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Showing posts with label Diagnostic Information Queries. Show all posts
Showing posts with label Diagnostic Information Queries. Show all posts

SQL Server 2008 R2 Diagnostic Information Queries 


 -- SQL Server 2008 R2 Diagnostic Information Queries
-- Many of these queries will not work if you have databases in 80 compatibility mode

 --******************************************************************************
--*   Copyright (C) 2014 Glenn Berry, SQLskills.com
--*   All rights reserved. 
--*
--*   For more scripts and sample code, check out 
--*      http://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. 
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 -- Note: A number of these queries will only work on SQL Server 2008 R2 SP1 or later
-- They are all noted in the instructions

 -- Check the major product version to see if it is SQL Server 2008 R2
IF NOT EXISTS (SELECT * WHERE CONVERT(varchar(128), SERVERPROPERTY('ProductVersion')) LIKE '10.5%')
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
-- 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];

 -- Any build older than 10.50.4000 is on an "unsupported service pack"

 -- SQL Server 2008 R2 Builds SQL Server 2008 R2 SP1 Builds SQL Server 2008 R2 SP2 Builds
-- Build Description Build Description Build Description
-- 10.50.1092 August 2009 CTP2
-- 10.50.1352 November 2009 CTP3
-- 10.50.1450 Release Candidate
-- 10.50.1600 RTM
-- 10.50.1702 RTM CU1
-- 10.50.1720 RTM CU2
-- 10.50.1734 RTM CU3
-- 10.50.1746 RTM CU4
-- 10.50.1753 RTM CU5
-- 10.50.1765 RTM CU6  ---> 10.50.2500 SP1 RTM
-- 10.50.1777 RTM CU7
-- 10.50.1797 RTM CU8  ---> 10.50.2769  SP1 CU1
-- 10.50.1804       RTM CU9  ---> 10.50.2772  SP1 CU2
-- 10.50.1807 RTM CU10 --->           10.50.2789  SP1 CU3
-- 10.50.1809       RTM CU11 ---> 10.50.2796  SP1 CU4 
-- 10.50.1810 RTM CU12 ---> 10.50.2806 SP1 CU5 ---> 10.50.4000 SP2 RTM
-- 10.50.1815 RTM CU13 --->           10.50.2811  SP1 CU6
-- 10.50.1817 RTM CU14 ---> 10.50.2817  SP1 CU7 ---> 10.50.4260 SP2 CU1          7/24/2012
-- RTM Branch Retired        ---> 10.50.2822  SP1 CU8     ---> 10.50.4263  SP2 CU2                  8/31/2012   
-- 10.50.2866  SP1 CU9     ---> 10.50.4266  SP2 CU3 10/15/2012
--                                          10.50.2868  SP1 CU10    ---> 10.50.4270  SP2 CU4 12/17/2012
--                                          10.50.2869  SP1 CU11    --->            10.50.4276  SP2 CU5      2/18/2013
--                                          10.50.2874  SP1 CU12    --->            10.50.4279  SP2 CU6                  4/15/2013
--                                          10.50.2876  SP1 CU13    --->            10.50.4286  SP2 CU7  6/17/2013
--                                          10.50.2881  SP1 CU14    --->            10.50.4290  SP2 CU8                  8/22/2013
--                                                                                  10.50.4295  SP2 CU9                 10/28/2013  
--                                                                                  10.50.4297  SP2 CU10                12/16/2013               

-- SQL Server 2008 R2 RTM was considered an "unsupported service pack" as of July 12, 2012
-- SQL Server 2008 R2 SP1 was considered an "unsupported service pack" as of August 8, 2013

-- The SQL Server 2008 R2 builds that were released after SQL Server 2008 R2 was released
-- http://support.microsoft.com/kb/981356

 -- The SQL Server 2008 R2 builds that were released after SQL Server 2008 R2 Service Pack 1 was released 
-- http://support.microsoft.com/kb/2567616

 -- Microsoft released SQL Server 2008 R2 SP1 CU14 on 8/8/2013, then pulled it the next day, "since SP1 is ending mainstream support"

 -- The SQL Server 2008 R2 builds that were released after SQL Server 2008 R2 Service Pack 2 was released
-- http://support.microsoft.com/kb/2730301 
-- When was SQL Server installed  (Query 2) (SQL Server Install Date) 
SELECT @@SERVERNAME AS [Server Name], createdate AS [SQL Server Install Date], loginname, [sid] 
FROM sys.syslogins WITH (NOLOCK)
WHERE loginname = N'NT AUTHORITY\SYSTEM'
OR loginname = N'NT AUTHORITY\NETWORK SERVICE';

 -- Tells you the date and time that SQL Server was installed
-- It is a good idea to know how old your instance is
-- Get selected server properties (SQL Server 2008 R2)  (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], 
SERVERPROPERTY('ProductVersion') AS [ProductVersion], SERVERPROPERTY('ProcessID') AS [ProcessID],
SERVERPROPERTY('Collation') AS [Collation], SERVERPROPERTY('IsFullTextInstalled') AS [IsFullTextInstalled], 
SERVERPROPERTY('IsIntegratedSecurityOnly') AS [IsIntegratedSecurityOnly];

 -- This gives you a lot of useful information about your instance of SQL Server,
-- such as the ProcessID for SQL Server and your collation
-- Get SQL Server Agent jobs and Category information (Query 4) (SQL Server Agent Jobs)
SELECT sj.name AS [JobName], sj.[description] AS [JobDescription], SUSER_SNAME(sj.owner_sid) AS [JobOwner],
sj.date_created, sj.[enabled], sj.notify_email_operator_id, sc.name AS [CategoryName]
FROM msdb.dbo.sysjobs AS sj WITH (NOLOCK)
INNER JOIN msdb.dbo.syscategories AS sc WITH (NOLOCK)
ON sj.category_id = sc.category_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
-- Get SQL Server Agent Alert Information (Query 5) (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: http://www.sqlskills.com/blogs/glenn/creating-sql-server-agent-alerts-for-critical-errors/

