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The Importance of Wait Statistics
in Monitoring SQL Server
Grant Fritchey
Get in touch
scarydba.com
grant@scarydba.com
@gfritchey
Grant Fritchey
What is a Wait?
• SQL Server does work
• All the work doesn’t occur simultaneously
• When a unit of work stops
• Threads
– RUNNING
– SUSPENDED
– RUNNABLE
• Time spent between RUNNING and RUNNING
Why Are Waits Important?
• Why is the server slow
• Where is the server slow
• Which resources are waiting frequently
• Which resources are waiting long
• Direct pointer to the cause of poor performance
Where Do I Get Waits
• Sys.dm_os_wait_stats
• Sys.dm_db_wait_stats
• sys.dm_os_latch_stats
Are Some Waits More Important?
• LATCH_*, PAGELATCH_*
• PAGEIOLATCH_*, IO_COMPLETION, WRITELOG
• CXPACKET
• ASYNC_NETWORK_IO
• RESOURCE_SEMAPHORE
• BACKUPIO
• Lots and lots more
• signal_wait_time_ms
Are Some Waits Less Important?
• CXPACKET
• WAITFOR
• CLR_SEMAPHORE
• BROKER_RECEIVE_WAITFOR
• ONDEMAND_TASK_QUEUE
• Lots and lots more
How Do I Use This Information?
• Filter out the unimportant waits
• You know where your system bottlenecks are
• Is it system related?
• Is it query related?
• Is it structure related?
How Do I Know Which Queries
Are Waiting?
• Sys.dm_os_waiting_tasks
How Do I Know Which Waits A
Query Has?
• Sys.dm_exec_requests
• Extended Events: wait_info
What Happens To Waits Over
Time?
• DBCC SQLPERF(“sys.dm_os_wait_stats”,CLEAR)
• DBCC SQLPERF(“sys.dm_os_latch_stats”,CLEAR)
• Instance restart
DEMO: Wait Stats in SQL
Monitor
SQL Monitor
• Clear insights into SQL Server performance
in real time
• Embedded expertise
• Alerting
• Baselines
• Wait stats & expensive queries
• Custom Metrics
• SQL Monitor
SQL Monitor
• Read more experiences of SQL Monitor from real customers at: www.red-
gate.com/products/dba/sql-monitor
• We use it to monitor SQLServerCentral, if you want to see how it works:
http://monitor.red-gate.com
Its very simple to use and doesn’t
drown me in unnecessary
information. It came out on top for
being reasonably priced and also
functionality. We now have a stable
SQL Estate due to SQL Monitor.
Nic Hopper, Senior DBA, Atrium Underwriters Ltd
Documents
• SQL Server Performance Tuning Using Wait Statistics
• Performance Tuning Using Waits and Queues (old, but still good)
• Wait statistics, or please tell me where it hurts – Paul Randal
• What Queries Are Causing My Waits – John Sterret
Thank you for your attention
Q & A
The Importance of Wait Statistics in SQL Server
The Importance of Wait Statistics in SQL Server

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The Importance of Wait Statistics in SQL Server

  • 1. The Importance of Wait Statistics in Monitoring SQL Server Grant Fritchey
  • 3. What is a Wait? • SQL Server does work • All the work doesn’t occur simultaneously • When a unit of work stops • Threads – RUNNING – SUSPENDED – RUNNABLE • Time spent between RUNNING and RUNNING
  • 4. Why Are Waits Important? • Why is the server slow • Where is the server slow • Which resources are waiting frequently • Which resources are waiting long • Direct pointer to the cause of poor performance
  • 5. Where Do I Get Waits • Sys.dm_os_wait_stats • Sys.dm_db_wait_stats • sys.dm_os_latch_stats
  • 6. Are Some Waits More Important? • LATCH_*, PAGELATCH_* • PAGEIOLATCH_*, IO_COMPLETION, WRITELOG • CXPACKET • ASYNC_NETWORK_IO • RESOURCE_SEMAPHORE • BACKUPIO • Lots and lots more • signal_wait_time_ms
  • 7. Are Some Waits Less Important? • CXPACKET • WAITFOR • CLR_SEMAPHORE • BROKER_RECEIVE_WAITFOR • ONDEMAND_TASK_QUEUE • Lots and lots more
  • 8. How Do I Use This Information? • Filter out the unimportant waits • You know where your system bottlenecks are • Is it system related? • Is it query related? • Is it structure related?
  • 9. How Do I Know Which Queries Are Waiting? • Sys.dm_os_waiting_tasks
  • 10. How Do I Know Which Waits A Query Has? • Sys.dm_exec_requests • Extended Events: wait_info
  • 11. What Happens To Waits Over Time? • DBCC SQLPERF(“sys.dm_os_wait_stats”,CLEAR) • DBCC SQLPERF(“sys.dm_os_latch_stats”,CLEAR) • Instance restart
  • 12. DEMO: Wait Stats in SQL Monitor
  • 13. SQL Monitor • Clear insights into SQL Server performance in real time • Embedded expertise • Alerting • Baselines • Wait stats & expensive queries • Custom Metrics • SQL Monitor
  • 14. SQL Monitor • Read more experiences of SQL Monitor from real customers at: www.red- gate.com/products/dba/sql-monitor • We use it to monitor SQLServerCentral, if you want to see how it works: http://monitor.red-gate.com
  • 15. Its very simple to use and doesn’t drown me in unnecessary information. It came out on top for being reasonably priced and also functionality. We now have a stable SQL Estate due to SQL Monitor. Nic Hopper, Senior DBA, Atrium Underwriters Ltd
  • 16. Documents • SQL Server Performance Tuning Using Wait Statistics • Performance Tuning Using Waits and Queues (old, but still good) • Wait statistics, or please tell me where it hurts – Paul Randal • What Queries Are Causing My Waits – John Sterret
  • 17. Thank you for your attention Q & A

Editor's Notes

  1. Remember, you’ll always have waits.
  2. Sys.dm_os_wait_stats clears on restart, you can also use DBCC SQLPERF
  3. Cautions regarding looking at any single value. All must evaluated as a part of all the other stuff