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SQL Server 2012 Diagnostic Information Queries.sql
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SQL Server 2012 Diagnostic Information Queries.sql
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-- SQL Server 2012 Diagnostic Information Queries
-- Glenn Berry
-- Last Modified: December 4, 2019
-- https://www.sqlskills.com/blogs/glenn/
-- http://sqlserverperformance.wordpress.com/
-- Twitter: GlennAlanBerry
-- Please listen to my Pluralsight courses
-- https://www.pluralsight.com/author/glenn-berry
-- If you want to find all of our SQLskills SQL101 blog posts, check out https://www.sqlskills.com/help/sql101/
-- Please make sure you are using the correct version of these diagnostic queries for your version of SQL Server
-- If you like PowerShell, there is a very useful community solution for running these queries in an automated fashion
-- https://dbatools.io/
-- Invoke-DbaDiagnosticQuery
-- https://dbatools.io/functions/invoke-dbadiagnosticquery/
--******************************************************************************
--* Copyright (C) 2019 Glenn Berry, SQLskills.com
--* All rights reserved.
--*
--* For more scripts and sample code, check out
--* https://www.sqlskills.com/blogs/glenn
--*
--* You may alter this code for your own *non-commercial* purposes. You may
--* republish altered code as long as you include this copyright and give due credit.
--*
--*
--* THIS CODE AND INFORMATION ARE PROVIDED "AS IS" WITHOUT WARRANTY OF
--* ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED
--* TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
--* PARTICULAR PURPOSE.
--*
--******************************************************************************
-- Check the major product version to see if it is SQL Server 2012
IF NOT EXISTS (SELECT * WHERE CONVERT(varchar(128), SERVERPROPERTY('ProductVersion')) LIKE '11%')
BEGIN
DECLARE @ProductVersion varchar(128) = CONVERT(varchar(128), SERVERPROPERTY('ProductVersion'));
RAISERROR ('Script does not match the ProductVersion [%s] of this instance. Many of these queries may not work on this version.' , 18 , 16 , @ProductVersion);
END
ELSE
PRINT N'You have the correct major version of SQL Server for this diagnostic information script';
-- Instance level queries *******************************
-- SQL and OS Version information for current instance (Query 1) (Version Info)
SELECT @@SERVERNAME AS [Server Name], @@VERSION AS [SQL Server and OS Version Info];
------
-- SQL Server 2012 RTM Branch Builds SQL Server 2012 SP1 Branch Builds SQL Server 2012 SP2 Branch Builds SQL Server 2012 SP3 Branch Builds SQL Server 2012 SP4 Branch Builds
-- Build Description Release Date Build Description Release Date Build Description Release Date Build Description Release Date Build Description Release Date
-- 11.0.2100 RTM 3/6/2012
-- 11.0.2316 RTM CU1 4/12/2012
-- 11.0.2325 RTM CU2 6/18/2012 --> 11.0.3000 SP1 RTM 11/7/2012
-- 11.0.2332 RTM CU3 8/31/2012
-- 11.0.2376 RTM CU3 + QFE 10/9/2012
-- 11.0.2383 RTM CU4 10/15/2012 --> 11.0.3321 SP1 CU1 11/20/2012
-- 11.0.2395 RTM CU5 12/17/2012 --> 11.0.3339 SP1 CU2 1/21/2013
-- 11.0.2401 RTM CU6 2/18/2013 --> 11.0.3349 SP1 CU3 3/18/2013
-- 11.0.2405 RTM CU7 4/15/2013 --> 11.0 3368 SP1 CU4 5/30/2013
-- 11.0.2410 RTM CU8 6/17/2013 --> 11.0.3373 SP1 CU5 7/15/2013
-- 11.0.2419 RTM CU9 8/20/2013 --> 11.0.3381 SP1 CU6 9/16/2013
-- 11.0.2420 RTM CU10 10/21/2013 --> 11.0.3393 SP1 CU7 11/18/2013
-- 11.0.2424 RTM CU11 12/16/2003 --> 11.0.3401 SP1 CU8 1/20/2014
-- 11.0.3412 SP1 CU9 3/17/2014 --> 11.0.5058 SP2 RTM 6/10/2014
-- 11.0.3431 SP1 CU10 5/19/2014
-- 11.0.3449 SP1 CU11 7/21/2014 --> 11.0.5532 SP2 CU1 7/23/2014
-- 11.0.3470 SP1 CU12 9/15/2014 --> 11.0.5548 SP2 CU2 9/15/2014
-- 11.0.3482 SP1 CU13 11/17/2014--> 11.0.5556 SP2 CU3 11/17/2014
-- 11.0.3486 SP1 CU14 1/19/2015 --> 11.0.5569 SP2 CU4 1/19/2015
-- 11.0.5571 SP2 CU4 + COD HF 2/4/2015
-- 11.0.3487 SP1 CU15 3/16/2015 --> 11.0.5582 SP2 CU5 3/16/2015
-- 11.0.3492 SP1 CU16 5/18/2015 --> 11.0.5592 SP2 CU6 5/18/2015
-- 11.0.5623 SP2 CU7 7/20/2015
-- 11.0.5634 SP2 CU8 9/21/2015
-- 11.0.5641 SP2 CU9 11/16/2015 ----> 11.0.6020 SP3 RTM 11/21/2015
-- 11.0.5644 SP2 CU10 1/18/2016 ----> 11.0.6518 SP3 CU1 1/18/2016
-- 11.0.5646 SP2 CU11 3/21/2016 ----> 11.0.6523 SP3 CU2 3/21/2016
-- 11.0.5649 SP2 CU12 5/16/2016 ----> 11.0.6537 SP3 CU3 5/16/2016
-- 11.0.5655 SP2 CU13 7/18/2016 ----> 11.0.6540 SP3 CU4 7/18/2016
-- 11.0.5657 SP2 CU14 9/19/2016 ----> 11.0.6544 SP3 CU5 9/20/2016
-- 11.0.5676 SP2 CU15 11/16/2016 ----> 11.0.6567 SP3 CU6 11/16/2016
-- 11.0.5678 SP2 CU16 1/17/2017 ----> 11.0.6579 SP3 CU7 1/17/2017
-- 11.0.6594 SP3 CU8 3/20/2017
-- 11.0.6598 SP3 CU9 5/15/2017
-- 11.0.6607 SP3 CU10 8/8/2017
-- 11.0.7001 SP4 RTM 10/3/2017
--
-- Security Update for SQL Server 2012 SP4 (KB4057116)
-- https://bit.ly/2F33Sc4
-- 11.0.7462 Security Update 1/12/2018 (Security Update for SQL Server 2012 SP4 (KB4057116))
-- SQL Server 2012 Service Pack 4 (SP4) Released!