-- Returns a list of all global trace flags that are enabled (Query 6) (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 3226 - Supresses logging of successful database backup messages to the SQL Server Error Log
-- TF 1118 - Helps alleviate allocation contention in tempdb (more important with older versions of SQL Server)
-- Windows information (SQL Server 2008 R2 SP1 or greater)  (Query 7) (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 
-- 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
-- 5.2 is either Windows XP or Windows Server 2003

 -- Hardware and Software Requirements for Installing SQL Server 2008 R2
-- http://msdn.microsoft.com/en-us/library/ms143506(v=sql.105).aspx

 -- Using SQL Server in Windows 8, Windows 8.1, Windows Server 2012 and Windows Server 2012 R2 environments
-- http://support.microsoft.com/kb/2681562
-- SQL Server Services information (SQL Server 2008 R2 SP1 or greater)  (Query 8) (SQL Server Services Info)
SELECT servicename, startup_type_desc, status_desc, 
last_startup_time, service_account, is_clustered, cluster_nodename
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 when they were last started, and their current status
-- Shows whether you are running on a failover cluster

-- SQL Server NUMA Node information  (Query 9) (SQL Server NUMA Info)
SELECT node_id, node_state_desc, memory_node_id, online_scheduler_count, 
       active_worker_count, avg_load_balance 
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


-- Hardware information from SQL Server 2008 R2  (Query 10) (Hardware Info)
-- (Cannot distinguish between HT and multi-core)
SELECT cpu_count AS [Logical CPU Count], hyperthread_ratio AS [Hyperthread Ratio],
cpu_count/hyperthread_ratio AS [Physical CPU Count], 
physical_memory_in_bytes/1048576 AS [Physical Memory (MB)], 
sqlserver_start_time, affinity_type_desc 
FROM sys.dm_os_sys_info WITH (NOLOCK) OPTION (RECOMPILE);

 -- Gives you some good basic hardware information about your database server
-- Get System Manufacturer and model number from  (Query 11) (System Manufacturer)
-- SQL Server Error log. This query might take a few seconds 
-- if you have not recycled your error log recently
EXEC xp_readerrorlog 0,1,"Manufacturer"; 

 -- This can help you determine the capabilities
-- and capacities of your database server
-- Get processor description from Windows Registry  (Query 12) (Processor Description)
EXEC xp_instance_regread N'HKEY_LOCAL_MACHINE', N'HARDWARE\DESCRIPTION\System\CentralProcessor\0', 'ProcessorNameString';

 -- Gives you the model number and rated clock speed of your processor(s)
-- Your processors may be running at less that the rated clock speed due
-- to the Windows Power Plan or hardware power management
-- Get the current node name from your cluster nodes  (Query 13) (Current Cluster Node)
-- (if your database server is in a cluster)
SELECT NodeName
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
-- Get configuration values for instance  (Query 14) (Configuration Values)
SELECT name, value, value_in_use, [description] 
FROM sys.configurations WITH (NOLOCK)
ORDER BY name OPTION (RECOMPILE);

 -- Focus on
-- backup compression default
-- cost threshold for parallelism
-- clr enabled (only enable if it is needed)
-- lightweight pooling (should be zero)
-- max degree of parallelism (depends on your workload)
-- max server memory (MB) (set to an appropriate value)
-- optimize for ad hoc workloads (should be 1)
-- priority boost (should be zero)

-- Get information on location, time and size of any memory dumps from SQL Server (SQL Server 2008 R2 SP1 or greater)  (Query 15) (Memory Dump Info)
SELECT [filename], creation_time, size_in_bytes
FROM sys.dm_server_memory_dumps WITH (NOLOCK) OPTION (RECOMPILE);

 -- This will not return any rows if you have 
-- not had any memory dumps (which is a good thing)
-- File Names and Paths for TempDB and all user databases in instance  (Query 16) (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, size/128.0) AS [Total Size in MB]
FROM sys.master_files WITH (NOLOCK)
WHERE [database_id] > 4 
AND [database_id] <> 32767
OR [database_id] = 2
ORDER BY DB_NAME([database_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 databases on the current instance (SQL Server 2008 R2 SP1 or greater)  (Query 17) (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)],  
CAST(CAST(vs.available_bytes AS FLOAT)/ CAST(vs.total_bytes AS FLOAT) AS DECIMAL(18,2)) * 100 AS [Space Free %] 
FROM sys.master_files AS f WITH (NOLOCK)
CROSS APPLY sys.dm_os_volume_stats(f.database_id, f.[file_id]) AS vs OPTION (RECOMPILE);

 --Shows you the total and free space on the LUNs where you have database files

-- Drive level latency information (Query 18) (Drive Level Latency)
-- Based on code from Jimmy May
SELECT [Drive],
CASE 
WHEN num_of_reads = 0 THEN 0 
ELSE (io_stall_read_ms/num_of_reads) 
END AS [Read Latency],
CASE 
WHEN io_stall_write_ms = 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 io_stall_write_ms = 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(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
      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
      GROUP BY LEFT(mf.physical_name, 2)) AS tab
ORDER BY [Overall Latency] OPTION (RECOMPILE);

 -- Shows you the drive-level latency for reads and writes, in milliseconds
-- Latency above 20-25ms is usually a problem

-- Recovery model, log reuse wait description, log file size, log usage size  (Query 19) (Database Properties)
-- and compatibility level for all databases on instance
SELECT db.[name] AS [Database Name], db.recovery_model_desc AS [Recovery Model], 
db.log_reuse_wait_desc AS [Log Reuse Wait Description], 
ls.cntr_value AS [Log Size (KB)], lu.cntr_value AS [Log Used (KB)],
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.is_cdc_enabled
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
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 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 they on?
-- What is the Page Verify Option?
-- Make sure auto_shrink and auto_close are not enabled!

-- Missing Indexes for all databases by Index Advantage  (Query 20) (Missing Indexes All Databases)
SELECT CONVERT(decimal(18,2), user_seeks * avg_total_user_cost * (avg_user_impact * 0.01)) AS [index_advantage],  
migs.last_user_seek, mid.[statement] AS [Database.Schema.Table],
mid.equality_columns, mid.inequality_columns, mid.included_columns,
migs.unique_compiles, migs.user_seeks, migs.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!!!

