1. Extend Your Knowledge with Extended Events!
Janis Griffin
Senior DBA

2. Who Am I Senior DBA for Confio Software Current – 24+ Years DBA
@DoBoutAnything
Current – 24+ Years DBA
Primarily SQL Server, Sybase, Oracle
Former – Database Design & Implementation
Specialize in Performance Tuning
Review Database Performance for Customers and Prospects
Common Thread – How do I tune it?

3. Agenda Extended Events Introduction Terms & Useful DMVs
How to Create in 2012
Viewing & Reporting Event Info
Examples
Deadlock Monitoring
Query Performance
Aggregate Like SQLs

4. Extended Events Intro (EE)
Lightweight event-handling mechanism
Captures event information like SQL Profiler / SQL Trace
More information plus you can now configure
When events are triggered
they can be sent to a target for further analysis
Introduced in SQL Server 2008
Very complex to code and read (parse xml)
Much Improved in 2012 with many more Events
SSMS has Extended Event Interface
Deprecation Announcement
SQL Trace No More
won’t be in Versions > 2012
select instance_name, cntr_value
from sys.dm_os_performance_counters
where object_name like '%deprecate%'
and instance_name like '%trace%'

5. Extended Events Intro (EE)
DDL statements that create / modify Extended Events sessions
CREATE EVENT SESSION
Creates an extended event session object
Identifies Source of the events, Targets, and Parameters
ALTER EVENT SESSION
Starts/stops an event session or changes an event session configuration
DROP EVENT SESSION
Drops an event session
DMVs / Catalog views show session data & metadata
Use TSQL statements to get information on every extended events session that is created

6. Catalog Views for EE Metadata Views for event session creation
sys.server_event_sessions
Lists all event session definitions
sys.server_event_session_events
Returns a row for each event in an event session
sys.server_event_session_actions
Returns a row for each action on each event of an event session
sys.server_event_session_fields
Returns a row for each customizable column explicitly set on events and targets
sys.server_event_session_targets
Returns a row for each event target for an event session

7. DMVs for EE Session data created when event session is started
Note:  Views don’t have session data until a session starts
sys.dm_os_dispatcher_pools - Returns information about session dispatcher pools
sys.dm_xe_objects - Returns a row for each object exposed by an event package
sys.dm_xe_object_columns - Returns the schema information for all the objects
sys.dm_xe_packages - Lists all the packages registered with extended events engine
sys.dm_xe_sessions - Returns information about an active extended events session
sys.dm_xe_session_targets - Returns information about session targets
sys.dm_xe_session_events - Returns information about session events
sys.dm_xe_session_event_actions - Returns information about event session actions
sys.dm_xe_session_object_columns - Shows the configuration values for objects bound to a session
sys.dm_xe_map_values - Provides a mapping of internal keys to human-readable text

8. DMVs for EE Objects
SELECT p.name AS package_name, o.name AS event_name, o.description FROM sys.dm_xe_packages AS p JOIN sys.dm_xe_objects AS o ON p.guid = o.package_guid WHERE (p.capabilities IS NULL OR p.capabilities & 1 = 0) AND (o.capabilities IS NULL OR o.capabilities & 1 = 0) AND o.object_type = 'event' ORDER by o.name

9. DMVs for EE Targets
SELECT p.name AS package_name, o.name AS target_name, o.description FROM sys.dm_xe_packages AS p JOIN sys.dm_xe_objects AS o ON p.guid = o.package_guid WHERE (p.capabilities IS NULL OR p.capabilities & 1 = 0) AND (o.capabilities IS NULL OR o.capabilities & 1 = 0) AND o.object_type = ‘target' ORDER by o.name

10. DMVs for EE Actions
SELECT p.name AS package_name, o.name AS action_name, o.description FROM sys.dm_xe_packages AS p JOIN sys.dm_xe_objects AS o ON p.guid = o.package_guid WHERE (p.capabilities IS NULL OR p.capabilities & 1 = 0) AND (o.capabilities IS NULL OR o.capabilities & 1 = 0) AND o.object_type = ‘action' ORDER by o.name

11. Session Creation Example
CREATE EVENT SESSION [Deadlocks] ON SERVER ADD EVENT sqlserver.xml_deadlock_report (ACTION(sqlserver.client_connection_id,sqlserver.database_name,sqlserver.query_hash,sqlserver.session_id,sqlserver.sql_text,sqlserver.tsql_stack)) ADD TARGET package0.event_file(SET filename=N'c:\Program Files\Microsoft SQL Server\MSSQL11.SPEEDTY\MSSQL\Log\Deadlocks_xml.xel'), ADD TARGET package0.histogram(SET filtering_event_name=N'sqlserver.xml_deadlock_report',source=N'xml_report',source_type=(0)), ADD TARGET package0.ring_buffer WITH (MAX_MEMORY=4096 KB,EVENT_RETENTION_MODE=ALLOW_SINGLE_EVENT_LOSS,MAX_DISPATCH_LATENCY=30 SECONDS,MAX_EVENT_SIZE=0 KB,MEMORY_PARTITION_MODE=NONE,TRACK_CAUSALITY=ON,STARTUP_STATE=OFF) GO

12. Session Creation Example
2012 Script used in 2008
CREATE EVENT SESSION [Deadlocks] ON SERVER
ADD EVENT sqlserver.xml_deadlock_report
(ACTION(sqlserver.session_id,sqlserver.sql_text,sqlserver.tsql_stack))
ADD TARGET package0.ring_buffer WITH (MAX_MEMORY=4096 KB, EVENT_RETENTION_MODE=ALLOW_SINGLE_EVENT_LOSS,
MAX_DISPATCH_LATENCY=30 SECONDS,MAX_EVENT_SIZE=0 KB, MEMORY_PARTITION_MODE=NONE,TRACK_CAUSALITY=ON,
STARTUP_STATE=OFF) GO

13. 2012 Extended Events

14. 2012 Extended Events

15. Creating Deadlock EE

16. Deadlock Event

17. Deadlock EE Actions

18. Deadlock EE Filters

19. Deadlock EE Target

20. Managing/ Viewing Sessions

21. Viewing Targets

22. Viewing Targets

23. Demonstration Examples Deadlock Monitoring Query Performance
Aggregate Like SQLs

24. Demo Steps Deadlocking Walk through the Session properties
General
Events, Actions, Filters
Targets
Start Monitor
Run dlock1 / dlock2 to get deadlock
Show different target examples

25. Demo Steps Query Performance Show How To Script Start Monitor
Run load – AdventureWorks
Show Extended Event Options (Menu)
Save Viewing properties for reuse
File / Open
Group Session / Sum Duration / View Waits

26. Demo Steps Aggregate Like SQLs Group By Query Plan Hash
Sum by Duration
Sort Descending
Select * from

27. Summary Extended Events are light weight
Quickly / continuously gather Performance Data
Easy to capture, store and view data
Via Sessions, Events, Actions, Filters, & Targets
Can be used to troubleshoot issues
Replaces Sql Server Profile for Trace Capture
Deprecated in next release
Still need to use for Trace Capture of Analysis Services
Replaces Sql Trace
Stored procedures, functions and catalog views

28. About Confio Wait-Based Performance Tools Ignite8 / IgniteVM
Ignite for SQL Server, Oracle, DB2, Sybase
Helps show which SQL to tune
Based in Colorado, worldwide customers
Free trial at
– Free Current View