-- https://bit.ly/2qN8kr3
-- How to determine the version, edition and update level of SQL Server and its components
-- https://bit.ly/2oAjKgW
-- SQL Server 2012 SP3 build versions
-- https://bit.ly/2HFjAzA
-- SQL Server 2012 SP2 build versions
-- https://bit.ly/2qLqqcS
-- The SQL Server 2012 builds that were released after SQL Server 2012 Service Pack 1 was released
-- https://bit.ly/2HG21za
-- The SQL Server 2012 builds that were released after SQL Server 2012 was released
-- https://bit.ly/2K1xZnX
-- Where to find information about the latest SQL Server builds
-- https://bit.ly/2IGHbfY
-- Recommended updates and configuration options for SQL Server 2012 and SQL Server 2014 used with high-performance workloads
-- https://bit.ly/2Hy3zIZ
-- Performance and Stability Related Fixes in Post-SQL Server 2012 SP3 Builds
-- https://bit.ly/2woDJ4Z
-- Performance and Stability Related Fixes in Post-SQL Server 2012 SP2 Builds
-- https://bit.ly/2vuKZzp
-- Performance and Stability Related Fixes in Post-SQL Server 2012 SP1 Builds
-- https://bit.ly/2vBt1LC
-- Performance Related Fixes in Post-SQL Server 2012 RTM Builds
-- https://bit.ly/2vuIQn4
-- Update Center for Microsoft SQL Server
-- https://bit.ly/2pZptuQ
-- Download SQL Server Management Studio (SSMS)
-- https://bit.ly/1OcupT9
-- Download and install Azure Data Studio
-- https://bit.ly/2vgke1A
-- SQL Server 2012 Configuration Manager is SQLServerManager11.msc
-- Get socket, physical core and logical core count from the SQL Server Error log. (Query 2) (Core Counts)
-- This query might take a few seconds depending on the size of your error log
EXEC sys.xp_readerrorlog 0, 1, N'detected', N'socket';
------
-- This can help you determine the exact core counts used by SQL Server and whether HT is enabled or not
-- It can also help you confirm your SQL Server licensing model
-- Be on the lookout for this message "using 40 logical processors based on SQL Server licensing"
-- (when you have more than 40 logical cores) which means grandfathered Server/CAL licensing
-- This query will return no results if your error log has been recycled since the instance was last started
-- New in SQL Server 2012 SP4
-- Get selected server properties (Query 3) (Server Properties)
SELECT SERVERPROPERTY('MachineName') AS [MachineName],
SERVERPROPERTY('ServerName') AS [ServerName],
SERVERPROPERTY('InstanceName') AS [Instance],
SERVERPROPERTY('IsClustered') AS [IsClustered],
SERVERPROPERTY('ComputerNamePhysicalNetBIOS') AS [ComputerNamePhysicalNetBIOS],
SERVERPROPERTY('Edition') AS [Edition],
SERVERPROPERTY('ProductLevel') AS [ProductLevel], -- What servicing branch (RTM/SP/CU)
SERVERPROPERTY('ProductUpdateLevel') AS [ProductUpdateLevel], -- Within a servicing branch, what CU# is applied
SERVERPROPERTY('ProductVersion') AS [ProductVersion],
SERVERPROPERTY('ProductMajorVersion') AS [ProductMajorVersion],
SERVERPROPERTY('ProductMinorVersion') AS [ProductMinorVersion],
SERVERPROPERTY('ProductBuild') AS [ProductBuild],
SERVERPROPERTY('ProductBuildType') AS [ProductBuildType], -- Is this a GDR or OD hotfix (NULL if on a CU build)
SERVERPROPERTY('ProductUpdateReference') AS [ProductUpdateReference], -- KB article number that is applicable for this build
SERVERPROPERTY('ProcessID') AS [ProcessID],
SERVERPROPERTY('Collation') AS [Collation],
SERVERPROPERTY('IsFullTextInstalled') AS [IsFullTextInstalled],
SERVERPROPERTY('IsIntegratedSecurityOnly') AS [IsIntegratedSecurityOnly],
SERVERPROPERTY('FilestreamConfiguredLevel') AS [FilestreamConfiguredLevel],
SERVERPROPERTY('IsHadrEnabled') AS [IsHadrEnabled],
SERVERPROPERTY('HadrManagerStatus') AS [HadrManagerStatus],
SERVERPROPERTY('InstanceDefaultDataPath') AS [InstanceDefaultDataPath],
SERVERPROPERTY('InstanceDefaultLogPath') AS [InstanceDefaultLogPath],
SERVERPROPERTY('BuildClrVersion') AS [Build CLR Version];
------
-- This gives you a lot of useful information about your instance of SQL Server,
-- such as the ProcessID for SQL Server and your collation
-- Note: Some columns will be NULL on older SQL Server builds
-- SERVERPROPERTY (Transact-SQL)
-- https://bit.ly/2eeaXeI
-- Get instance-level configuration values for instance (Query 4) (Configuration Values)
SELECT name, value, value_in_use, minimum, maximum, [description], is_dynamic, is_advanced
FROM sys.configurations WITH (NOLOCK)
ORDER BY name OPTION (RECOMPILE);
------
-- Focus on these settings:
-- backup compression default (should be 1 in most cases)
-- clr enabled (only enable if it is needed)
-- cost threshold for parallelism (depends on your workload)
-- lightweight pooling (should be zero)
-- max degree of parallelism (depends on your workload and hardware)
-- max server memory (MB) (set to an appropriate value, not the default)
-- optimize for ad hoc workloads (should be 1)
-- priority boost (should be zero)
-- remote admin connections (should be 1)
-- Returns a list of all global trace flags that are enabled (Query 5) (Global Trace Flags)
DBCC TRACESTATUS (-1);
------
-- If no global trace flags are enabled, no results will be returned.
-- It is very useful to know what global trace flags are currently enabled as part of the diagnostic process.