-- Get VLF Counts for all databases on the instance (Query 21) (VLF Counts)
-- (adapted from Michelle Ufford) 
CREATE TABLE #VLFInfo (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 
-- and they can make database restores and recovery take much longer
-- Try to keep your VLF counts under 200 in most cases

-- Calculates average stalls per read, per write, and per total input/output for each database file  (Query 22) (IO Stalls by File)
SELECT DB_NAME(fs.database_id) AS [Database Name], CONVERT(DECIMAL(18,2), mf.size/128.0) AS [File Size (MB)], 
mf.physical_name, io_stall_read_ms, num_of_reads, CAST(io_stall_read_ms/(1.0 + num_of_reads) AS NUMERIC(10,1)) AS [avg_read_stall_ms],
io_stall_write_ms, num_of_writes,CAST(io_stall_write_ms/(1.0+num_of_writes) AS NUMERIC(10,1)) AS [avg_write_stall_ms],
io_stall_read_ms + io_stall_write_ms AS [io_stalls], num_of_reads + num_of_writes AS [total_io],
CAST((io_stall_read_ms + io_stall_write_ms)/(1.0 + num_of_reads + num_of_writes) AS NUMERIC(10,1)) 
AS [avg_io_stall_ms]
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_stall_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
-- Get CPU utilization by database (Query 23) (CPU Usage by Database)
WITH DB_CPU_Stats
AS
(SELECT DatabaseID, DB_Name(DatabaseID) AS [Database Name], SUM(total_worker_time) AS [CPU_Time_Ms]
 FROM sys.dm_exec_query_stats AS qs
 CROSS APPLY (SELECT CONVERT(int, value) AS [DatabaseID] 
              FROM sys.dm_exec_plan_attributes(qs.plan_handle)
              WHERE attribute = N'dbid') AS F_DB
 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
-- Get I/O utilization by database (Query 24) (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 io_in_mb
FROM sys.dm_io_virtual_file_stats(NULL, NULL) AS [DM_IO_STATS]
GROUP BY database_id)
SELECT ROW_NUMBER() OVER(ORDER BY io_in_mb DESC) AS [I/O Rank], [Database Name], io_in_mb AS [Total I/O (MB)],
       CAST(io_in_mb/ SUM(io_in_mb) OVER() * 100.0 AS DECIMAL(5,2)) AS [I/O Percent]
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
-- Get total buffer usage by database for current instance  (Query 25) (Total Buffer Usage by Database)
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 > 4 -- system databases
AND 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 
-- DBCC SQLPERF('sys.dm_os_wait_stats', CLEAR);

 -- Isolate top waits for server instance since last restart or statistics clear  (Query 26) (Top Waits)
WITH Waits AS
(SELECT wait_type, wait_time_ms / 1000. AS wait_time_s,
100. * wait_time_ms / SUM(wait_time_ms) OVER() AS pct,
ROW_NUMBER() OVER(ORDER BY wait_time_ms DESC) AS rn
FROM sys.dm_os_wait_stats WITH (NOLOCK)
WHERE wait_type NOT IN (N'CLR_SEMAPHORE',N'LAZYWRITER_SLEEP',N'RESOURCE_QUEUE',N'SLEEP_TASK',
N'SLEEP_SYSTEMTASK',N'SQLTRACE_BUFFER_FLUSH',N'WAITFOR', N'LOGMGR_QUEUE',N'CHECKPOINT_QUEUE',
N'REQUEST_FOR_DEADLOCK_SEARCH',N'XE_TIMER_EVENT',N'BROKER_TO_FLUSH',N'BROKER_TASK_STOP',N'CLR_MANUAL_EVENT',
N'CLR_AUTO_EVENT',N'DISPATCHER_QUEUE_SEMAPHORE', N'FT_IFTS_SCHEDULER_IDLE_WAIT',
N'XE_DISPATCHER_WAIT', N'XE_DISPATCHER_JOIN', N'SQLTRACE_INCREMENTAL_FLUSH_SLEEP',
N'ONDEMAND_TASK_QUEUE', N'BROKER_EVENTHANDLER', N'SLEEP_BPOOL_FLUSH'))
SELECT W1.wait_type, 
CAST(W1.wait_time_s AS DECIMAL(12, 2)) AS wait_time_s,
CAST(W1.pct AS DECIMAL(12, 2)) AS pct,
CAST(SUM(W2.pct) AS DECIMAL(12, 2)) AS running_pct
FROM Waits AS W1
INNER JOIN Waits AS W2
ON W2.rn <= W1.rn
GROUP BY W1.rn, W1.wait_type, W1.wait_time_s, W1.pct
HAVING SUM(W2.pct) - W1.pct < 99 OPTION (RECOMPILE); -- percentage threshold

 -- 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.105).aspx


-- Signal Waits for instance  (Query 27) (Signal Waits)
SELECT CAST(100.0 * SUM(signal_wait_time_ms) / SUM (wait_time_ms) AS NUMERIC(20,2)) 
AS [% Signal (CPU) Waits],
CAST(100.0 * SUM(wait_time_ms - signal_wait_time_ms) / SUM (wait_time_ms) AS NUMERIC(20,2)) 
AS [% Resource Waits]
FROM sys.dm_os_wait_stats WITH (NOLOCK) OPTION (RECOMPILE);

 -- Signal Waits above 10-15% is usually a sign of CPU pressure
-- Resource waits are non-CPU related waits
--  Get logins that are connected and how many sessions they have  (Query 28) (Connection Counts)
SELECT login_name, [program_name], COUNT(session_id) AS [session_count] 
FROM sys.dm_exec_sessions WITH (NOLOCK)
GROUP BY login_name, [program_name]
ORDER BY COUNT(session_id) DESC OPTION (RECOMPILE);

