Always on availability groups way too deep

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This document discusses AlwaysOn availability groups in SQL Server 2012. It provides an overview and agenda which includes enabling AlwaysOn, building an availability group, adding data to a primary database, backing up the transaction log on the secondary, and querying the secondary database. It notes that extended events can provide insights into what happens with AlwaysOn operations and demonstrates some of these events.

AlwaysOn Availability
Groups
Way Too Deep
Joey D’Antoni
SQL Saturday #164 Cleveland
18 August 2012

About Me

 Principal Architect SQL Server, Comcast Cable
 @jdanton
 Joedantoni.wordpress.com (Slides will be here and on SQL Sat site)
 jdanton1@yahoo.com

Agenda

 Overview of AlwaysOn
 Extended Events Briefly
 What Happens When?
 Turn on AlwaysOn
 We Build an Availability Group
 We add data to a Primary DB
 We backup the transaction log on the secondary
 We query the secondary DB

Warning

 You are going to see a few things that aren’t fully
documented
 We aren’t touching anything—just looking to see what’s
going on
 I’m telling you what I think is happening, I’m still trying to
get answers on some of it

Extended Events

 Eventual Replacement for SQL Profiler Tracing
 612 Events in SQL 2012
 A significant portion of these deal with AlwaysOn (HADR)

What Happens When…

 We enable AlwaysOn

Creating an Availability Group

 Object in AD and DNS Gets Created (Listener)
 Database(s) get restored onto secondary
 Lots of Metadata gets created to Manage the Availability
Group

Moving Data

 Database Mirroring used a single thread per database to move data
 Always On is different—it uses a request pool that is shared between all
AlwaysOn Databases
 On the primary messages the active log scanner is the log pole.
 When a secondary is ready to receive log blocks a message is sent to the
primary to start the log scanning.
 This message is handled by a worker in the HadrThreadPool.

Transaction Log Backup on Secondary

 One of the new features of 2012
 Allows us to flush the log on the primary database by backing up on the
secondary

Querying Secondary Instance

 Another Big Feature of AlwaysOn Replicas
 Runs in Snapshot Isolation Transaction Level to Minimize Blocking Issues
 Creates Secondary Stats where missing—in TempDB

Summary

 AlwaysOn is pretty cool
 It’s clear a lot of work went into this
 It’s fairly complicated, but the good news is that it’s easy to work on

Contact

 @jdanton
 jdanton1@yahoo.com
 Joedantoni.wordpress.com

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Always on availability groups way too deep

1. AlwaysOn Availability Groups Way Too Deep Joey D’Antoni SQL Saturday #164 Cleveland 18 August 2012

2. About Me  Principal Architect SQL Server, Comcast Cable  @jdanton  Joedantoni.wordpress.com (Slides will be here and on SQL Sat site)  jdanton1@yahoo.com

3. Agenda  Overview of AlwaysOn  Extended Events Briefly  What Happens When?  Turn on AlwaysOn  We Build an Availability Group  We add data to a Primary DB  We backup the transaction log on the secondary  We query the secondary DB

4. Warning  You are going to see a few things that aren’t fully documented  We aren’t touching anything—just looking to see what’s going on  I’m telling you what I think is happening, I’m still trying to get answers on some of it

5. Availability Groups

6. Extended Events  Eventual Replacement for SQL Profiler Tracing  612 Events in SQL 2012  A significant portion of these deal with AlwaysOn (HADR)

7. What Happens When…  We enable AlwaysOn

8. Enable AlwaysOn  Demo

9. HADR_WSFC_CHANGE_NOTIFIER_STATUS

10. Creating an Availability Group  Object in AD and DNS Gets Created (Listener)  Database(s) get restored onto secondary  Lots of Metadata gets created to Manage the Availability Group

11. Building Availability Groups  Demo

12. Moving Data  Database Mirroring used a single thread per database to move data  Always On is different—it uses a request pool that is shared between all AlwaysOn Databases  On the primary messages the active log scanner is the log pole.  When a secondary is ready to receive log blocks a message is sent to the primary to start the log scanning.  This message is handled by a worker in the HadrThreadPool.

13. Moving Data

14. Moving Data  Demo

15. Transaction Log Backup on Secondary  One of the new features of 2012  Allows us to flush the log on the primary database by backing up on the secondary

16. Secondary Log Backup  Demo

17. Querying Secondary Instance  Another Big Feature of AlwaysOn Replicas  Runs in Snapshot Isolation Transaction Level to Minimize Blocking Issues  Creates Secondary Stats where missing—in TempDB

18. Stats on Secondary

19. Stats on Secondaries  Demo

20. Summary  AlwaysOn is pretty cool  It’s clear a lot of work went into this  It’s fairly complicated, but the good news is that it’s easy to work on

21. Questions

22. Contact  @jdanton  jdanton1@yahoo.com  Joedantoni.wordpress.com

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