-- Common trace flags that should be enabled in most cases
-- TF 1117 - When growing a data file, grow all files at the same time so they remain the same size, reducing allocation contention points
-- https://bit.ly/2GY1kOl
--
-- TF 1118 - Helps alleviate allocation contention in tempdb, SQL Server allocates full extents to each database object,
-- thereby eliminating the contention on SGAM pages (more important with older versions of SQL Server)
-- Recommendations to reduce allocation contention in SQL Server tempdb database
-- https://bit.ly/2GY1kOl
-- TF 2371 - Lowers auto update statistics threshold for large tables (on tables with more than 25,000 rows)
-- https://bit.ly/2HySkAg
-- TF 3023 - Enables backup checksum default
-- https://bit.ly/2vtjqqc
-- TF 3226 - Supresses logging of successful database backup messages to the SQL Server Error Log
-- https://bit.ly/2p6MTjS
-- TF 3449 - Enables use of dirty page manager (SQL Server 2012 SP3 CU3 and later)
-- https://bit.ly/2uj0h5M
-- TF 6533 - Spatial performance improvements in SQL Server 2012 and 2014
-- https://bit.ly/2v7C7ze
-- TF 6534 - Enables use of native code to improve performance with spatial data
-- https://bit.ly/2HrQUpU
-- TF 8079 - Enables automatic soft-NUMA on systems with eight or more physical cores per NUMA node (with SQL Server 2012 SP4)
-- https://bit.ly/2qN8kr3
-- DBCC TRACEON - Trace Flags (Transact-SQL)
-- https://bit.ly/2FuSvPg
-- Returns status of instant file initialization (Query 6) (IFI Status)
EXEC sys.xp_readerrorlog 0, 1, N'Database Instant File Initialization';
------
-- Lets you determine whether Instant File Initialization (IFI) is enabled for the instance
-- This should be enabled in the vast majority of cases
-- (Added in SQL Server 2012 SP4)
-- Database Instant File Initialization
-- https://bit.ly/2nTX74y
-- Misconceptions around instant file initialization
-- https://bit.ly/2oBSKgZ
-- SQL Server Process Address space info (Query 7) (Process Memory)
-- (shows whether locked pages is enabled, among other things)
SELECT physical_memory_in_use_kb/1024 AS [SQL Server Memory Usage (MB)],
locked_page_allocations_kb/1024 AS [SQL Server Locked Pages Allocation (MB)],
large_page_allocations_kb/1024 AS [SQL Server Large Pages Allocation (MB)],
page_fault_count, memory_utilization_percentage, available_commit_limit_kb,
process_physical_memory_low, process_virtual_memory_low
FROM sys.dm_os_process_memory WITH (NOLOCK) OPTION (RECOMPILE);
------
-- You want to see 0 for process_physical_memory_low
-- You want to see 0 for process_virtual_memory_low
-- This indicates that you are not under internal memory pressure
-- If locked_page_allocations_kb > 0, then LPIM is enabled
-- How to enable the "locked pages" feature in SQL Server 2012
-- https://bit.ly/2F5UjOA
-- Memory Management Architecture Guide
-- https://bit.ly/2JKkadC
-- SQL Server Services information (Query 8) (SQL Server Services Info)
SELECT servicename, process_id, startup_type_desc, status_desc,
last_startup_time, service_account, is_clustered, cluster_nodename, [filename]
FROM sys.dm_server_services WITH (NOLOCK) OPTION (RECOMPILE);
------
-- Tells you the account being used for the SQL Server Service and the SQL Agent Service
-- Shows the process_id, when they were last started, and their current status
-- Also shows whether you are running on a failover cluster instance, and what node you are running on
-- sys.dm_server_services (Transact-SQL)
-- https://bit.ly/2oKa1Un
-- Last backup information by database (Query 9) (Last Backup By Database)
SELECT ISNULL(d.[name], bs.[database_name]) AS [Database], d.recovery_model_desc AS [Recovery Model],
d.log_reuse_wait_desc AS [Log Reuse Wait Desc],
MAX(CASE WHEN [type] = 'D' THEN bs.backup_finish_date ELSE NULL END) AS [Last Full Backup],
MAX(CASE WHEN [type] = 'I' THEN bs.backup_finish_date ELSE NULL END) AS [Last Differential Backup],
MAX(CASE WHEN [type] = 'L' THEN bs.backup_finish_date ELSE NULL END) AS [Last Log Backup]
FROM sys.databases AS d WITH (NOLOCK)
LEFT OUTER JOIN msdb.dbo.backupset AS bs WITH (NOLOCK)
ON bs.[database_name] = d.[name]
AND bs.backup_finish_date > GETDATE()- 30
WHERE d.name <> N'tempdb'
GROUP BY ISNULL(d.[name], bs.[database_name]), d.recovery_model_desc, d.log_reuse_wait_desc, d.[name]
ORDER BY d.recovery_model_desc, d.[name] OPTION (RECOMPILE);
------
-- This helps you spot runaway transaction logs and other issues with your backup schedule
-- Get SQL Server Agent jobs and Category information (Query 10) (SQL Server Agent Jobs)
SELECT sj.name AS [Job Name], sj.[description] AS [Job Description], SUSER_SNAME(sj.owner_sid) AS [Job Owner],
sj.date_created AS [Date Created], sj.[enabled] AS [Job Enabled],
sj.notify_email_operator_id, sj.notify_level_email, sc.name AS [CategoryName],
s.[enabled] AS [Sched Enabled], js.next_run_date, js.next_run_time
FROM msdb.dbo.sysjobs AS sj WITH (NOLOCK)
INNER JOIN msdb.dbo.syscategories AS sc WITH (NOLOCK)
ON sj.category_id = sc.category_id
LEFT OUTER JOIN msdb.dbo.sysjobschedules AS js WITH (NOLOCK)
ON sj.job_id = js.job_id
LEFT OUTER JOIN msdb.dbo.sysschedules AS s WITH (NOLOCK)
ON js.schedule_id = s.schedule_id
ORDER BY sj.name OPTION (RECOMPILE);
------
-- Gives you some basic information about your SQL Server Agent jobs, who owns them and how they are configured
-- Look for Agent jobs that are not owned by sa
-- Look for jobs that have a notify_email_operator_id set to 0 (meaning no operator)
-- Look for jobs that have a notify_level_email set to 0 (meaning no e-mail is ever sent)
--
-- MSDN sysjobs documentation
-- https://bit.ly/2paDEOP
-- SQL Server Maintenance Solution
-- https://bit.ly/1pgchQu
-- Get SQL Server Agent Alert Information (Query 11) (SQL Server Agent Alerts)
SELECT name, event_source, message_id, severity, [enabled], has_notification,
delay_between_responses, occurrence_count, last_occurrence_date, last_occurrence_time
FROM msdb.dbo.sysalerts WITH (NOLOCK)
ORDER BY name OPTION (RECOMPILE);
------
-- Gives you some basic information about your SQL Server Agent Alerts (which are different from SQL Server Agent jobs)
-- Read more about Agent Alerts here: https://bit.ly/2Giz0Xf
-- Windows information (Query 12) (Windows Info)
SELECT windows_release, windows_service_pack_level,
windows_sku, os_language_version
FROM sys.dm_os_windows_info WITH (NOLOCK) OPTION (RECOMPILE);
------
-- Gives you major OS version, Service Pack, Edition, and language info for the operating system
-- 10.0 is either Windows 10 or Windows Server 2016
-- 6.3 is either Windows 8.1, or Windows Server 2012 R2
-- 6.2 is either Windows 8 or Windows Server 2012
-- 6.1 is either Windows 7 or Windows Server 2008 R2
-- 6.0 is either Windows Vista or Windows Server 2008
-- Windows SKU codes
-- 4 is Enterprise Edition
-- 7 is Standard Server Edition
-- 8 is Datacenter Server Edition
-- 10 is Enterprise Server Edition
-- 48 is Professional Edition
-- 161 is Pro for Workstations
-- 1033 for os_language_version is US-English
-- SQL Server 2012 requires Windows Server 2008 SP2 or newer