 -- This can help characterize your workload and
-- determine whether you are seeing a normal level of activity
-- Get Average Task Counts (run multiple times)  (Query 29) (Avg Task Counts)
SELECT AVG(current_tasks_count) AS [Avg Task Count], 
AVG(runnable_tasks_count) AS [Avg Runnable Task Count],
AVG(pending_disk_io_count) AS [Avg Pending DiskIO Count]
FROM sys.dm_os_schedulers WITH (NOLOCK)
WHERE scheduler_id < 255 OPTION (RECOMPILE);

 -- Sustained values above 10 suggest further investigation in that area
-- High Avg Task Counts are often caused by blocking or other resource contention
-- High Avg Runnable Task Counts are a good sign of CPU pressure
-- High Avg Pending DiskIO Counts are a sign of disk pressure
-- Get CPU Utilization History for last 256 minutes (in one minute intervals)  (Query 30) (CPU Utilization History)
-- This version works with SQL Server 2008 R2
DECLARE @ts_now bigint = (SELECT cpu_ticks/(cpu_ticks/ms_ticks) FROM sys.dm_os_sys_info WITH (NOLOCK)); 

 SELECT TOP(256) SQLProcessUtilization AS [SQL Server Process CPU Utilization], 
               SystemIdle AS [System Idle Process], 
               100 - SystemIdle - SQLProcessUtilization AS [Other Process CPU Utilization], 
               DATEADD(ms, -1 * (@ts_now - [timestamp]), GETDATE()) AS [Event Time] 
FROM ( 
  SELECT record.value('(./Record/@id)[1]', 'int') AS record_id, 
record.value('(./Record/SchedulerMonitorEvent/SystemHealth/SystemIdle)[1]', 'int') 
AS [SystemIdle], 
record.value('(./Record/SchedulerMonitorEvent/SystemHealth/ProcessUtilization)[1]', 
'int') 
AS [SQLProcessUtilization], [timestamp] 
  FROM ( 
SELECT [timestamp], CONVERT(xml, record) AS [record] 
FROM sys.dm_os_ring_buffers WITH (NOLOCK)
WHERE ring_buffer_type = N'RING_BUFFER_SCHEDULER_MONITOR' 
AND record LIKE N'%<SystemHealth>%') AS x 
  ) AS y 
ORDER BY record_id DESC OPTION (RECOMPILE);

 -- Look at the trend over the entire period. 
-- Also look at high sustained Other Process CPU Utilization values
-- Good basic information about OS memory amounts and state  (Query 31) (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"
-- This indicates that you are not under external memory pressure
-- SQL Server Process Address space info  (Query 32) (Process Memory) 
-- (shows whether locked pages is enabled, among other things)
SELECT physical_memory_in_use_kb/1024 AS [SQL Server Memory Usage (MB)],
       large_page_allocations_kb, locked_page_allocations_kb, 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
-- Page Life Expectancy (PLE) value for each NUMA node in current instance  (Query 33) (PLE by NUMA Node)
SELECT @@SERVERNAME AS [Server Name], [object_name], instance_name, cntr_value AS [Page Life Expectancy]
FROM sys.dm_os_performance_counters WITH (NOLOCK)
WHERE [object_name] LIKE N'%Buffer Node%' -- Handles named instances
AND counter_name = N'Page life expectancy' OPTION (RECOMPILE);

 -- PLE is a good measurement of memory pressure.
-- Higher PLE is better. Watch the trend, not the absolute value.
-- This will only return one row for non-NUMA systems.
-- Memory Grants Pending value for current instance  (Query 34) (Memory Grants Pending)
SELECT @@SERVERNAME AS [Server Name], [object_name], cntr_value AS [Memory Grants Pending]                                                                                                       
FROM sys.dm_os_performance_counters WITH (NOLOCK)
WHERE [object_name] LIKE N'%Memory Manager%' -- Handles named instances
AND counter_name = N'Memory Grants Pending' OPTION (RECOMPILE);

 -- Memory Grants Pending above zero for a sustained period is a very strong indicator of memory pressure
-- Memory Clerk Usage for instance  (Query 35) (Memory Clerk Usage)
-- Look for high value for CACHESTORE_SQLCP (Ad-hoc query plans)
SELECT TOP(10) [type] AS [Memory Clerk Type], SUM(single_pages_kb)/1024 AS [SPA Memory Usage (MB)] 
FROM sys.dm_os_memory_clerks WITH (NOLOCK)
GROUP BY [type]  
ORDER BY SUM(single_pages_kb) DESC OPTION (RECOMPILE);

 -- CACHESTORE_SQLCP  SQL Plans         
-- These are cached SQL statements or batches that aren't in stored procedures, functions and triggers
-- Watch out for high values for CACHESTORE_SQLCP

 -- CACHESTORE_OBJCP  Object Plans      
-- These are compiled plans for stored procedures, functions and triggers
-- Find single-use, ad-hoc and prepared queries that are bloating the plan cache  (Query 36) (Ad hoc Queries)
SELECT TOP(50) [text] AS [QueryText], cp.cacheobjtype, cp.objtype, cp.size_in_bytes 
FROM sys.dm_exec_cached_plans AS cp WITH (NOLOCK)
CROSS APPLY sys.dm_exec_sql_text(plan_handle) 
WHERE cp.cacheobjtype = N'Compiled Plan' 
AND cp.objtype IN (N'Adhoc', N'Prepared') 
AND cp.usecounts = 1
ORDER BY cp.size_in_bytes DESC OPTION (RECOMPILE);

 -- Gives you the text, type and size of single-use ad-hoc and prepared queries that waste space in the plan cache
-- Enabling 'optimize for ad hoc workloads' for the instance can help (SQL Server 2008 and above only)
-- Running DBCC FREESYSTEMCACHE ('SQL Plans') periodically may be required to better control this.
-- Enabling forced parameterization for the database can help, but test first!
-- Database specific queries *****************************************************************

 -- **** Switch to a user database *****
USE YourDatabaseName;
GO

 -- Individual File Sizes and space available for current database  (Query 37) (File Sizes and Space)
SELECT f.name AS [File Name] , f.physical_name AS [Physical Name], 
CAST((f.size/128.0) AS DECIMAL(15,2)) AS [Total Size in MB],
CAST(f.size/128.0 - CAST(FILEPROPERTY(f.name, 'SpaceUsed') AS int)/128.0 AS DECIMAL(15,2)) 
AS [Available Space In MB], [file_id], fg.name AS [Filegroup Name]
FROM sys.database_files AS f WITH (NOLOCK) 
LEFT OUTER JOIN sys.data_spaces AS fg WITH (NOLOCK) 
ON f.data_space_id = fg.data_space_id OPTION (RECOMPILE);

 -- Look at how large and how full the files are and where they are located
-- Make sure the transaction log is not full!!

