SQL Server Tools for Query Tuning
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This document discusses various SQL Server tools for query tuning. It begins by outlining the goals of understanding available native tools, applying the right tools for situations, and learning how to use the tools. The document then covers tools for identifying issues, investigating queries, modifying queries, and measuring performance. These include extended events, Query Store, dynamic management views, execution plans, and automation features. It provides examples of how each tool can be used and concludes with documentation resources.
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如果您处于以下几种情况：
◇在校期间，因各种原因未能顺利毕业……拿不到官方毕业证
◇面对父母的压力，希望尽快拿到；
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◇回国时间很长，忘记办理；
◇回国马上就要找工作，办给用人单位看；
◇企事业单位必须要求办理的
◇需要报考公务员、购买免税车、落转户口
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SQL Server Tools for Query Tuning
- 1. SQL SERVER TOOLS FOR QUERY TUNING Grant Fritchey | Redgate Software
- 2. GOALS • Understand the native tools available to aid in query tuning. • Know how to apply which tools in a given situation in order to better aid query tuning. • Learn how to use various tools in aid of performance tuning.
- 5. IDENTIFY Extended Events Query Store Dynamic Management Views
- 8. MEASURE Extended Events Query Store Dynamic Management Views SSMS Tooling
- 9. AUTOMATE Azure SQL Database SQL Server 2017 Query Store
- 11. WHICH SQL SERVER? SQL Server 2012+ Azure SQL Database Azure SQL Data Warehouse SQL Server 2017
- 12. The Tools • Extended Events • Query Store • Dynamic Management Views • SSMS • Execution Plans • Automation
- 13. EXTENDED EVENTS
- 14. EXTENDED EVENTS Lightweight Low cost Superior filtering On the server Causality tracking
- 15. EXTENDED EVENTS Package Events Actions Targets Types Predicates Maps
- 16. EXTENDED EVENTS Session Targets Events Actions
- 17. EXTENDED EVENTS Used in Identify Measure
- 18. DEMO
- 19. QUERY STORE
- 21. QUERY STORE DATA: PLAN STORE VIEWS 21 sys.query_store_query query_id query_text_id query_hash object_id last_compile_start_time last_execution time avg_compile_duration count_compiles …and more sys.query_store_query_text query_text_id query_sql_text statement_sql_handle …and more sys.query_store_plan plan_id query_id engine_version compatibility_level query_plan_hash query_plan is_trivial_plan is_natively_compiled …and more
- 22. QUERY STORE DATA: RUNTIME VIEWS 22 sys.query_store_runtime_stats plan_id runtime_stats_interval_id count_executions avg_duration stdev_duration last_cpu_time min_cpu_time max_rowcount avg_dop avg_logical_io_reads avg_physical_io_reads …and more sys.query_store_runtime_stats_interval runtime_stats_interval_id start_time end_time comment sys.query_store_wait_stats plan_id runtime_stats_interval_id wait_category_desc avg_query_wait_time_ms std_dev_query_wait_time_ms
- 23. YOU CONTROL… 23 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
- 25. PLAN FORCING 25 Plan Store Runtime Statistics Query Optimization Process Async Query Execution Async Plan forcing
- 26. DEMOS 26
- 27. QUERY TUNING OPPORTUNITIES 27 Changes in how you monitor New information available Bad parameter sniffing Cardinality estimation issues Structural problems leading to plan differences
- 28. UPGRADE OPPORTUNITIES 28 Restore your older database, leave compatibility level in place Turn on query store Run your load Switch compatibility level Identify regressions & force plans as needed
- 29. QUERY STORE Used in Identify Measure Automate
- 31. DYNAMIC MANAGEMENT VIEWS (DMV) T-SQL Cache dependent Limited runtime info Ubiquitous
- 32. DYNAMIC MANAGEMENT VIEWS Transaction Related Sys.dm_tran_locks Sys.dm_tran_active_transactions Sys.dm_tran_database_transactions
- 33. DYNAMIC MANAGEMENT VIEWS Index Related sys.dm_db_index_physical_stats sys.dm_db_index_usage_stats sys.dm_db_missing_index_*
- 34. DYNAMIC MANAGEMENT VIEWS Execution Related Live sys.dm_exec_requests Sys.dm_exec_session_wait_stats Sys.dm_exec_sessions Cache Sys.dm_exec_query_stats Sys.dm_exec_procedure_stats Cross-over Sys.dm_exec_query_plan Sys.dm_exec_sql_text Sys.dm_exec_text_query_plan