-- Hardware and Software Requirements for Installing SQL Server 2012
-- https://bit.ly/1yRYXkQ
-- Using SQL Server in Windows 8 and later versions of Windows operating system
-- https://bit.ly/2F7Ax0P
-- SQL Server NUMA Node information (Query 13) (SQL Server NUMA Info)
SELECT node_id, node_state_desc, memory_node_id, processor_group, online_scheduler_count,
idle_scheduler_count, active_worker_count, avg_load_balance, resource_monitor_state
FROM sys.dm_os_nodes WITH (NOLOCK)
WHERE node_state_desc <> N'ONLINE DAC' OPTION (RECOMPILE);
------
-- Gives you some useful information about the composition and relative load on your NUMA nodes
-- You want to see an equal number of schedulers on each NUMA node
-- Watch out if SQL Server 2012 Standard Edition has been installed
-- on a physical or virtual machine with more than four sockets or more than 16 physical cores
-- sys.dm_os_nodes (Transact-SQL)
-- https://bit.ly/2pn5Mw8
-- Balancing Your Available SQL Server Core Licenses Evenly Across NUMA Nodes
-- https://bit.ly/2vfC4Rq
-- Good basic information about OS memory amounts and state (Query 14) (System Memory)
SELECT total_physical_memory_kb/1024 AS [Physical Memory (MB)],
available_physical_memory_kb/1024 AS [Available Memory (MB)],
total_page_file_kb/1024 AS [Total Page File (MB)],
available_page_file_kb/1024 AS [Available Page File (MB)],
system_cache_kb/1024 AS [System Cache (MB)],
system_memory_state_desc AS [System Memory State]
FROM sys.dm_os_sys_memory WITH (NOLOCK) OPTION (RECOMPILE);
------
-- You want to see "Available physical memory is high" for System Memory State
-- This indicates that you are not under external memory pressure
-- Possible System Memory State values:
-- Available physical memory is high
-- Physical memory usage is steady
-- Available physical memory is low
-- Available physical memory is running low
-- Physical memory state is transitioning
-- sys.dm_os_sys_memory (Transact-SQL)
-- https://bit.ly/2pcV0xq
-- You can skip the next two queries if you know you don't have a clustered instance
-- Get information about your cluster nodes and their status (Query 15) (Cluster Node Properties)
-- (if your database server is in a failover cluster)
SELECT NodeName, status_description, is_current_owner
FROM sys.dm_os_cluster_nodes WITH (NOLOCK) OPTION (RECOMPILE);
------
-- Knowing which node owns the cluster resources is critical
-- Especially when you are installing Windows or SQL Server updates
-- You will see no results if your instance is not clustered
-- Recommended hotfixes and updates for Windows Server 2012 R2-based failover clusters
-- https://bit.ly/1z5BfCw
-- Get information about any AlwaysOn AG cluster this instance is a part of (Query 16) (AlwaysOn AG Cluster)
SELECT cluster_name, quorum_type_desc, quorum_state_desc
FROM sys.dm_hadr_cluster WITH (NOLOCK) OPTION (RECOMPILE);
------
-- You will see no results if your instance is not using AlwaysOn AGs
-- Hardware information from SQL Server 2012 (Query 17) (Hardware Info)
SELECT cpu_count AS [Logical CPU Count], scheduler_count,
hyperthread_ratio AS [Hyperthread Ratio],
cpu_count/hyperthread_ratio AS [Physical CPU Count],
physical_memory_kb/1024 AS [Physical Memory (MB)],
committed_kb/1024 AS [Committed Memory (MB)],
committed_target_kb/1024 AS [Committed Target Memory (MB)],
max_workers_count AS [Max Workers Count],
affinity_type_desc AS [Affinity Type],
sqlserver_start_time AS [SQL Server Start Time],
DATEDIFF(hour, sqlserver_start_time, GETDATE()) AS [SQL Server Up Time (hrs)],
virtual_machine_type_desc AS [Virtual Machine Type]
FROM sys.dm_os_sys_info WITH (NOLOCK) OPTION (RECOMPILE);
------
-- Gives you some good basic hardware information about your database server
-- Cannot distinguish between HT and multi-core
-- Note: virtual_machine_type_desc of HYPERVISOR does not automatically mean you are running SQL Server inside of a VM
-- It merely indicates that you have a hypervisor running on your host
-- sys.dm_os_sys_info (Transact-SQL)
-- https://bit.ly/2pczOYs
-- Get System Manufacturer and model number from SQL Server Error log (Query 18) (System Manufacturer)
EXEC sys.xp_readerrorlog 0, 1, N'Manufacturer';
------
-- This can help you determine the capabilities and capacities of your database server
-- Can also be used to confirm if you are running in a VM
-- This query might take a few seconds if you have not recycled your error log recently
-- This query will return no results if your error log has been recycled since the instance was started
-- Get pvscsi info from Windows Registry (Query 19) (PVSCSI Driver Parameters)
EXEC sys.xp_instance_regread N'HKEY_LOCAL_MACHINE', N'SYSTEM\CurrentControlSet\services\pvscsi\Parameters\Device', N'DriverParameter';
------
-- This is valid for VMware VMs
-- Recommended value for intensive I/O patterns from VMware is: RequestRingPages=32,MaxQueueDepth=254
-- https://kb.vmware.com/s/article/2053145
-- Get BIOS date from Windows Registry (Query 20) (BIOS Date)
EXEC sys.xp_instance_regread N'HKEY_LOCAL_MACHINE', N'HARDWARE\DESCRIPTION\System\BIOS', N'BiosReleaseDate';
------
-- Helps you understand whether the main system BIOS is up to date, and the possible age of the hardware
-- Not as useful for virtualization
-- Get processor description from Windows Registry (Query 21) (Processor Description)
EXEC sys.xp_instance_regread N'HKEY_LOCAL_MACHINE', N'HARDWARE\DESCRIPTION\System\CentralProcessor\0', N'ProcessorNameString';
------
-- Gives you the model number and rated clock speed of your processor(s)
-- Your processors may be running at less than the rated clock speed due
-- to the Windows Power Plan or hardware power management
-- You can use CPU-Z to get your actual CPU core speed and a lot of other useful information
-- https://bit.ly/QhR6xF
-- You can learn more about processor selection for SQL Server by following this link
-- https://bit.ly/2F3aVlP
-- Get information on location, time and size of any memory dumps from SQL Server (Query 22) (Memory Dump Info)
SELECT [filename], creation_time, size_in_bytes/1048576.0 AS [Size (MB)]
FROM sys.dm_server_memory_dumps WITH (NOLOCK)
ORDER BY creation_time DESC OPTION (RECOMPILE);
------
-- This will not return any rows if you have
-- not had any memory dumps (which is a good thing)
-- sys.dm_server_memory_dumps (Transact-SQL)
-- https://bit.ly/2elwWll
-- Look at Suspect Pages table (Query 23) (Suspect Pages)
SELECT DB_NAME(database_id) AS [Database Name], [file_id], page_id,
event_type, error_count, last_update_date
FROM msdb.dbo.suspect_pages WITH (NOLOCK)
ORDER BY database_id OPTION (RECOMPILE);
------
-- event_type value descriptions
-- 1 = 823 error caused by an operating system CRC error
-- or 824 error other than a bad checksum or a torn page (for example, a bad page ID)
-- 2 = Bad checksum
-- 3 = Torn page
-- 4 = Restored (The page was restored after it was marked bad)
-- 5 = Repaired (DBCC repaired the page)
-- 7 = Deallocated by DBCC
-- Ideally, this query returns no results. The table is limited to 1000 rows.