-- I/O Statistics by file for the current database  (Query 38) (IO Stats By File)
SELECT DB_NAME(DB_ID()) AS [Database Name], df.name AS [Logical Name], vfs.[file_id], 
df.physical_name AS [Physical Name], vfs.num_of_reads, vfs.num_of_writes, vfs.io_stall_read_ms, vfs.io_stall_write_ms,
CAST(100. * vfs.io_stall_read_ms/(vfs.io_stall_read_ms + vfs.io_stall_write_ms) AS DECIMAL(10,1)) AS [IO Stall Reads Pct],
CAST(100. * vfs.io_stall_write_ms/(vfs.io_stall_write_ms + vfs.io_stall_read_ms) AS DECIMAL(10,1)) AS [IO Stall Writes Pct],
(vfs.num_of_reads + vfs.num_of_writes) AS [Writes + Reads], 
CAST(vfs.num_of_bytes_read/1048576.0 AS DECIMAL(10, 2)) AS [MB Read], 
CAST(vfs.num_of_bytes_written/1048576.0 AS DECIMAL(10, 2)) AS [MB Written],
CAST(100. * vfs.num_of_reads/(vfs.num_of_reads + vfs.num_of_writes) AS DECIMAL(10,1)) AS [# Reads Pct],
CAST(100. * vfs.num_of_writes/(vfs.num_of_reads + vfs.num_of_writes) AS DECIMAL(10,1)) AS [# Write Pct],
CAST(100. * vfs.num_of_bytes_read/(vfs.num_of_bytes_read + vfs.num_of_bytes_written) AS DECIMAL(10,1)) AS [Read Bytes Pct],
CAST(100. * vfs.num_of_bytes_written/(vfs.num_of_bytes_read + vfs.num_of_bytes_written) AS DECIMAL(10,1)) AS [Written Bytes Pct]
FROM sys.dm_io_virtual_file_stats(DB_ID(), NULL) AS vfs
INNER JOIN sys.database_files AS df WITH (NOLOCK)
ON vfs.[file_id]= df.[file_id]
OPTION (RECOMPILE);

 -- This helps you characterize your workload better from an I/O perspective for this database
-- It helps you determine whether you has an OLTP or DW/DSS type of workload

-- Top cached queries by Execution Count (SQL Server 2008 R2)  (Query 39) (Query Execution Counts)
-- SQL Server 2008 R2 SP1 and greater only
SELECT TOP (100) qs.execution_count, qs.total_rows, qs.last_rows, qs.min_rows, qs.max_rows,
qs.last_elapsed_time, qs.min_elapsed_time, qs.max_elapsed_time,
total_worker_time, total_logical_reads, 
SUBSTRING(qt.TEXT,qs.statement_start_offset/2 +1,
(CASE WHEN qs.statement_end_offset = -1
THEN LEN(CONVERT(NVARCHAR(MAX), qt.TEXT)) * 2
  ELSE qs.statement_end_offset END - qs.statement_start_offset)/2) AS query_text 
FROM sys.dm_exec_query_stats AS qs WITH (NOLOCK)
CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) AS qt
ORDER BY qs.execution_count DESC OPTION (RECOMPILE);

 -- Uses several new rows returned columns to help troubleshoot performance problems
-- Top Cached SPs By Execution Count (SQL 2008 R2) (Query 40) (SP Execution Counts)
SELECT TOP(100) p.name AS [SP Name], qs.execution_count,
ISNULL(qs.execution_count/DATEDIFF(Minute, qs.cached_time, GETDATE()), 0) AS [Calls/Minute],
qs.total_worker_time/qs.execution_count AS [AvgWorkerTime], qs.total_worker_time AS [TotalWorkerTime],  
qs.total_elapsed_time, qs.total_elapsed_time/qs.execution_count AS [avg_elapsed_time],
qs.cached_time
FROM sys.procedures AS p WITH (NOLOCK)
INNER JOIN sys.dm_exec_procedure_stats AS qs WITH (NOLOCK)
ON p.[object_id] = qs.[object_id]
WHERE qs.database_id = DB_ID()
ORDER BY qs.execution_count DESC OPTION (RECOMPILE);

 -- Tells you which cached stored procedures are called the most often
-- This helps you characterize and baseline your workload
-- Top Cached SPs By Avg Elapsed Time (SQL 2008 R2)  (Query 41) (SP Avg Elapsed Time) 
SELECT TOP(25) p.name AS [SP Name], qs.total_elapsed_time/qs.execution_count AS [avg_elapsed_time], 
qs.total_elapsed_time, qs.execution_count, ISNULL(qs.execution_count/DATEDIFF(Minute, qs.cached_time, 
GETDATE()), 0) AS [Calls/Minute], qs.total_worker_time/qs.execution_count AS [AvgWorkerTime], 
qs.total_worker_time AS [TotalWorkerTime], qs.cached_time
FROM sys.procedures AS p WITH (NOLOCK)
INNER JOIN sys.dm_exec_procedure_stats AS qs WITH (NOLOCK)
ON p.[object_id] = qs.[object_id]
WHERE qs.database_id = DB_ID()
ORDER BY avg_elapsed_time DESC OPTION (RECOMPILE);

 -- This helps you find long-running cached stored procedures that
-- may be easy to optimize with standard query tuning techniques
-- Top Cached SPs By Avg Elapsed Time with execution time variability   (Query 42) (SP Avg Elapsed Variable Time)
SELECT TOP(25) p.name AS [SP Name], qs.execution_count, qs.min_elapsed_time,
qs.total_elapsed_time/qs.execution_count AS [avg_elapsed_time],
qs.max_elapsed_time, qs.last_elapsed_time,  qs.cached_time
FROM sys.procedures AS p WITH (NOLOCK)
INNER JOIN sys.dm_exec_procedure_stats AS qs WITH (NOLOCK)
ON p.[object_id] = qs.[object_id]
WHERE qs.database_id = DB_ID()
ORDER BY avg_elapsed_time DESC OPTION (RECOMPILE);

