Slide deck used for my SQL Saturday 76 presentatio on "Debugging the deadlock for the scheduler"

2. www.TroubleshootingSQL.com
www.troubleshootingsql.com
http://twitter.com/banerjeeamit http://twitter.com/TblShootingSQL
www.facebook.com/TroubleshootingSQL

3. • What is a Deadlocked Scheduler?
• What are my options?
• Common Reasons
• Proactive action
• Reactive action

4. Scheduler • A scheduler is a logical CPU that is used by SQL
Server workers
Worker thread • Only a single worker can own the scheduler
Reason • Out of worker threads to process incoming
requests
• When a deadlocked scheduler issue is detected
17888 and over 50 percent of the workers are waiting on
a common resource type

5. DAC Notifications Post-mortem
• Collect DMV • Windows Event • Analyze the
outputs Log alerts logs
• Alerts on new • Debug the
memory dump memory dump
files

6. All schedulers have encountered a 17883
condition
All workers are blocked on a critical
resource. Eg. Spinlocks
All workers are executing a long-running
query: Parallelism and Lock Blocking
Open Transactions

9. www.troubleshootingsql.com
http://twitter.com/banerjeeamit
http://twitter.com/TblShootingSQL
www.facebook.com/TroubleshootingSQL
http://www.sqlserverlaunch.com/ww/Home

11. http://msdn.microsoft.com/en-us/library/cc917684.aspx
http://troubleshootingsql.com/tag/deadlocked-schedulers/
http://msdn.microsoft.com/en-us/windows/hardware/gg463009
http://msdl.microsoft.com/download/symbols
http://support.microsoft.com/kb/319892/en-us