-- If you do get results here, you should do further investigation to determine the root cause
-- Manage the suspect_pages Table
-- https://bit.ly/2Fvr1c9
-- Get number of data files in tempdb database (Query 24) (Tempdb Data Files)
EXEC sys.xp_readerrorlog 0, 1, N'The tempdb database has';
------
-- Get the number of data files in the tempdb database
-- 4-8 data files that are all the same size is a good starting point
-- This query will return no results if your error log has been recycled since the instance was last started
-- This will be blank unless you have Service Pack 4 or later
-- File names and paths for all user and system databases on instance (Query 25) (Database Filenames and Paths)
SELECT DB_NAME([database_id]) AS [Database Name],
[file_id], [name], physical_name, [type_desc], state_desc,
is_percent_growth, growth,
CONVERT(bigint, growth/128.0) AS [Growth in MB],
CONVERT(bigint, size/128.0) AS [Total Size in MB], max_size
FROM sys.master_files WITH (NOLOCK)
ORDER BY DB_NAME([database_id]), [file_id] OPTION (RECOMPILE);
------
-- Things to look at:
-- Are data files and log files on different drives?
-- Is everything on the C: drive?
-- Is tempdb on dedicated drives?
-- Is there only one tempdb data file?
-- Are all of the tempdb data files the same size?
-- Are there multiple data files for user databases?
-- Is percent growth enabled for any files (which is bad)?
-- Volume info for all LUNS that have database files on the current instance (Query 26) (Volume Info)
SELECT DISTINCT vs.volume_mount_point, vs.file_system_type, vs.logical_volume_name,
CONVERT(DECIMAL(18,2), vs.total_bytes/1073741824.0) AS [Total Size (GB)],
CONVERT(DECIMAL(18,2), vs.available_bytes/1073741824.0) AS [Available Size (GB)],
CONVERT(DECIMAL(18,2), vs.available_bytes * 1. / vs.total_bytes * 100.) AS [Space Free %],
vs.supports_compression, vs.is_compressed,
vs.supports_sparse_files, vs.supports_alternate_streams
FROM sys.master_files AS f WITH (NOLOCK)
CROSS APPLY sys.dm_os_volume_stats(f.database_id, f.[file_id]) AS vs
ORDER BY vs.volume_mount_point OPTION (RECOMPILE);
------
-- Shows you the total and free space on the LUNs where you have database files
-- Being low on free space can negatively affect performance
-- sys.dm_os_volume_stats (Transact-SQL)
-- https://bit.ly/2oBPNNr
-- Drive level latency information (Query 27) (Drive Level Latency)
-- Based on code from Jimmy May
SELECT tab.[Drive], tab.volume_mount_point AS [Volume Mount Point],
CASE
WHEN num_of_reads = 0 THEN 0
ELSE (io_stall_read_ms/num_of_reads)
END AS [Read Latency],
CASE
WHEN num_of_writes = 0 THEN 0
ELSE (io_stall_write_ms/num_of_writes)
END AS [Write Latency],
CASE
WHEN (num_of_reads = 0 AND num_of_writes = 0) THEN 0
ELSE (io_stall/(num_of_reads + num_of_writes))
END AS [Overall Latency],
CASE
WHEN num_of_reads = 0 THEN 0
ELSE (num_of_bytes_read/num_of_reads)
END AS [Avg Bytes/Read],
CASE
WHEN num_of_writes = 0 THEN 0
ELSE (num_of_bytes_written/num_of_writes)
END AS [Avg Bytes/Write],
CASE
WHEN (num_of_reads = 0 AND num_of_writes = 0) THEN 0
ELSE ((num_of_bytes_read + num_of_bytes_written)/(num_of_reads + num_of_writes))
END AS [Avg Bytes/Transfer]
FROM (SELECT LEFT(UPPER(mf.physical_name), 2) AS Drive, SUM(num_of_reads) AS num_of_reads,
SUM(io_stall_read_ms) AS io_stall_read_ms, SUM(num_of_writes) AS num_of_writes,
SUM(io_stall_write_ms) AS io_stall_write_ms, SUM(num_of_bytes_read) AS num_of_bytes_read,
SUM(num_of_bytes_written) AS num_of_bytes_written, SUM(io_stall) AS io_stall, vs.volume_mount_point
FROM sys.dm_io_virtual_file_stats(NULL, NULL) AS vfs
INNER JOIN sys.master_files AS mf WITH (NOLOCK)
ON vfs.database_id = mf.database_id AND vfs.file_id = mf.file_id
CROSS APPLY sys.dm_os_volume_stats(mf.database_id, mf.[file_id]) AS vs
GROUP BY LEFT(UPPER(mf.physical_name), 2), vs.volume_mount_point) AS tab
ORDER BY [Overall Latency] OPTION (RECOMPILE);
------
-- Shows you the drive-level latency for reads and writes, in milliseconds
-- Latency above 30-40ms is usually a problem
-- These latency numbers include all file activity against all SQL Server
-- database files on each drive since SQL Server was last started
-- Calculates average stalls per read, per write, and per total input/output for each database file (Query 28) (IO Latency by File)
SELECT DB_NAME(fs.database_id) AS [Database Name], CAST(fs.io_stall_read_ms/(1.0 + fs.num_of_reads) AS NUMERIC(10,1)) AS [avg_read_latency_ms],
CAST(fs.io_stall_write_ms/(1.0 + fs.num_of_writes) AS NUMERIC(10,1)) AS [avg_write_latency_ms],
CAST((fs.io_stall_read_ms + fs.io_stall_write_ms)/(1.0 + fs.num_of_reads + fs.num_of_writes) AS NUMERIC(10,1)) AS [avg_io_latency_ms],
CONVERT(DECIMAL(18,2), mf.size/128.0) AS [File Size (MB)], mf.physical_name, mf.type_desc, fs.io_stall_read_ms, fs.num_of_reads,
fs.io_stall_write_ms, fs.num_of_writes, fs.io_stall_read_ms + fs.io_stall_write_ms AS [io_stalls], fs.num_of_reads + fs.num_of_writes AS [total_io]
FROM sys.dm_io_virtual_file_stats(null,null) AS fs
INNER JOIN sys.master_files AS mf WITH (NOLOCK)
ON fs.database_id = mf.database_id
AND fs.[file_id] = mf.[file_id]
ORDER BY avg_io_latency_ms DESC OPTION (RECOMPILE);
------
-- Helps determine which database files on the entire instance have the most I/O bottlenecks
-- This can help you decide whether certain LUNs are overloaded and whether you might