 -- This gives you some interesting information about the variability in the
-- execution time of your cached stored procedures, which is useful for tuning
-- Top Cached SPs By Total Worker time (SQL 2008 R2). Worker time relates to CPU cost  (Query 43) (SP Worker Time)
SELECT TOP(25) p.name AS [SP Name], qs.total_worker_time AS [TotalWorkerTime], 
qs.total_worker_time/qs.execution_count AS [AvgWorkerTime], qs.execution_count, 
ISNULL(qs.execution_count/DATEDIFF(Minute, qs.cached_time, GETDATE()), 0) AS [Calls/Minute],
qs.total_elapsed_time, qs.total_elapsed_time/qs.execution_count 
AS [avg_elapsed_time], qs.cached_time
FROM sys.procedures AS p WITH (NOLOCK)
INNER JOIN sys.dm_exec_procedure_stats AS qs WITH (NOLOCK)
ON p.[object_id] = qs.[object_id]
WHERE qs.database_id = DB_ID()
ORDER BY qs.total_worker_time DESC OPTION (RECOMPILE);

 -- This helps you find the most expensive cached stored procedures from a CPU perspective
-- You should look at this if you see signs of CPU pressure
-- Top Cached SPs By Total Logical Reads (SQL 2008 R2). Logical reads relate to memory pressure  (Query 44) (SP Logical Reads)
SELECT TOP(25) p.name AS [SP Name], qs.total_logical_reads AS [TotalLogicalReads], 
qs.total_logical_reads/qs.execution_count AS [AvgLogicalReads],qs.execution_count, 
ISNULL(qs.execution_count/DATEDIFF(Minute, qs.cached_time, GETDATE()), 0) AS [Calls/Minute], 
qs.total_elapsed_time, qs.total_elapsed_time/qs.execution_count 
AS [avg_elapsed_time], qs.cached_time
FROM sys.procedures AS p WITH (NOLOCK)
INNER JOIN sys.dm_exec_procedure_stats AS qs WITH (NOLOCK)
ON p.[object_id] = qs.[object_id]
WHERE qs.database_id = DB_ID()
ORDER BY qs.total_logical_reads DESC OPTION (RECOMPILE);

 -- This helps you find the most expensive cached stored procedures from a memory perspective
-- You should look at this if you see signs of memory pressure
-- Top Cached SPs By Total Physical Reads (SQL 2008 R2). Physical reads relate to disk I/O pressure  (Query 45) (SP Physical Reads)
SELECT TOP(25) p.name AS [SP Name],qs.total_physical_reads AS [TotalPhysicalReads], 
qs.total_physical_reads/qs.execution_count AS [AvgPhysicalReads], qs.execution_count, 
qs.total_logical_reads,qs.total_elapsed_time, qs.total_elapsed_time/qs.execution_count 
AS [avg_elapsed_time], qs.cached_time 
FROM sys.procedures AS p WITH (NOLOCK)
INNER JOIN sys.dm_exec_procedure_stats AS qs WITH (NOLOCK)
ON p.[object_id] = qs.[object_id]
WHERE qs.database_id = DB_ID()
AND qs.total_physical_reads > 0
ORDER BY qs.total_physical_reads DESC, qs.total_logical_reads DESC OPTION (RECOMPILE);

 -- This helps you find the most expensive cached stored procedures from a read I/O perspective
-- You should look at this if you see signs of I/O pressure or of memory pressure
       
-- Top Cached SPs By Total Logical Writes (SQL 2008 R2)  (Query 46) (SP Logical Writes)
-- Logical writes relate to both memory and disk I/O pressure 
SELECT TOP(25) p.name AS [SP Name], qs.total_logical_writes AS [TotalLogicalWrites], 
qs.total_logical_writes/qs.execution_count AS [AvgLogicalWrites], qs.execution_count,
ISNULL(qs.execution_count/DATEDIFF(Second, qs.cached_time, GETDATE()), 0) AS [Calls/Second],
qs.total_elapsed_time, qs.total_elapsed_time/qs.execution_count AS [avg_elapsed_time], 
qs.cached_time
FROM sys.procedures AS p WITH (NOLOCK)
INNER JOIN sys.dm_exec_procedure_stats AS qs WITH (NOLOCK)
ON p.[object_id] = qs.[object_id]
WHERE qs.database_id = DB_ID()
AND qs.total_logical_writes > 0
ORDER BY qs.total_logical_writes DESC OPTION (RECOMPILE);

 -- This helps you find the most expensive cached stored procedures from a write I/O perspective
-- You should look at this if you see signs of I/O pressure or of memory pressure
-- Lists the top statements by average input/output usage for the current database  (Query 47) (Top IO Statements)
SELECT TOP(50) OBJECT_NAME(qt.objectid, dbid) AS [SP Name],
(qs.total_logical_reads + qs.total_logical_writes) /qs.execution_count AS [Avg IO], qs.execution_count AS [Execution Count],
SUBSTRING(qt.[text],qs.statement_start_offset/2, 
(CASE 
WHEN qs.statement_end_offset = -1 
 THEN LEN(CONVERT(nvarchar(max), qt.[text])) * 2 
ELSE qs.statement_end_offset 
 END - qs.statement_start_offset)/2) AS [Query Text]
FROM sys.dm_exec_query_stats AS qs WITH (NOLOCK)
CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) AS qt
WHERE qt.[dbid] = DB_ID()
ORDER BY [Avg IO] DESC OPTION (RECOMPILE);

