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-- SQL Server 2012 Diagnostic Information Queries -- Glenn Berry -- April 2015 -- Last Modified: April 27, 2015 -- http://sqlserverperformance.wordpress.com/ -- http://sqlskills.com/blogs/glenn/ -- Twitter: GlennAlanBerry -- Please listen to my Pluralsight courses -- http://www.pluralsight.com/author/glenn-berry -- Many of these queries will not work if you have databases in 80 compatibility mode -- Please make sure you are using the correct version of these diagnostic queries for your version of SQL Server --****************************************************************************** --* Copyright (C) 2015 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. --* --****************************************************************************** -- 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 -- 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 (this includes the AlwaysOn AG hotfix that is in SP2 CU5) -- 11.0.3487 SP1 CU15 3/16/2015 11.0.5582 SP2 CU5 3/16/2015 -- The SQL Server 2012 builds that were released after SQL Server 2012 was released -- http://support.microsoft.com/kb/2692828 -- The SQL Server 2012 builds that were released after SQL Server 2012 Service Pack 1 was released -- http://support.microsoft.com/kb/2772858 -- SQL Server 2012 SP2 build versions (new format for the build list KB article) -- http://support.microsoft.com/kb/2983249 -- Recommended updates and configuration options for SQL Server 2012 and SQL Server 2014 used with high-performance workloads -- http://support.microsoft.com/kb/2964518/EN-US -- Performance and Stability Related Fixes in Post-SQL Server 2012 SP2 Builds -- http://www.sqlskills.com/blogs/glenn/performance-and-stability-related-fixes-in-post-sql-server-2012-sp2-builds/ -- When was SQL Server installed (Query 2) (SQL Server Install Date) SELECT @@SERVERNAME AS [Server Name], create_date AS [SQL Server Install Date] FROM sys.server_principals WITH (NOLOCK) WHERE name = N‘NT AUTHORITY\SYSTEM‘ OR name = N‘NT AUTHORITY\NETWORK SERVICE‘ OPTION (RECOMPILE); -- 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 2012) (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], SERVERPROPERTY(‘IsHadrEnabled‘) AS [IsHadrEnabled], SERVERPROPERTY(‘HadrManagerStatus‘) AS [HadrManagerStatus]; -- This gives you a lot of useful information about your instance of SQL Server, -- such as the ProcessID for SQL Server and your collation -- The last two columns are new for SQL Server 2012 -- 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, sj.notify_level_email, sc.name AS [CategoryName], 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 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 -- http://msdn.microsoft.com/en-us/library/ms189817.aspx -- 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, 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 -- http://support2.microsoft.com/kb/2154845 -- Windows information (SQL Server 2012) (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 -- 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 -- 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 -- http://msdn.microsoft.com/en-us/library/ms143506.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 2012) (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 processid, when they were last started, and their current status -- Shows whether you are running on a failover cluster instance -- SQL Server NUMA Node information (Query 9) (SQL Server NUMA Info) SELECT node_id, node_state_desc, memory_node_id, processor_group, online_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 -- Hardware information from SQL Server 2012 (Query 10) (Hardware Info) -- (Cannot distinguish between HT and multi-core) 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], 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 -- 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 -- 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 sys.xp_readerrorlog 0, 1, N‘Manufacturer‘; -- This can help you determine the capabilities -- and capacities of your database server -- Get socket, physical core and logical core count from (Query 12) (Core Counts) -- SQL Server Error log. This query might take a few seconds -- if you have not recycled your error log recently 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 20 logical processors based on SQL Server licensing" which means grandfathered Server/CAL licensing -- Note: If you recycle your error logs frequently and your instance has been running long enough, -- this query may not return any results, since the original startup information from the first error log -- when SQL Server was last started will have been overwritten -- Get processor description from Windows Registry (Query 13) (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 that the rated