-- want to move some files to a different location or perhaps improve your I/O performance
-- These latency numbers include all file activity against each SQL Server
-- database file since SQL Server was last started
-- Look for I/O requests taking longer than 15 seconds in the six most recent SQL Server Error Logs (Query 29) (IO Warnings)
CREATE TABLE #IOWarningResults(LogDate datetime, ProcessInfo sysname, LogText nvarchar(1000));
INSERT INTO #IOWarningResults
EXEC xp_readerrorlog 0, 1, N'taking longer than 15 seconds';
INSERT INTO #IOWarningResults
EXEC xp_readerrorlog 1, 1, N'taking longer than 15 seconds';
INSERT INTO #IOWarningResults
EXEC xp_readerrorlog 2, 1, N'taking longer than 15 seconds';
INSERT INTO #IOWarningResults
EXEC xp_readerrorlog 3, 1, N'taking longer than 15 seconds';
INSERT INTO #IOWarningResults
EXEC xp_readerrorlog 4, 1, N'taking longer than 15 seconds';
INSERT INTO #IOWarningResults
EXEC xp_readerrorlog 5, 1, N'taking longer than 15 seconds';
SELECT LogDate, ProcessInfo, LogText
FROM #IOWarningResults
ORDER BY LogDate DESC;
DROP TABLE #IOWarningResults;
------
-- Finding 15 second I/O warnings in the SQL Server Error Log is useful evidence of
-- poor I/O performance (which might have many different causes)
-- Look to see if you see any patterns in the results (same files, same drives, same time of day, etc.)
-- Diagnostics in SQL Server help detect stalled and stuck I/O operations
-- https://bit.ly/2qtaw73
-- Resource Governor Resource Pool information (Query 30) (RG Resource Pools)
SELECT pool_id, [Name], statistics_start_time,
min_memory_percent, max_memory_percent,
max_memory_kb/1024 AS [max_memory_mb],
used_memory_kb/1024 AS [used_memory_mb],
target_memory_kb/1024 AS [target_memory_mb]
FROM sys.dm_resource_governor_resource_pools WITH (NOLOCK)
OPTION (RECOMPILE);
------
-- sys.dm_resource_governor_resource_pools (Transact-SQL)
-- https://bit.ly/2MVU0Vy
-- Recovery model, log reuse wait description, log file size, log usage size (Query 31) (Database Properties)
-- and compatibility level for all databases on instance
SELECT db.[name] AS [Database Name], SUSER_SNAME(db.owner_sid) AS [Database Owner], db.recovery_model_desc AS [Recovery Model],
db.state_desc, db.containment_desc, db.log_reuse_wait_desc AS [Log Reuse Wait Description],
CONVERT(DECIMAL(18,2), ls.cntr_value/1024.0) AS [Log Size (MB)], CONVERT(DECIMAL(18,2), lu.cntr_value/1024.0) AS [Log Used (MB)],
CAST(CAST(lu.cntr_value AS FLOAT) / CAST(ls.cntr_value AS FLOAT)AS DECIMAL(18,2)) * 100 AS [Log Used %],
db.[compatibility_level] AS [DB Compatibility Level], db.page_verify_option_desc AS [Page Verify Option],
db.is_auto_create_stats_on, db.is_auto_update_stats_on, db.is_auto_update_stats_async_on, db.is_parameterization_forced,
db.snapshot_isolation_state_desc, db.is_read_committed_snapshot_on, db.is_auto_close_on, db.is_auto_shrink_on,
db.target_recovery_time_in_seconds, db.is_cdc_enabled, db.is_published, db.group_database_id, db.replica_id,
db.is_encrypted, de.encryption_state, de.percent_complete, de.key_algorithm, de.key_length
FROM sys.databases AS db WITH (NOLOCK)
INNER JOIN sys.dm_os_performance_counters AS lu WITH (NOLOCK)
ON db.name = lu.instance_name
INNER JOIN sys.dm_os_performance_counters AS ls WITH (NOLOCK)
ON db.name = ls.instance_name
LEFT OUTER JOIN sys.dm_database_encryption_keys AS de WITH (NOLOCK)
ON db.database_id = de.database_id
WHERE lu.counter_name LIKE N'Log File(s) Used Size (KB)%'
AND ls.counter_name LIKE N'Log File(s) Size (KB)%'
AND ls.cntr_value > 0
ORDER BY db.[name] OPTION (RECOMPILE);
------
-- Things to look at:
-- How many databases are on the instance?
-- What recovery models are they using?
-- What is the log reuse wait description?
-- How full are the transaction logs?
-- What compatibility level are the databases on?
-- What is the Page Verify Option? (should be CHECKSUM)
-- Is Auto Update Statistics Asynchronously enabled?
-- Make sure auto_shrink and auto_close are not enabled!
-- Missing Indexes for all databases by Index Advantage (Query 32) (Missing Indexes All Databases)
SELECT CONVERT(decimal(18,2), migs.user_seeks * migs.avg_total_user_cost * (migs.avg_user_impact * 0.01)) AS [index_advantage],
FORMAT(migs.last_user_seek, 'yyyy-MM-dd HH:mm:ss') AS [last_user_seek],
mid.[statement] AS [Database.Schema.Table],
COUNT(1) OVER(PARTITION BY mid.[statement]) AS [missing_indexes_for_table],
COUNT(1) OVER(PARTITION BY mid.[statement], equality_columns) AS [similar_missing_indexes_for_table],
mid.equality_columns, mid.inequality_columns, mid.included_columns, migs.user_seeks,
CONVERT(decimal(18,2), migs.avg_total_user_cost) AS [avg_total_user_cost], migs.avg_user_impact
FROM sys.dm_db_missing_index_group_stats AS migs WITH (NOLOCK)
INNER JOIN sys.dm_db_missing_index_groups AS mig WITH (NOLOCK)
ON migs.group_handle = mig.index_group_handle
INNER JOIN sys.dm_db_missing_index_details AS mid WITH (NOLOCK)
ON mig.index_handle = mid.index_handle
ORDER BY index_advantage DESC OPTION (RECOMPILE);
------
-- Getting missing index information for all of the databases on the instance is very useful
-- Look at last user seek time, number of user seeks to help determine source and importance
-- Also look at avg_user_impact and avg_total_user_cost to help determine importance
-- SQL Server is overly eager to add included columns, so beware
-- Do not just blindly add indexes that show up from this query!!!
