Odessa .net-user-group-sql-server-2019-hidden-gems by Denis Reznik
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This document discusses hidden gems in SQL Server 2019, including lightweight query profiling, DBCC PAGE, dm_os_host_info, dm_os_schedulers, and QUERY OPTIMIZER COMPATIBILITY LEVEL. It provides demos of these lesser known features and notes that the string truncation error message is one of the most well-known hidden features. The author concludes that more hidden features will continue to be added to SQL Server.
Odessa .net-user-group-sql-server-2019-hidden-gems by Denis Reznik
- 1. Hidden Gems of SQL Server 2019 Odessa .Net User Group Denis Reznik Data Architect at Intapp, Inc. Microsoft Data Platform MVP
- 2. About Me • Denis Reznik • Kyiv, Ukraine • Data Architect at Intapp, Inc. • Microsoft Data Platform MVP • Co-Founder of Ukrainian Data Community Kyiv (PASS Chapter) • PASS Regional Mentor, Central and Eastern Europe • Co-author of “SQL Server MVP Deep Dives vol. 2”
- 3. SQL Server 2019 • Killer Features • Big Data Clusters • Secure Enclaves • Intelligent QP • Java Support • String Truncation Error Message (the most known “hidden” feature) • Hidden Features • Lightweight Query Profiling • DBCC PAGE • dm_os_host_info • dm_os_schedulers • QUERY OPTIMIZER COMPATIBILITY LEVEL
- 5. Session Level Lightweight Profiling • SQL Server 2014 – sys.dm_exec_query_profiles • SQL Server 2016/2014 SP1 – Live Query Statistics • Enable LQS in SSMS • SET STATISTICS XML ON • SET STATISTICS PROFILE ON • query_post_execution_showplan event • SQL Server 2016/2014 SP2 - query_thread_profile event • SQL Server 2016 SP1 – query_thread_profile/TF 7412 • Lightweight query execution profiling • https://blogs.msdn.microsoft.com/sql_server_team/query-progress-anytime-anywhere/ Server Level
- 8. Global Allocation MAP (GAM) GAM Extent 1 Query 1 Query 2 LATCH Wait Extent 2 GAM 2 GAM 3 … …4GB 4GB
- 10. dm_os_schedulers
- 11. Query Execution Thread Pool Running Suspended Runnable Scheduler Logical CPU Worker (Thread) Connection
- 13. QUERY OPTIMIZER COMPATIBILITY LEVEL
- 14. Statistics 500 1000 10 1200 800 1 800 2000 2800 4500 5400 SELECT * FROM Users WHERE Id BETWEEN 2100 AND 2500 SELECT * FROM Users WHERE Id BETWEEN 200 AND 5000
- 15. 500 1000 10 1200 800 1 800 2000 2800 4500 5400 Statistics SELECT * FROM Users u INNER JOIN Posts p ON u.Id = p.OwnerUserId WHERE u.DisplayName LIKE 'Jeff%' 10600 20000 10 1200 800 A G L S T ZZZZ Users Posts
- 16. DEMO QUERY OPTIMIZER COMPATIBILITY LEVEL
- 17. SUMMARY • Truncation Error Message (the most known “hidden” feature) • Lightweight Query Profiling • DBCC PAGE • dm_os_host_info • dm_os_schedulers • QUERY OPTIMIZER COMPATIBILITY LEVEL • More hidden features are coming..
- 18. Thank You! Denis Reznik Twitter: @denisreznik Email: [email protected] Blog: http://reznik.uneta.com.ua Facebook: https://www.facebook.com/denis.reznik.5 LinkedIn: http://ua.linkedin.com/pub/denis-reznik/3/502/234