- 35. DEMO
- 36. STRICTLY SPEAKING, CHEATING • Whoisactive.com
- 37. DYNAMIC MANAGEMENT VIEWS Used in Identify Measure
- 38. SSMS TOOLS
- 39. SSMS TOOLS Stuff we are not talking about Data Collection Database Engine Tuning Advisor 3rd Party Profiler
- 40. SSMS TOOLS Stuff we could talk about but won’t Statistics Database Objects 3rd Party Fragmentation
- 41. SSMS TOOLS Include Client Statistics Positives History Comparisons Consistent across edits Negatives Inaccurate Inconsistent with other data Difficult to capture
- 42. SSMS TOOLS SET STATISTICS TIME Positives Easy Immediate Persistent Flexible Negatives Creates load Inconsistent with other data
- 43. SSMS TOOLS SET STATISTICS IO Positives Easy Immediate Persistent Flexible Negatives Creates HUGE load Inconsistent with other data
- 44. SSMS TOOLS Database Scoped Configuration Positives Granular Specialized Persistent Negatives Hidden Inconsistent behavior
- 45. SSMS TOOLS Used in Identify Investigate Measure Modify
- 46. DEMO
- 47. EXECUTION PLANS
- 48. WHAT IS AN EXECUTION PLAN • An execution plan describes the set of operations that the execution engine within SQL Server needs to perform in order to return the data or perform the action required by a query.
- 49. WHAT IS IN A PLAN
- 50. WHAT IS IN A PLAN
- 51. WHAT IS IN A PLAN
- 52. WHAT IS IN A PLAN
- 53. EXECUTION PLANS Estimated Actual Estimated Plan with metrics
- 54. PLAN METRICS Degree of Parallelism Memory Grant Wait Statistics Query Time Statistics Memory Grant Info Parameter Runtime Value
- 55. OPERATOR METRICS Counts Per Thread Actual Rebinds Actual Rewinds Actual Rows Batches Actual CPU MS Actual End of Scans Actual Executions Actual Logical Reads Actual Physical Reads Actual Read Aheads Actual Elapsed DMS Actual Lob Logical Reads Actual Lob Physical Reads Actual Lob Read Aheads Input Memory Grant Output Memory Grant Used Memory Grant
- 56. WHAT TO LOOK FOR
- 57. First Operator Warnings Most Costly Operations Fat Pipes Extra Operators Scans Estimated vs. Actual
- 58. FIRST OPERATOR Plan size Compile time Missing Indexes Optimization level Parameter • Compiled value • Runtime Value Query hash Reason for early termination ANSI settings
- 59. WHERE TO GO, WHAT TO READ It’s all in the Properties Identify Node ID Combine plans and metrics Every operator is unique (to a degree) Track output from each operator
- 60. LIVE QUERY STATISTICS Living Query Plan 2014+ Data only in 2012 Must activate with query Can’t run on executing query No recording
- 61. COMPARING EXECUTION PLANS SSMS 17.4+ 2016+ Hilight differences One plan must be file Identify similarities Includes properties
- 62. EXECUTION PLANS Used in Investigate Modify
- 63. AUTOMATION
- 64. ADAPTIVE QUERY PROCESSING Multi-Statement Table- Valued Functions Interleaved execution No data modification No CROSS APPLY Marked in execution plan Tracking through extended events Batch Mode Memory Grants Literally revises memory grant Batch Mode processing only 2x or greater on memory over 1mb No RECOMPILE Tracking through extended events Batch Mode Adaptive Joins Defers join choice Batch Mode processing only Hash or loop joins only Tracking through Query Store
- 65. AUTOMATED TUNING Weaponizing Query Store Machine learning Azure SQL Database only Index creation Drop Indexes
- 66. AUTOMATED PLAN REGRESSION Further weaponization of Query Store 2017 Only (not Azure!) sys.dm_db _tuning_ recommendations Last good plan Self correcting
- 67. WRAP-UP
- 69. DOCUMENTATION • Introducing SQL Server Extended Events • Plan Regressions in SQL Server 2017 • https://docs.microsoft.com/en-us/sql/relational- databases/automatic-tuning/automatic-tuning • https://docs.microsoft.com/en-us/azure/sql-database/sql- database-automatic-tuning
- 70. GOALS • Understand the native tools available to aid in query tuning. • Know how to apply which tools in a given situation in order to better aid query tuning. • Learn how to use various tools in aid of performance tuning.