-- Håkan Winther has given me some great suggestions for this query
-- SQL Server Index Design Guide
-- https://bit.ly/2qtZr4N
-- Get VLF Counts for all databases on the instance (Query 33) (VLF Counts)
-- (adapted from Michelle Ufford)
CREATE TABLE #VLFInfo (RecoveryUnitID int, FileID int,
FileSize bigint, StartOffset bigint,
FSeqNo bigint, [Status] bigint,
Parity bigint, CreateLSN numeric(38));
CREATE TABLE #VLFCountResults(DatabaseName sysname, VLFCount int);
EXEC sp_MSforeachdb N'Use [?];
INSERT INTO #VLFInfo
EXEC sp_executesql N''DBCC LOGINFO([?])'';
INSERT INTO #VLFCountResults
SELECT DB_NAME(), COUNT(*)
FROM #VLFInfo;
TRUNCATE TABLE #VLFInfo;'
SELECT DatabaseName, VLFCount
FROM #VLFCountResults
ORDER BY VLFCount DESC;
DROP TABLE #VLFInfo;
DROP TABLE #VLFCountResults;
------
-- High VLF counts can affect write performance to the log file
-- and they can make full database restores and crash recovery take much longer
-- Try to keep your VLF counts under 200 in most cases (depending on log file size)
-- Get CPU utilization by database (Query 34) (CPU Usage by Database)
WITH DB_CPU_Stats
AS
(SELECT pa.DatabaseID, DB_Name(pa.DatabaseID) AS [Database Name], SUM(qs.total_worker_time/1000) AS [CPU_Time_Ms]
FROM sys.dm_exec_query_stats AS qs WITH (NOLOCK)
CROSS APPLY (SELECT CONVERT(int, value) AS [DatabaseID]
FROM sys.dm_exec_plan_attributes(qs.plan_handle)
WHERE attribute = N'dbid') AS pa
GROUP BY DatabaseID)
SELECT ROW_NUMBER() OVER(ORDER BY [CPU_Time_Ms] DESC) AS [CPU Rank],
[Database Name], [CPU_Time_Ms] AS [CPU Time (ms)],
CAST([CPU_Time_Ms] * 1.0 / SUM([CPU_Time_Ms]) OVER() * 100.0 AS DECIMAL(5, 2)) AS [CPU Percent]
FROM DB_CPU_Stats
WHERE DatabaseID <> 32767 -- ResourceDB
ORDER BY [CPU Rank] OPTION (RECOMPILE);
------
-- Helps determine which database is using the most CPU resources on the instance
-- Note: This only reflects CPU usage from the currently cached query plans
-- Get I/O utilization by database (Query 35) (IO Usage By Database)
WITH Aggregate_IO_Statistics
AS (SELECT DB_NAME(database_id) AS [Database Name],
CAST(SUM(num_of_bytes_read + num_of_bytes_written) / 1048576 AS DECIMAL(12, 2)) AS [ioTotalMB],
CAST(SUM(num_of_bytes_read ) / 1048576 AS DECIMAL(12, 2)) AS [ioReadMB],
CAST(SUM(num_of_bytes_written) / 1048576 AS DECIMAL(12, 2)) AS [ioWriteMB]
FROM sys.dm_io_virtual_file_stats(NULL, NULL) AS [DM_IO_STATS]
GROUP BY database_id)
SELECT ROW_NUMBER() OVER (ORDER BY ioTotalMB DESC) AS [I/O Rank],
[Database Name], ioTotalMB AS [Total I/O (MB)],
CAST(ioTotalMB / SUM(ioTotalMB) OVER () * 100.0 AS DECIMAL(5, 2)) AS [Total I/O %],
ioReadMB AS [Read I/O (MB)],
CAST(ioReadMB / SUM(ioReadMB) OVER () * 100.0 AS DECIMAL(5, 2)) AS [Read I/O %],
ioWriteMB AS [Write I/O (MB)],
CAST(ioWriteMB / SUM(ioWriteMB) OVER () * 100.0 AS DECIMAL(5, 2)) AS [Write I/O %]
FROM Aggregate_IO_Statistics
ORDER BY [I/O Rank] OPTION (RECOMPILE);
------
-- Helps determine which database is using the most I/O resources on the instance
-- These numbers are cumulative since the last service restart
-- They include all I/O activity, not just the nominal I/O workload
-- Get total buffer usage by database for current instance (Query 36) (Total Buffer Usage by Database)
-- This make take some time to run on a busy instance
WITH AggregateBufferPoolUsage
AS
(SELECT DB_NAME(database_id) AS [Database Name],
CAST(COUNT(*) * 8/1024.0 AS DECIMAL (10,2)) AS [CachedSize]
FROM sys.dm_os_buffer_descriptors WITH (NOLOCK)
WHERE database_id <> 32767 -- ResourceDB
GROUP BY DB_NAME(database_id))
SELECT ROW_NUMBER() OVER(ORDER BY CachedSize DESC) AS [Buffer Pool Rank], [Database Name], CachedSize AS [Cached Size (MB)],
CAST(CachedSize / SUM(CachedSize) OVER() * 100.0 AS DECIMAL(5,2)) AS [Buffer Pool Percent]
FROM AggregateBufferPoolUsage
ORDER BY [Buffer Pool Rank] OPTION (RECOMPILE);
------
-- Tells you how much memory (in the buffer pool)
-- is being used by each database on the instance
-- Clear Wait Stats with this command
-- DBCC SQLPERF('sys.dm_os_wait_stats', CLEAR);
-- Isolate top waits for server instance since last restart or wait statistics clear (Query 37) (Top Waits)
WITH [Waits]
AS (SELECT wait_type, wait_time_ms/ 1000.0 AS [WaitS],
(wait_time_ms - signal_wait_time_ms) / 1000.0 AS [ResourceS],
signal_wait_time_ms / 1000.0 AS [SignalS],
waiting_tasks_count AS [WaitCount],