clock speed due -- to the Windows Power Plan or hardware power management -- You can skip the next four queries if you know you don‘t -- have a clustered instance -- Shows you where the SQL Server failover cluster diagnostic log is located and how it is configured (Query 14) (SQL Server Error Log) SELECT is_enabled, [path], max_size, max_files FROM sys.dm_os_server_diagnostics_log_configurations WITH (NOLOCK) OPTION (RECOMPILE); -- Knowing this information is important for troubleshooting purposes -- Also shows you the location of other error and diagnostic log files -- Get information about your OS cluster (if your database server is in a cluster) (Query 15) (Cluster Properties) SELECT VerboseLogging, SqlDumperDumpFlags, SqlDumperDumpPath, SqlDumperDumpTimeOut, FailureConditionLevel, HealthCheckTimeout FROM sys.dm_os_cluster_properties WITH (NOLOCK) OPTION (RECOMPILE); -- You will see no results if your instance is not clustered -- Get information about your cluster nodes and their status (Query 16) (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 -- Get information about any AlwaysOn AG cluster this instance is a part of (Query 17) (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 -- Recommended hotfixes and updates for Windows Server 2012 R2-based failover clusters -- http://support.microsoft.com/kb/2920151 -- Get configuration values for instance (Query 18) (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) -- 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) -- Get information about TCP Listener for SQL Server (Query 19) (TCP Listener States) SELECT listener_id, ip_address, is_ipv4, port, type_desc, state_desc, start_time FROM sys.dm_tcp_listener_states WITH (NOLOCK) ORDER BY listener_id OPTION (RECOMPILE); -- Helpful for network and connectivity troubleshooting -- Get information on location, time and size of any memory dumps from SQL Server (Query 20) (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) -- File names and paths for TempDB and all user databases in instance (Query 21) (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] 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 LUNS that have database files on the current instance (Query 22) (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 -- Look for I/O requests taking longer than 15 seconds in the five most recent SQL Server Error Logs (Query 23) (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‘; 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) -- Drive level latency information (Query 24) (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 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(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 20-25ms is usually a problem -- Calculates average stalls per read, per write, and per total input/output for each database file (Query 25) (IO Stalls 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_stall_ms], CAST(fs.io_stall_write_ms/(1.0 + fs.num_of_writes) AS NUMERIC(10,1)) AS [avg_write_stall_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_stall_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_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 or perhaps improve your I/O performance -- Recovery model, log reuse wait description, log file size, log usage size (Query 26) (Database Properties) -- and compatibility level for all databases on instance SELECT db.[name] AS [Database Name], db.recovery_model_desc AS [Recovery Model], db.state_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 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 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 27) (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 28) (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 -- and they can make database restores and recovery take much longer -- Try to keep your VLF counts under 200 in most cases -- Get CPU utilization by database (Query 29) (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 -- Get I/O utilization by database (Query 30) (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 31) (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 32) (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‘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.