Always on availability groups way too deep

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Joseph D'Antoni

Deep Dive into AlwaysOn Availability Groups.

Technology

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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