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The Query Store SQL Tuning

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Grant Fritchey
Grant Fritchey

The Query Store, part of Azure SQL Database and SQL Server 2016, changes the way query performance tuning will be done. Learn about this new technology, how it works and how to apply it.

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Grant Fritchey | www.ScaryDBA.com www.ScaryDBA.com The Query Store and SQL Tuning Grant Fritchey – Red Gate Software
Grant Fritchey | www.ScaryDBA.com Goal  Understand the information and mechanisms behind the Query Store  Learn how to work with and maintain the Query Store  Discover new opportunities and mechanisms for dealing with query performance tuning issues 2
Grant Fritchey | www.ScaryDBA.com Get in touch scarydba.com grant@scarydba.com @gfritchey Grant Fritchey
Grant Fritchey | www.ScaryDBA.com 4
Grant Fritchey | www.ScaryDBA.com 5
Grant Fritchey | www.ScaryDBA.com 6
Grant Fritchey | www.ScaryDBA.com Query Store 7
Grant Fritchey | www.ScaryDBA.com Query Store 8 Plan Store Runtime Statistics Query Optimization Process Async Query Execution Async
Grant Fritchey | www.ScaryDBA.com Query Store Data 9
Grant Fritchey | www.ScaryDBA.com Query Store Lives 10 SQL Server 2016 Azure SQL Database 2014?
Grant Fritchey | www.ScaryDBA.com You control… 11 Turn it on or Off Time to flush to disk Size of storage Days in storage Plans per query limit Automatic cleanup Capture Mode Aggregation Interval Length
Grant Fritchey | www.ScaryDBA.com 12 Queries • Execution count • Duration • CPU • Compile ExecutionPlans • Estimated Plan • More than one per query
Grant Fritchey | www.ScaryDBA.com Monitoring 13 Extended Events Wait Statistics
Grant Fritchey | www.ScaryDBA.com In-Memory OLTP 14 Exactly the same Except • Not persisted • sys.sp_xtp_control_query_exec_stats • Plan forcing can fail • No memory grants • Need to recompile to capture metrics
Grant Fritchey | www.ScaryDBA.com Plan Forcing 15 Plan Store Runtime Statistics Query Optimization Process Async Query Execution Async Plan forcing
Grant Fritchey | www.ScaryDBA.com Goal  Understand the information and mechanisms behind the Query Store  Learn how to work with and maintain the Query Store  Discover new opportunities and mechanisms for dealing with query performance tuning issues 16
Grant Fritchey | www.ScaryDBA.com Get in touch scarydba.com grant@scarydba.com @gfritchey Grant Fritchey
Grant Fritchey | www.ScaryDBA.com Questions? 18
Grant Fritchey | www.ScaryDBA.com Photo Credits  Meteor  London  Flight data recorder  Undo button 19

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The Query Store SQL Tuning

  • 1. Grant Fritchey | www.ScaryDBA.com www.ScaryDBA.com The Query Store and SQL Tuning Grant Fritchey – Red Gate Software
  • 2. Grant Fritchey | www.ScaryDBA.com Goal  Understand the information and mechanisms behind the Query Store  Learn how to work with and maintain the Query Store  Discover new opportunities and mechanisms for dealing with query performance tuning issues 2
  • 3. Grant Fritchey | www.ScaryDBA.com Get in touch scarydba.com grant@scarydba.com @gfritchey Grant Fritchey
  • 4. Grant Fritchey | www.ScaryDBA.com 4
  • 5. Grant Fritchey | www.ScaryDBA.com 5
  • 6. Grant Fritchey | www.ScaryDBA.com 6
  • 7. Grant Fritchey | www.ScaryDBA.com Query Store 7
  • 8. Grant Fritchey | www.ScaryDBA.com Query Store 8 Plan Store Runtime Statistics Query Optimization Process Async Query Execution Async
  • 9. Grant Fritchey | www.ScaryDBA.com Query Store Data 9
  • 10. Grant Fritchey | www.ScaryDBA.com Query Store Lives 10 SQL Server 2016 Azure SQL Database 2014?
  • 11. Grant Fritchey | www.ScaryDBA.com You control… 11 Turn it on or Off Time to flush to disk Size of storage Days in storage Plans per query limit Automatic cleanup Capture Mode Aggregation Interval Length
  • 12. Grant Fritchey | www.ScaryDBA.com 12 Queries • Execution count • Duration • CPU • Compile ExecutionPlans • Estimated Plan • More than one per query
  • 13. Grant Fritchey | www.ScaryDBA.com Monitoring 13 Extended Events Wait Statistics
  • 14. Grant Fritchey | www.ScaryDBA.com In-Memory OLTP 14 Exactly the same Except • Not persisted • sys.sp_xtp_control_query_exec_stats • Plan forcing can fail • No memory grants • Need to recompile to capture metrics
  • 15. Grant Fritchey | www.ScaryDBA.com Plan Forcing 15 Plan Store Runtime Statistics Query Optimization Process Async Query Execution Async Plan forcing
  • 16. Grant Fritchey | www.ScaryDBA.com Goal  Understand the information and mechanisms behind the Query Store  Learn how to work with and maintain the Query Store  Discover new opportunities and mechanisms for dealing with query performance tuning issues 16
  • 17. Grant Fritchey | www.ScaryDBA.com Get in touch scarydba.com grant@scarydba.com @gfritchey Grant Fritchey
  • 18. Grant Fritchey | www.ScaryDBA.com Questions? 18
  • 19. Grant Fritchey | www.ScaryDBA.com Photo Credits  Meteor  London  Flight data recorder  Undo button 19