)) + ': ' + 'Property info about server instance'
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SELECT SERVERPROPERTY('ServerName') AS [ServerName]
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,SERVERPROPERTY('InstanceName') AS [InstanceName]
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,SERVERPROPERTY('MachineName') AS [MachineName]
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,SERVERPROPERTY('Edition') AS [Edition]
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,SERVERPROPERTY('ProductVersion') AS [ProductVersion]
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,SERVERPROPERTY('ProductLevel') AS [ProductLevel]
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,SERVERPROPERTY('IsIntegratedSecurityOnly') AS [IsIntegratedSecurityOnly]
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,SERVERPROPERTY('IsClustered') AS [IsClustered]
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/************************************************************************************/
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/* */
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/* Purpose: Get OS information. */
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/* Notes: 1. CPU/Memory/last reboot time useful. */
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/* */
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/************************************************************************************/
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SET @StepCounter = @StepCounter + 1
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SELECT 'Step ' + CAST(@StepCounter AS VARCHAR(10)) + ': ' + 'OS information'
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SELECT cpu_count AS [Logical CPUs]
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, cpu_count / hyperthread_ratio AS [Physical CPUs]
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, CAST(physical_memory_kb / 1024.0 /1024.0 AS DECIMAL(28,2)) AS [Memory (GB)]
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, DATEADD(ss, -(ms_ticks / 1000), GetDate()) AS [Start DateTime]
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-- , sqlserver_start_time AS [Start DateTime] -- In 2008+
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FROM sys.dm_os_sys_info
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/************************************************************************************/
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/* */
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/* Purpose: Show SQL Server configuration info. */
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/* Notes: 1. priority boost - should be off (0) */
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/* 2. cost threshold for parallelism (evaluate with MAXDOP) */
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/* 3. max degree of parallelism (1 or 8?) */
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/* 4. max server memory (MB) - evaluate in context of server memory */
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/* 5. clr enabled - generally disable, unless needed */
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/* 6. optimize for ad hoc workloads - often recommended to have on. */
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/* */
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/************************************************************************************/
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SET @StepCounter = @StepCounter + 1
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SELECT 'Step ' + CAST(@StepCounter AS VARCHAR(10)) + ': ' + 'Configuration - specifics'
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SELECT name, description, value_in_use
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FROM sys.configurations
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WHERE NAME IN(
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'clr enabled'
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, 'max degree of parallelism'
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, 'cost threshold for parallelism'
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, 'max server memory (MB)' -- Set appropriately
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, 'optimize for ad hoc workloads' -- should be 1.
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, 'priority boost' -- should be 0
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)
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ORDER BY name
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/************************************************************************************/
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/* */
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/* Purpose: Identify what is causing the waits. */
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/* Notes: 1. Check Tom Davidson's 2005 article to decode WAIT Types. */
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/* */
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/************************************************************************************/
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SET @StepCounter = @StepCounter + 1
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SELECT 'Step ' + CAST(@StepCounter AS VARCHAR(10)) + ': ' + 'Most common waits'
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;WITH Waits AS
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(SELECT wait_type, wait_time_ms / 1000. AS wait_time_s,
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100. * wait_time_ms / SUM(wait_time_ms) OVER() AS pct,
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ROW_NUMBER() OVER(ORDER BY wait_time_ms DESC) AS rn
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FROM sys.dm_os_wait_stats
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WHERE wait_type NOT IN ('CLR_SEMAPHORE','LAZYWRITER_SLEEP','RESOURCE_QUEUE','SLEEP_TASK'
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,'SLEEP_SYSTEMTASK','SQLTRACE_BUFFER_FLUSH','WAITFOR', 'LOGMGR_QUEUE','CHECKPOINT_QUEUE'
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,'REQUEST_FOR_DEADLOCK_SEARCH','XE_TIMER_EVENT','BROKER_TO_FLUSH','BROKER_TASK_STOP','CLR_MANUAL_EVENT'
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,'CLR_AUTO_EVENT','DISPATCHER_QUEUE_SEMAPHORE', 'FT_IFTS_SCHEDULER_IDLE_WAIT'
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,'XE_DISPATCHER_WAIT', 'XE_DISPATCHER_JOIN', 'SQLTRACE_INCREMENTAL_FLUSH_SLEEP','ONDEMAND_TASK_QUEUE'))
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SELECT W1.wait_type,
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CAST(W1.wait_time_s AS DECIMAL(12, 2)) AS wait_time_s,
