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5 Amazing Reasons DBAs Need to Love Extended Events
The document outlines five compelling reasons for database administrators (DBAs) to embrace Extended Events, a highly configurable tracing tool for SQL Server. It highlights data survivability, the ability to customize captured events and data, DMV integration for detailed analysis, and tracing methodologies for analyzing wait stats and latch issues. Overall, it advocates for the benefits of using Extended Events to empower DBAs in performance monitoring and troubleshooting.
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5 Amazing Reasons DBAs Need to Love Extended Events
- 1. 5 Amazing ReasonsDBAs Need to Love Extended Events
- 2. Jason Strate e: jstrate@pragmaticworks.com e: jasonstrate@gmail.com b:www.jasonstrate.com t: StrateSQL Resources jasonstrate.com/go/xevents Introduction MAKING BUSINESS INTELLIGENT www.pragmaticworks.com
- 3. MAKING BUSINESS INTELLIGENT www.pragmaticworks.com •Founded 2008 by MSFT MVP Brian Knight • Focused on the MSFT SQL Server Platform • Provides services, training and software • MSFT/HP “go to” partner: • Gold Certified: o BI o Data Management o SQL Performance • Team led by multiple MVP’s • Offices throughout the US with Corporate HQ in Jacksonville, FL Pragmatic Works Company History
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- 5. Extended Events Dynamic, highlyconfigurable tracing tool that provides access to events and related information from the event.
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- 9. 5 Amazing ReasonsDBAs Need to Love Extended Events
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- 11. MAKING BUSINESS INTELLIGENT www.pragmaticworks.com DataSurvivability Scenario • Weekend performance issues expected • Configure SQL Trace to capture statistics • You enjoy your weekend • Sysadmin/junior DBA restarts instance on Friday night • Monday morning… GO!
- 12. MAKING BUSINESS INTELLIGENT www.pragmaticworks.com DataSurvivability Scenario • Performance issue shows up • Start Profiler to collect some events • Initial analysis deems – New events are needed – New columns are needed • Collected data is still important • Change the trace… GO!
- 13. MAKING BUSINESS INTELLIGENT www.pragmaticworks.com DataSurvivability • Solution exists with SQL Trace/Profiler – Configure startup stored procedures – Save off data • Extended events – Keep the session, restart on SQL Server startup – Add events and columns on the fly – Existing target unaffected
- 14. MAKING BUSINESS INTELLIGENT www.pragmaticworks.com DATASURVIVABILITY Demo
- 15. MAKING BUSINESS INTELLIGENT www.pragmaticworks.com KeyPoints on Data Survivability • Extended events are highly configurable • Active sessions – Events can be added/removed – Columns can be added/removed • Sessions – Retained on startup – Can automatically restart
- 16. Get What YouWant
- 17. MAKING BUSINESS INTELLIGENT www.pragmaticworks.com GetWhat You Want Mo’ Problems • Performance issue shows up • Start Profiler to collect some events • Initial analysis deems – New events are needed – New columns are needed • Collected data is still important • Change the trace… GO!
- 18. MAKING BUSINESS INTELLIGENT www.pragmaticworks.com GetWhat You Want Mo’ Problems • Textdata returns parameterized T-SQL • Do you need BigintData1 and BigintData2? • Aggregate data for trends
- 19. MAKING BUSINESS INTELLIGENT www.pragmaticworks.com GetWhat You Want Mo’ Solutions • Actions – Plan_handle – Query_handle – Query_hash – TSQL_stack – Is_system • Targets – Histogram/Bucketizer – Event_coutner – Event_stream
- 20. MAKING BUSINESS INTELLIGENT www.pragmaticworks.com GETWHAT YOU WANT Demo
- 21. MAKING BUSINESS INTELLIGENT www.pragmaticworks.com KeyPoints on Get What You Want • Extended events are highly configurable – STILL!! • Actions – Add in the columns that you need – Create actionable traces • Targets – More options that are useful
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- 23. MAKING BUSINESS INTELLIGENT www.pragmaticworks.com DMVIntegration DMV Information • Summary information • Deeper information DMV Columns • Plan_handle • Query_handle • Query_hash • TSQL_stack
- 24. MAKING BUSINESS INTELLIGENT www.pragmaticworks.com DMVINTEGRATION Demo
- 25. MAKING BUSINESS INTELLIGENT www.pragmaticworks.com KeyPoints on DMV Integration • DMVs allow expansion of trace results – More detail – Link other items together • Build the complete picture – Analyze all at once • No intermediate levels of aggregation
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- 27. MAKING BUSINESS INTELLIGENT www.pragmaticworks.com Waits& Queues Methodology
- 28. MAKING BUSINESS INTELLIGENT www.pragmaticworks.com WaitStat Tracing DMVs • Sys.dm_os_wait_stats • Sys.dm_os_waiting_tasks Problem • High level • Aggregate • Point in time
- 29. MAKING BUSINESS INTELLIGENT www.pragmaticworks.com WaitStat Tracing Scenario • Instance has been online for months. • Code change deployed recently • CPU spiked from 40% to 100% • High SOS_SCHEDULER_YIELD waits and counts – Death by a million cuts • High CPU items in DMVs are overnight maintenance jobs
- 30. MAKING BUSINESS INTELLIGENT www.pragmaticworks.com WAITSTAT TRACING Demo
- 31. MAKING BUSINESS INTELLIGENT www.pragmaticworks.com KeyPoints on Wait Stat Tracing • Waits & Queues is a popular methodology – Difficult to track waits to statement • DBAs empowered in Waits & Queues – Truly perform root cause analysis • Specific waits can be traced and captured – Instance – Database – Application – User
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- 33. MAKING BUSINESS INTELLIGENT www.pragmaticworks.com LatchTracing Latch: Lightweight synchronization activity. Examples: • Page allocations • Disk-to-memory transfers • In-memory transfers DMV • Sys.dm_os_latch_stats
- 34. MAKING BUSINESS INTELLIGENT www.pragmaticworks.com LatchTracing Scenario • New application deployed • High volume of users • High number of LATCH_EX waits – Non-buffer latching – Exclusive • Other applications appear to be affected • Application is much slower than in test • Where’s the problem… GO!
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- 36. MAKING BUSINESS INTELLIGENT www.pragmaticworks.com KeyPoints on Latch Tracing • Latch issues can be hard to troubleshoot • Typically happening out of sight • Latches can be traced and captured – Instance – Database – Application – User
- 37. 5 Amazing ReasonsDBAs Need to Love Extended Events
- 38. Loving Extended Events DataSurvivability Get What You Want DMV Integration Wait Stat Tracing Latch Tracing
- 40. Learn More AboutExtended Events MAKING BUSINESS INTELLIGENT www.pragmaticworks.com
- 41. Services Speed development throughtraining, and rapid development services from Pragmatic Works. Products BI products to covert to a Microsoft BI platform and simplify development on the platform. Foundation Helping those who do not have the means to get into information technology achieve their dreams. For more information… Name: Jason Strate Email: jstrate@pragmaticworks.com Blog: www.jasonstrate.com Resource: jasonstrate.com/go/xevents