1. Extended Events: Successful troubleshooting recipes
Dennes Torres
Extended Events: Successful troubleshooting recipes

2. Speaker Bio Senior Software Developer Trainer
Ascent Software
Trainer
MCT, MCSE Data Platform, MCSE BI, MCSD Web Development
Malta Data Platform UG Leader
Malta
MMDPUG
Dennes.Torres
@Dennes

3. Our generous sponsors

4. Why move to Extended Events
On This Session
Why move to Extended Events
Motivation to move to Extended Events
Troubleshooting recipes

5. Agenda Introduction Blocked Process Report Sort Spills Deadlocks
Log Flushes
Improving the use of the recipes
Much More

6. Introduction

7. It was Deprecated in SQL Server 2014
Profiler Deprecated
It was Deprecated in SQL Server 2014
There is no date to be removed
It should be replaced by Extended Events

8. SQL Trace is the server side
SQL Profiler
It’s only a client tool
SQL Trace is the server side
SQL Trace is also deprecated

9. Performance

10. Reading Extended Events Data
Watch live data
Export to Table
XML Queries
Automated XML Queries
Real time response

11. Blocked Pocess

12. Blocked Process Problem Identify the Problem Solve the Problem
Identify the source of blocking problems in a slow environment
Identify the Problem
Configure Blocked Process Threshold on server level
Never configure for less then 5 seconds
Capture information about the blocked process
Solve the Problem
Adjust transactions and lock hints to avoid blocking

13. Recipe Directions Event Filter Query Blocked_process_report None
Usual XML sauce

14. The configuration needs to be always over 5 seconds
How to Serve
The configuration needs to be always over 5 seconds
If you find too many repetitions, increase the configuration value

15. Demo Scripts BlockedProcess and BlockedProcess2

16. Sort Spills

17. Sort Spills in TempDB Problem Identifying the Problem
Outdated statistics can make a SORT operation spill data to tempdb
Identifying the Problem
Finding the query causing the sort spill you find the outdated statistic
Solving the Problem
Update the outdated statistics

18. Recipe Directions Event Actions Query
Use the event sqlserver.sort_warning
Actions
Sql_text and database_id are essential
Query
Usual XML sauce
Translate the database_id

19. How to Serve
Serve at will, no side effects

20. Demo Sort.sql

21. Deadlocks

22. Deadlocks Problem Identify the Problem Solve the Problem
Application problems can cause deadlocks in transactions
Identify the Problem
We need to identify the transactions involved in the deadlock
Solve the Problem
Usually the solution involves changing the application

23. Recipe Directions Event Filter Query
Use the event xml_deadlock_report
Filter
No filter
Query
The result is a XML inside the usual XE XML

24. How to Serve
Serve at will, no side effects

25. Demo Deadlocks Deadlocks1 Deadlocks2

26. Log Flushes

27. Log Flushes Problem Identify the Problem Solve the Problem
High amounts of log flushes in batch processes impacts performance
Identify the Problem
Identify the total of log fluhes and compare with other versions of the process
Solve the Problem
Improve the batch process

28. Recipe Directions Evento Filter Query Use the event log_flush_start
Use the histogram output
Use output to file to check the size of the log flush
Filter
You should filter by database
Query
Special XML sauce for histogram
Usual XML sauce to check log flush size

29. How to Serve
Use this recipe to identify the amount of log flushes while analyzing the performance of a batch and identify possible improvements

30. Demo LogFlush LogFlushData

31. Improving the Recipes

32. Making it easier Create a database for admin objects
Create a function for each query over the sessions
The functions should be parameterized
Use the functions instead of the big queries

33. Demo CreatingFunctions UsingFunctions

34. Much More

35. Much More Memory_Grant_Updated_By_Feedback Adaptive_join_skiped
Interleaved_Execution_failed
Page_Split

36. Even More
System_Health XE session

37. Speaker Bio Senior Software Developer Trainer
Ascent Software
Trainer
MCT, MCSE Data Platform, MCSE BI, MCSD Web Development
Malta Data Platform UG Leader
Malta
MMDPUG
Dennes.Torres
@Dennes