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CAST(W1.pct AS DECIMAL(12, 2)) AS pct,
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CAST(SUM(W2.pct) AS DECIMAL(12, 2)) AS running_pct
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FROM Waits AS W1
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INNER JOIN Waits AS W2
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ON W2.rn <= W1.rn
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GROUP BY W1.rn, W1.wait_type, W1.wait_time_s, W1.pct
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HAVING SUM(W2.pct) - W1.pct < 99; -- percentage threshold
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/************************************************************************************/
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/* */
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/* Purpose: Signal Waits - CPU pressure. */
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/* Notes: 1. How much time is spent swapping threads - above 20% is bad */
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/* */
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/************************************************************************************/
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SET @StepCounter = @StepCounter + 1
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SELECT 'Step ' + CAST(@StepCounter AS VARCHAR(10)) + ': ' + 'Signal Waits - CPU pressure'
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-- Signal Waits for instance
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SELECT CAST(100.0 * SUM(signal_wait_time_ms) / SUM (wait_time_ms) AS NUMERIC(20,2)) AS [%signal (cpu) waits],
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CAST(100.0 * SUM(wait_time_ms - signal_wait_time_ms) / SUM (wait_time_ms) AS NUMERIC(20,2)) AS [%resource waits]
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FROM sys.dm_os_wait_stats WITH (NOLOCK) OPTION (RECOMPILE);
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/************************************************************************************/
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/* */
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/* Purpose: Show SQL Server database info. */
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/* Notes: 1. Check compatibility level */
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/* 2. is_read_committed_snapshot_on (1 is good for concurrency) */
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/* 3. recovery_model (want simple on non-prod boxes. Bulk_logged for prod) */
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/* 4. page_verify - want CHECKSUM */
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/* */
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/************************************************************************************/
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SET @StepCounter = @StepCounter + 1
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SELECT 'Step ' + CAST(@StepCounter AS VARCHAR(10)) + ': ' + 'sys.databases'
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SELECT name, compatibility_level, recovery_model_desc, page_verify_option_desc, is_read_committed_snapshot_on
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FROM sys.databases ORDER BY name
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/************************************************************************************/
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/* */
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/* Purpose: CPU utilization usage per object database. */
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/* Notes: 1. Is a single DB hogging CPU? Maybe needs a separate server */
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/* */
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/************************************************************************************/
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SET @StepCounter = @StepCounter + 1
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SELECT 'Step ' + CAST(@StepCounter AS VARCHAR(10)) + ': ' + 'CPU usage by database'
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-- Get CPU utilization by database
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;WITH DB_CPU_Stats
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AS
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(SELECT DatabaseID, 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 F_DB
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GROUP BY DatabaseID)
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SELECT ROW_NUMBER() OVER(ORDER BY [CPU_Time_Ms] DESC) AS [row_num],
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DatabaseName, [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 [CPUPercent]
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FROM DB_CPU_Stats
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WHERE DatabaseID > 4 -- system databases
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AND DatabaseID <> 32767 -- ResourceDB
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ORDER BY [CPUPercent] DESC OPTION (RECOMPILE);
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/************************************************************************************/
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/* */
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/* Purpose: Memory usage per database. */
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/* Notes: 1. Is a single DB hogging memory? Maybe needs a separate server */
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/* */
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/************************************************************************************/
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SET @StepCounter = @StepCounter + 1
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SELECT 'Step ' + CAST(@StepCounter AS VARCHAR(10)) + ': ' + 'Memory usage by database'
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SELECT
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ISNULL(DB_NAME(database_id), 'ResourceDb') AS DatabaseName
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, CAST(COUNT(row_count) * 8.0 / (1024.0) AS DECIMAL(28,2)) AS [Size (MB)]
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, CAST(COUNT(row_count) * 8.0 / (1024.0) / 1024.0 AS DECIMAL(28,2)) AS [Size (GB)]
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FROM sys.dm_os_buffer_descriptors
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GROUP BY database_id
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ORDER BY [Size (MB)] DESC

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