 -- Helps you find the most expensive statements for I/O by SP

-- Possible Bad NC Indexes (writes > reads)  (Query 48) (Bad NC Indexes)
SELECT OBJECT_NAME(s.[object_id]) AS [Table Name], i.name AS [Index Name], i.index_id, 
i.is_disabled, i.is_hypothetical, i.has_filter, i.fill_factor,
user_updates AS [Total Writes], user_seeks + user_scans + user_lookups AS [Total Reads],
user_updates - (user_seeks + user_scans + user_lookups) AS [Difference]
FROM sys.dm_db_index_usage_stats AS s WITH (NOLOCK)
INNER JOIN sys.indexes AS i WITH (NOLOCK)
ON s.[object_id] = i.[object_id]
AND i.index_id = s.index_id
WHERE OBJECTPROPERTY(s.[object_id],'IsUserTable') = 1
AND s.database_id = DB_ID()
AND user_updates > (user_seeks + user_scans + user_lookups)
AND i.index_id > 1
ORDER BY [Difference] DESC, [Total Writes] DESC, [Total Reads] ASC OPTION (RECOMPILE);

 -- Look for indexes with high numbers of writes and zero or very low numbers of reads
-- Consider your complete workload, and how long your instance has been running
-- Investigate further before dropping an index!
-- Missing Indexes for current database by Index Advantage  (Query 49) (Missing Indexes)
SELECT DISTINCT CONVERT(decimal(18,2), user_seeks * avg_total_user_cost * (avg_user_impact * 0.01)) AS [index_advantage], 
migs.last_user_seek, mid.[statement] AS [Database.Schema.Table],
mid.equality_columns, mid.inequality_columns, mid.included_columns,
migs.unique_compiles, migs.user_seeks, migs.avg_total_user_cost, migs.avg_user_impact,
OBJECT_NAME(mid.[object_id]) AS [Table Name], p.rows AS [Table Rows]
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
INNER JOIN sys.partitions AS p WITH (NOLOCK)
ON p.[object_id] = mid.[object_id]
WHERE mid.database_id = DB_ID() -- Remove this to see for entire instance
ORDER BY index_advantage DESC OPTION (RECOMPILE);

 -- Look at last user seek time, number of user seeks to help determine source and importance
-- SQL Server is overly eager to add included columns, so beware
-- Do not just blindly add indexes that show up from this query!!!
-- Find missing index warnings for cached plans in the current database  (Query 50) (Missing Index Warnings)
-- Note: This query could take some time on a busy instance
SELECT TOP(25) OBJECT_NAME(objectid) AS [ObjectName], 
               query_plan, cp.objtype, cp.usecounts
FROM sys.dm_exec_cached_plans AS cp WITH (NOLOCK)
CROSS APPLY sys.dm_exec_query_plan(cp.plan_handle) AS qp
WHERE CAST(query_plan AS NVARCHAR(MAX)) LIKE N'%MissingIndex%'
AND dbid = DB_ID()
ORDER BY cp.usecounts DESC OPTION (RECOMPILE);

 -- Helps you connect missing indexes to specific stored procedures
-- This can help you decide whether to add them or not
-- Breaks down buffers used by current database by object (table, index) in the buffer cache  (Query 51) (Buffer Usage)
-- Note: This query could take some time on a busy instance
SELECT OBJECT_NAME(p.[object_id]) AS [Object Name], p.index_id, 
CAST(COUNT(*)/128.0 AS DECIMAL(10, 2)) AS [Buffer size(MB)],  
COUNT(*) AS [BufferCount], p.Rows AS [Row Count],
p.data_compression_desc AS [Compression Type]
FROM sys.allocation_units AS a WITH (NOLOCK)
INNER JOIN sys.dm_os_buffer_descriptors AS b WITH (NOLOCK)
ON a.allocation_unit_id = b.allocation_unit_id
INNER JOIN sys.partitions AS p WITH (NOLOCK)
ON a.container_id = p.hobt_id
WHERE b.database_id = CONVERT(int,DB_ID())
AND p.[object_id] > 100
GROUP BY p.[object_id], p.index_id, p.data_compression_desc, p.[Rows]
ORDER BY [BufferCount] DESC OPTION (RECOMPILE);

 -- Tells you what tables and indexes are using the most memory in the buffer cache
-- It can help identify possible candidates for data compression
-- Get Table names, row counts, and compression status for clustered index or heap  (Query 52) (Table Sizes)
SELECT OBJECT_NAME(object_id) AS [ObjectName], 
SUM(Rows) AS [RowCount], data_compression_desc AS [CompressionType]
FROM sys.partitions WITH (NOLOCK)
WHERE index_id < 2 --ignore the partitions from the non-clustered index if any
AND OBJECT_NAME(object_id) NOT LIKE N'sys%'
AND OBJECT_NAME(object_id) NOT LIKE N'queue_%' 
AND OBJECT_NAME(object_id) NOT LIKE N'filestream_tombstone%' 
AND OBJECT_NAME(object_id) NOT LIKE N'fulltext%'
AND OBJECT_NAME(object_id) NOT LIKE N'ifts_comp_fragment%'
AND OBJECT_NAME(object_id) NOT LIKE N'xml_index_nodes%'
GROUP BY object_id, data_compression_desc
ORDER BY SUM(Rows) DESC OPTION (RECOMPILE);

 -- Gives you an idea of table sizes, and possible data compression opportunities

-- Get some key table properties (Query 53) (Table Properties)
SELECT [name], create_date, lock_on_bulk_load, is_replicated, has_replication_filter, 
       is_tracked_by_cdc, lock_escalation_desc
FROM sys.tables WITH (NOLOCK) 
ORDER BY [name] OPTION (RECOMPILE);

 -- Gives you some good information about your tables
-- When were Statistics last updated on all indexes?  (Query 54) (Statistics Update)
SELECT o.name, i.name AS [Index Name],  
      STATS_DATE(i.[object_id], i.index_id) AS [Statistics Date], 
      s.auto_created, s.no_recompute, s.user_created, st.row_count,
  st.used_page_count
FROM sys.objects AS o WITH (NOLOCK)
INNER JOIN sys.indexes AS i WITH (NOLOCK)
ON o.[object_id] = i.[object_id]
INNER JOIN sys.stats AS s WITH (NOLOCK)
ON i.[object_id] = s.[object_id] 
AND i.index_id = s.stats_id
INNER JOIN sys.dm_db_partition_stats AS st WITH (NOLOCK)
ON o.[object_id] = st.[object_id]
AND i.[index_id] = st.[index_id]
WHERE o.[type] = 'U'
ORDER BY STATS_DATE(i.[object_id], i.index_id) ASC OPTION (RECOMPILE);  