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 (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] FROM Waits AS W1 INNER JOIN Waits AS W2 ON W2.RowNum <= W1.RowNum GROUP BY W1.RowNum 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 -- 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 -- Signal Waits for instance (Query 33) (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) 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‘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‘) OPTION (RECOMPILE); -- Signal Waits above 10-15% is usually a confirming sign of CPU pressure -- Cumulative wait stats are not as useful on an idle instance that is not under load or performance pressure -- Resource waits are non-CPU related waits -- Get logins that are connected and how many sessions they have (Query 34) (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 a count of SQL connections by IP address (Query 35) (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 -- Get Average Task Counts (run multiple times) (Query 36) (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/deadlocking or other resource contention -- Sustained values above 1 suggest further investigation in that area -- 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 37) (CPU Utilization History) -- This version works with SQL Server 2012 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 -- Get top total worker time queries for entire instance (Query 38) (Top Worker Time Queries) SELECT TOP(50) DB_NAME(t.[dbid]) AS [Database Name], LEFT(t.[text], 255) AS [Short Query Text], qs.total_worker_time AS [Total Worker Time], qs.min_worker_time AS [Min Worker Time], qs.total_worker_time/qs.execution_count AS [Avg Worker Time], qs.max_worker_time AS [Max Worker Time], qs.execution_count AS [Execution Count], qs.total_elapsed_time/qs.execution_count AS [Avg Elapsed Time], qs.total_logical_reads/qs.execution_count AS [Avg Logical Reads], qs.total_physical_reads/qs.execution_count AS [Avg Physical Reads], qs.creation_time AS [Creation Time] --, t.[text] AS [Query Text], qp.query_plan AS [Query Plan] -- uncomment out these columns if not copying results to Excel FROM sys.dm_exec_query_stats AS qs WITH (NOLOCK) CROSS APPLY sys.dm_exec_sql_text(plan_handle) AS t CROSS APPLY sys.dm_exec_query_plan(plan_handle) AS qp ORDER BY qs.total_worker_time DESC OPTION (RECOMPILE); -- Helps you find the most expensive queries from a CPU perspective across the entire instance -- Good basic information about OS memory amounts and state (Query 39) (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 40) (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 41) (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 over time, not the absolute value. -- This will only return one row for non-NUMA systems. -- Memory Grants Pending value for current instance (Query 42) (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 43) (Memory Clerk Usage) -- Look for high value for CACHESTORE_SQLCP (Ad-hoc query plans) SELECT TOP(10) mc.[type] AS [Memory Clerk Type], CAST((SUM(mc.pages_kb)/1024.0) AS DECIMAL (15,2)) AS [Memory Usage (MB)] FROM sys.dm_os_memory_clerks AS mc WITH (NOLOCK) GROUP BY mc.[type] ORDER BY SUM(mc.pages_kb) DESC OPTION (RECOMPILE); -- MEMORYCLERK_SQLBUFFERPOOL is new for SQL Server 2012. It should be your highest consumer of memory -- 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 44) (Ad hoc Queries) SELECT TOP(50) [text] AS [QueryText], cp.cacheobjtype, cp.objtype, cp.size_in_bytes/1024 AS [Plan Size in KB] 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; -- make sure to change to an actual database on your instance GO -- Individual File Sizes and space available for current database (Query 45) (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 46) (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 2012) (Query 47) (Query Execution Counts) 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 WHERE qt.dbid = DB_ID() 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 Server 2012) (Query 48) (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 Server 2012) (Query 49) (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 (SQL Server 2012) (Query 50) (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 Server 2012). Worker time relates to CPU cost (Query 51) (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 Server 2012). Logical reads relate to memory pressure (Query 52) (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 Server 2012). Physical reads relate to disk I/O pressure (Query 53) (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 Server 2012) (Query 54) (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(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() 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 55) (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 56) (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 57) (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() ORDER BY index_advantage DESC OPTION (RECOMPILE); -- Look at index advantage, 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 58) (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 or queries -- 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 59) (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 60) (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‘filetable_updates%‘ 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 61) (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 -- Detect blocking (run multiple times) (Query 62) (Detect Blocking) SELECT t1.resource_type AS [lock type], DB_NAME(resource_database_id) AS [database], t1.resource_associated_entity_id AS [blk object],t1.request_mode AS [lock req], --- lock requested t1.request_session_id AS [waiter sid], t2.wait_duration_ms AS [wait time], -- spid of waiter (SELECT [text] FROM sys.dm_exec_requests AS r WITH (NOLOCK) -- get sql for waiter CROSS APPLY sys.dm_exec_sql_text(r.