Extended Events 101 : Japan SQL Server User Group
- 1. Japan SQL Server User Group Kenichiro Nakamura Oct/20 2018 Extended Events 101
- 2. SQL Server Extended Events Extended Events Extended Events is a light weight performance monitoring system that uses very few performance resources. It builds on existing concepts, such as an event or an event consumer, uses concepts from Event Tracing for Windows, and introduces new concepts.
- 3. • Capture queries • Capture system eventCollect • Save results to persist target • Save results to temporary targetStore • Grouping, ordering, aggregating resultAnalyze • Configurations • ExecutionsManage • GUI tools • T-SQL supportTools What’s Extended Events SQL Server Extended Events Packages
- 4. XEvent vs SQL Profiler Extended Events XEvent since SQL Server 2008 No UI in 2008 UI in 2012 and keep adding features SQL Profiler since SQL Server 7.0 Deprecated in SQL Server 2012 No more features SQL Server Profiler
- 5. XEvent vs SQL Profiler Extended Events XEvent SELECT * FROM sys.dm_xe_objects where object_type = 'event' SQL Profiler SELECT * FROM sys.trace_events SQL Server Profiler
- 7. Engine, Sessions, Packages Extended Events Components
- 8. Extended Event Engine Extended Events Engine
- 9. Extended Events Sessions Extended Events Sessions
- 10. Extended Events Sessions Extended Events Sessions Components Event/Target/Predicate/Actions State Start/Stop (on boot) Causality tracking Relate events Memory Retention mode, partition mode (3) Dispatch latency (30)
- 11. Extended Events Packages Extended Events Packages
- 12. • monitoring points of interest in the execution path of a program • can be used solely for tracing purposes or for triggering actionsEvent • consumers that receive dataTargets • programmatic response or series of responses to an event • invoked synchronously on the thread that fired the eventActions • Describe package object types such as event, action, etcTypes • set of logical rules that are used to evaluate events • selectively capture event data based on specific criteriaPredicates • maps an internal value to a string, which enables a user to know what the value representsMaps Extended Events Packages SQL Server Extended Events Packages
- 13. New Session Demo
- 15. Channel Grouping of category Category Grouping of event Event Event name Payload Default and additional Event Events
- 16. Target Targets Target = Event Consumer Basic Raw data Aggregate Aggregated Data
- 17. Target Targets Target Timing Synchronous Asynchronous Dispatching when: Memory Full Dispatch Latency (30)
- 18. Target Targets Event File (Raw, Async, On-Disk) Event Counter (Aggregate, Async, In-Memory) Histogram(Aggregate by bucket, Async, In-Memory) ETW (Raw, Sync, On-Disk) Event Paring (Aggregate, Async, In-Memory) Ring Buffer (Raw, Async, In-Memory) select * from sys.dm_xe_session_targets
- 19. Action Events Additional Data (Global Fields) • Capture a stack dump and inspect data. • Store state information in a local context using variable storage. • Aggregate event data. • Append data to event data. • Some typical and well known examples of actions are: • Stack dumper • Execution plan detection ( SQL Server only) • Transact-SQL stack collection ( SQL Server only) • Run time statistics calculation • Gather user input on exception
- 20. Predicates Events Predicates = Filter Different filter for each event Short Circuit i.e.) greater_than_max_int64
- 22. Object Explorer in SSMS Extended Events Tool
- 23. Create an Extended Events Session Using the New Session Dialog Create Extended Events Session New Session Wizard Easy to create session Expose “most” settings New Session Granular control Expose “all” settings Create an Extended Events Session Using the Wizard
- 24. Create Extended Events Template
- 25. Manage Extended Events Sessions Start Session Stop Session Watch Live Data Export Session Script Session Delete Session
- 26. Modify the Trace Results View Modify the Trace Results View Add/Remove Columns Create/Edit/Delete Merged Columns Sort Group Aggregate Filter Search
- 27. Modify the Trace Results View Demo
- 28. © Copyright Kenichiro Nakamura. All rights reserved.
Editor's Notes
- #7: Use wizard to capture sql_statement_completed and batch_sql_completed
- #8: Use wizard to capture sql_statement_completed and batch_sql_completed
- #14: Use wizard to capture sql_statement_completed and batch_sql_completed
- #15: Use wizard to capture sql_statement_completed and batch_sql_completed
- #22: Use wizard to capture sql_statement_completed and batch_sql_completed
- #23: Use wizard to capture sql_statement_completed and batch_sql_completed
- #28: Use wizard to capture sql_statement_completed and batch_sql_completed