 -- Helps discover possible problems with out-of-date statistics
-- Also gives you an idea which indexes are the most active
-- Get fragmentation info for all indexes above a certain size in the current database  (Query 55) (Index Fragmentation)
-- Note: This could take some time on a very large database
SELECT DB_NAME(ps.database_id) AS [Database Name], OBJECT_NAME(ps.OBJECT_ID) AS [Object Name], 
i.name AS [Index Name], ps.index_id, ps.index_type_desc, ps.avg_fragmentation_in_percent, 
ps.fragment_count, ps.page_count, i.fill_factor, i.has_filter, i.filter_definition
FROM sys.dm_db_index_physical_stats(DB_ID(),NULL, NULL, NULL , N'LIMITED') AS ps
INNER JOIN sys.indexes AS i WITH (NOLOCK)
ON ps.[object_id] = i.[object_id] 
AND ps.index_id = i.index_id
WHERE ps.database_id = DB_ID()
AND ps.page_count > 2500
ORDER BY ps.avg_fragmentation_in_percent DESC OPTION (RECOMPILE);

 -- Helps determine whether you have framentation in your relational indexes
-- and how effective your index maintenance strategy is
--- Index Read/Write stats (all tables in current DB) ordered by Reads  (Query 56) (Overall Index Usage - Reads)
SELECT OBJECT_NAME(s.[object_id]) AS [ObjectName], i.name AS [IndexName], i.index_id,
   user_seeks + user_scans + user_lookups AS [Reads], s.user_updates AS [Writes],  
   i.type_desc AS [IndexType], i.fill_factor AS [FillFactor], i.has_filter, i.filter_definition, 
   s.last_user_scan, s.last_user_lookup, s.last_user_seek
FROM sys.dm_db_index_usage_stats AS s WITH (NOLOCK)
INNER JOIN sys.indexes AS i WITH (NOLOCK)
ON s.[object_id] = i.[object_id]
WHERE OBJECTPROPERTY(s.[object_id],'IsUserTable') = 1
AND i.index_id = s.index_id
AND s.database_id = DB_ID()
ORDER BY user_seeks + user_scans + user_lookups DESC OPTION (RECOMPILE); -- Order by reads
-- Show which indexes in the current database are most active for Reads
--- Index Read/Write stats (all tables in current DB) ordered by Writes  (Query 57) (Overall Index Usage - Writes)
SELECT OBJECT_NAME(s.[object_id]) AS [ObjectName], i.name AS [IndexName], i.index_id,
   s.user_updates AS [Writes], user_seeks + user_scans + user_lookups AS [Reads], 
   i.type_desc AS [IndexType], i.fill_factor AS [FillFactor], i.has_filter, i.filter_definition,
   s.last_system_update, s.last_user_update
FROM sys.dm_db_index_usage_stats AS s WITH (NOLOCK)
INNER JOIN sys.indexes AS i WITH (NOLOCK)
ON s.[object_id] = i.[object_id]
WHERE OBJECTPROPERTY(s.[object_id],'IsUserTable') = 1
AND i.index_id = s.index_id
AND s.database_id = DB_ID()
ORDER BY s.user_updates DESC OPTION (RECOMPILE);  -- Order by writes

 -- Show which indexes in the current database are most active for Writes
-- Look at recent Full backups for the current database (Query 58) (Recent Full Backups)
SELECT TOP (30) bs.machine_name, bs.server_name, bs.database_name AS [Database Name], bs.recovery_model,
CONVERT (BIGINT, bs.backup_size / 1048576 ) AS [Uncompressed Backup Size (MB)],
CONVERT (BIGINT, bs.compressed_backup_size / 1048576 ) AS [Compressed Backup Size (MB)],
CONVERT (NUMERIC (20,2), (CONVERT (FLOAT, bs.backup_size) /
CONVERT (FLOAT, bs.compressed_backup_size))) AS [Compression Ratio], 
DATEDIFF (SECOND, bs.backup_start_date, bs.backup_finish_date) AS [Backup Elapsed Time (sec)],
bs.backup_finish_date AS [Backup Finish Date]
FROM msdb.dbo.backupset AS bs WITH (NOLOCK)
WHERE DATEDIFF (SECOND, bs.backup_start_date, bs.backup_finish_date) > 0 
AND bs.backup_size > 0
AND bs.type = 'D' -- Change to L if you want Log backups
AND database_name = DB_NAME(DB_ID())
ORDER BY bs.backup_finish_date DESC OPTION (RECOMPILE);

 -- Are your backup sizes and times changing over time?
-- Get the average full backup size by month for the current database (SQL 2008) (Query 59) (Database Size History)
-- This helps you understand your database growth over time
-- Adapted from Erin Stellato
SELECT [database_name] AS [Database], DATEPART(month,[backup_start_date]) AS [Month],
CAST(AVG([backup_size]/1024/1024) AS DECIMAL(15,2)) AS [Backup Size (MB)],
CAST(AVG([compressed_backup_size]/1024/1024) AS DECIMAL(15,2)) AS [Compressed Backup Size (MB)],
CAST(AVG([backup_size]/[compressed_backup_size]) AS DECIMAL(15,2)) AS [Compression Ratio]
FROM msdb.dbo.backupset WITH (NOLOCK)
WHERE [database_name] = DB_NAME(DB_ID())
AND [type] = 'D'
AND backup_start_date >= DATEADD(MONTH, -12, GETDATE())
GROUP BY [database_name],DATEPART(mm,[backup_start_date]) OPTION (RECOMPILE);

 -- The Backup Size (MB) (without backup compression) shows the true size of your database over time
-- This helps you track and plan your data size growth
-- It is possible that your data files may be larger on disk due to empty space within those files

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