100.0 * wait_time_ms / SUM (wait_time_ms) OVER() AS [Percentage],
ROW_NUMBER() OVER(ORDER BY wait_time_ms DESC) AS [RowNum]
FROM sys.dm_os_wait_stats WITH (NOLOCK)
WHERE [wait_type] NOT IN (
N'BROKER_EVENTHANDLER', N'BROKER_RECEIVE_WAITFOR', N'BROKER_TASK_STOP',
N'BROKER_TO_FLUSH', N'BROKER_TRANSMITTER', N'CHECKPOINT_QUEUE',
N'CHKPT', N'CLR_AUTO_EVENT', N'CLR_MANUAL_EVENT', N'CLR_SEMAPHORE',
N'DBMIRROR_DBM_EVENT', N'DBMIRROR_EVENTS_QUEUE', N'DBMIRROR_WORKER_QUEUE',
N'DBMIRRORING_CMD', N'DIRTY_PAGE_POLL', N'DISPATCHER_QUEUE_SEMAPHORE',
N'EXECSYNC', N'FSAGENT', N'FT_IFTS_SCHEDULER_IDLE_WAIT', N'FT_IFTSHC_MUTEX',
N'HADR_CLUSAPI_CALL', N'HADR_FILESTREAM_IOMGR_IOCOMPLETION', N'HADR_LOGCAPTURE_WAIT',
N'HADR_NOTIFICATION_DEQUEUE', N'HADR_TIMER_TASK', N'HADR_WORK_QUEUE',
N'KSOURCE_WAKEUP', N'LAZYWRITER_SLEEP', N'LOGMGR_QUEUE', N'ONDEMAND_TASK_QUEUE',
N'PREEMPTIVE_OS_QUERYREGISTRY',
N'PREEMPTIVE_HADR_LEASE_MECHANISM', N'PREEMPTIVE_SP_SERVER_DIAGNOSTICS',
N'PWAIT_ALL_COMPONENTS_INITIALIZED',
N'QDS_PERSIST_TASK_MAIN_LOOP_SLEEP',
N'QDS_CLEANUP_STALE_QUERIES_TASK_MAIN_LOOP_SLEEP', N'REQUEST_FOR_DEADLOCK_SEARCH',
N'RESOURCE_QUEUE', N'SERVER_IDLE_CHECK', N'SLEEP_BPOOL_FLUSH', N'SLEEP_DBSTARTUP',
N'SLEEP_DCOMSTARTUP', N'SLEEP_MASTERDBREADY', N'SLEEP_MASTERMDREADY',
N'SLEEP_MASTERUPGRADED', N'SLEEP_MSDBSTARTUP', N'SLEEP_SYSTEMTASK', N'SLEEP_TASK',
N'SLEEP_TEMPDBSTARTUP', N'SNI_HTTP_ACCEPT', N'SP_SERVER_DIAGNOSTICS_SLEEP',
N'SQLTRACE_BUFFER_FLUSH', N'SQLTRACE_INCREMENTAL_FLUSH_SLEEP', N'SQLTRACE_WAIT_ENTRIES',
N'WAIT_FOR_RESULTS', N'WAITFOR', N'WAITFOR_TASKSHUTDOWN', N'WAIT_XTP_HOST_WAIT',
N'WAIT_XTP_OFFLINE_CKPT_NEW_LOG', N'WAIT_XTP_CKPT_CLOSE', N'XE_DISPATCHER_JOIN',
N'XE_DISPATCHER_WAIT', N'XE_TIMER_EVENT')
AND waiting_tasks_count > 0)
SELECT
MAX (W1.wait_type) AS [WaitType],
CAST (MAX (W1.Percentage) AS DECIMAL (5,2)) AS [Wait Percentage],
CAST ((MAX (W1.WaitS) / MAX (W1.WaitCount)) AS DECIMAL (16,4)) AS [AvgWait_Sec],
CAST ((MAX (W1.ResourceS) / MAX (W1.WaitCount)) AS DECIMAL (16,4)) AS [AvgRes_Sec],
CAST ((MAX (W1.SignalS) / MAX (W1.WaitCount)) AS DECIMAL (16,4)) AS [AvgSig_Sec],
CAST (MAX (W1.WaitS) AS DECIMAL (16,2)) AS [Wait_Sec],
CAST (MAX (W1.ResourceS) AS DECIMAL (16,2)) AS [Resource_Sec],
CAST (MAX (W1.SignalS) AS DECIMAL (16,2)) AS [Signal_Sec],
MAX (W1.WaitCount) AS [Wait Count],
CAST (N'https://www.sqlskills.com/help/waits/' + W1.wait_type AS XML) AS [Help/Info URL]
FROM Waits AS W1
INNER JOIN Waits AS W2
ON W2.RowNum <= W1.RowNum
GROUP BY W1.RowNum, W1.wait_type
HAVING SUM (W2.Percentage) - MAX (W1.Percentage) < 99 -- percentage threshold
OPTION (RECOMPILE);
------
-- Cumulative wait stats are not as useful on an idle instance that is not under load or performance pressure
-- SQL Server Wait Types Library (Paul Randal)
-- https://www.sqlskills.com/help/waits/
-- The SQL Server Wait Type Repository
-- http://blogs.msdn.com/b/psssql/archive/2009/11/03/the-sql-server-wait-type-repository.aspx
-- Wait statistics, or please tell me where it hurts
-- http://www.sqlskills.com/blogs/paul/wait-statistics-or-please-tell-me-where-it-hurts/
-- SQL Server 2005 Performance Tuning using the Waits and Queues
-- http://technet.microsoft.com/en-us/library/cc966413.aspx
-- sys.dm_os_wait_stats (Transact-SQL)
-- http://msdn.microsoft.com/en-us/library/ms179984(v=sql.120).aspx
-- Get a count of SQL connections by IP address (Query 38) (Connection Counts by IP Address)
SELECT ec.client_net_address, es.[program_name], es.[host_name], es.login_name,
COUNT(ec.session_id) AS [connection count]
FROM sys.dm_exec_sessions AS es WITH (NOLOCK)
INNER JOIN sys.dm_exec_connections AS ec WITH (NOLOCK)
ON es.session_id = ec.session_id
GROUP BY ec.client_net_address, es.[program_name], es.[host_name], es.login_name
ORDER BY ec.client_net_address, es.[program_name] OPTION (RECOMPILE);
------
-- This helps you figure where your database load is coming from
-- and verifies connectivity from other machines
-- Solving Connectivity errors to SQL Server
-- https://bit.ly/2EgzoD0
-- Get Average Task Counts (run multiple times) (Query 39) (Avg Task Counts)
SELECT AVG(current_tasks_count) AS [Avg Task Count],
AVG(work_queue_count) AS [Avg Work Queue Count],
AVG(runnable_tasks_count) AS [Avg Runnable Task Count],
AVG(pending_disk_io_count) AS [Avg Pending DiskIO Count]