[sql_handle]) WHERE r.session_id = t1.request_session_id) AS [waiter_batch], (SELECT SUBSTRING(qt.[text],r.statement_start_offset/2, (CASE WHEN r.statement_end_offset = -1 THEN LEN(CONVERT(nvarchar(max), qt.[text])) * 2 ELSE r.statement_end_offset END - r.statement_start_offset)/2) FROM sys.dm_exec_requests AS r WITH (NOLOCK) CROSS APPLY sys.dm_exec_sql_text(r.[sql_handle]) AS qt WHERE r.session_id = t1.request_session_id) AS [waiter_stmt], -- statement blocked t2.blocking_session_id AS [blocker sid], -- spid of blocker (SELECT [text] FROM sys.sysprocesses AS p -- get sql for blocker CROSS APPLY sys.dm_exec_sql_text(p.[sql_handle]) WHERE p.spid = t2.blocking_session_id) AS [blocker_stmt] FROM sys.dm_tran_locks AS t1 WITH (NOLOCK) INNER JOIN sys.dm_os_waiting_tasks AS t2 WITH (NOLOCK) ON t1.lock_owner_address = t2.resource_address OPTION (RECOMPILE); -- Helps troubleshoot blocking and deadlocking issues -- The results will change from second to second on a busy system -- You should run this query multiple times when you see signs of blocking -- When were Statistics last updated on all indexes? (Query 63) (Statistics Update) SELECT SCHEMA_NAME(o.Schema_ID) + N‘.‘ + o.NAME AS [Object Name], o.type_desc AS [Object Type], 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, s.is_temporary, 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] IN (‘U‘, ‘V‘) AND st.row_count > 0 ORDER BY STATS_DATE(i.[object_id], i.index_id) DESC OPTION (RECOMPILE); -- Helps discover possible problems with out-of-date statistics -- Also gives you an idea which indexes are the most active -- Look at most frequently modified indexes and statistics (Query 64) (Volatile Indexes) SELECT o.name AS [Object Name], o.[object_id], o.type_desc, s.name AS [Statistics Name], s.stats_id, s.no_recompute, s.auto_created, sp.modification_counter, sp.rows, sp.rows_sampled, sp.last_updated FROM sys.objects AS o WITH (NOLOCK) INNER JOIN sys.stats AS s WITH (NOLOCK) ON s.object_id = o.object_id CROSS APPLY sys.dm_db_stats_properties(s.object_id, s.stats_id) AS sp WHERE o.type_desc NOT IN (N‘SYSTEM_TABLE‘, N‘INTERNAL_TABLE‘) AND sp.modification_counter > 0 ORDER BY sp.modification_counter DESC, o.name OPTION (RECOMPILE); -- Get fragmentation info for all indexes above a certain size in the current database (Query 65) (Index Fragmentation) -- Note: This query 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 66) (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 67) (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 -- Get lock waits for current database (Query 68) (Lock Waits) SELECT o.name AS [table_name], i.name AS [index_name], ios.index_id, ios.partition_number, SUM(ios.row_lock_wait_count) AS [total_row_lock_waits], SUM(ios.row_lock_wait_in_ms) AS [total_row_lock_wait_in_ms], SUM(ios.page_lock_wait_count) AS [total_page_lock_waits], SUM(ios.page_lock_wait_in_ms) AS [total_page_lock_wait_in_ms], SUM(ios.page_lock_wait_in_ms)+ SUM(row_lock_wait_in_ms) AS [total_lock_wait_in_ms] FROM sys.dm_db_index_operational_stats(DB_ID(), NULL, NULL, NULL) AS ios INNER JOIN sys.objects AS o WITH (NOLOCK) ON ios.[object_id] = o.[object_id] INNER JOIN sys.indexes AS i WITH (NOLOCK) ON ios.[object_id] = i.[object_id] AND ios.index_id = i.index_id WHERE o.[object_id] > 100 GROUP BY o.name, i.name, ios.index_id, ios.partition_number HAVING SUM(ios.page_lock_wait_in_ms)+ SUM(row_lock_wait_in_ms) > 0 ORDER BY total_lock_wait_in_ms DESC OPTION (RECOMPILE); -- This query is helpful for troubleshooting blocking and deadlocking issues -- Look at recent Full backups for the current database (Query 69) (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? -- Are you using backup compression? -- These three Pluralsight Courses go into more detail about how to run these queries and interpret the results -- SQL Server 2014 DMV Diagnostic Queries ? Part 1 -- http://www.pluralsight.com/courses/sql-server-2014-dmv-diagnostic-queries-part1 -- SQL Server 2014 DMV Diagnostic Queries ? Part 2 -- http://www.pluralsight.com/courses/sql-server-2014-dmv-diagnostic-queries-part2 -- SQL Server 2014 DMV Diagnostic Queries ? Part 3 -- http://www.pluralsight.com/courses/sql-server-2014-dmv-diagnostic-queries-part3
非常全面的SQL Server巡检脚本来自sqlskills团队的Glenn Berry 大牛
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原文地址：http://www.cnblogs.com/davidhou/p/5569532.html
