1. Are You High? Can You Recover? Robert Douglas SQL Saturday #468, Sydney 27 th February 2016

2. Mobile Phones please set to “stun” during sessions Evaluations complete online to be in the draw for fantastic prizes Wifi Details Login: Password: SESSIONSEVENT http://www.sqlsaturday.com/468/ sessions/sessionevaluation.aspx http://www.sqlsaturday.com/468/ eventeval.aspx Housekeeping Are you High? Can you Recover?

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4. 4 | Who Am I? Robert Douglas BA(hons),MCTS, MCITP(2005/2008), MCSA(2012) Consultant for SQL Services Limited Christchurch\Nelson SQL Server Users Group Likes people giving him money Are you High? Can you Recover?

5. The Christchurch Earthquakes 5 | Citywide destruction. Power loss nearly everywhere. Internet and cell networks down Physical Access to servers restricted or denied. Loss of Life Loss of jobs, buildings and business. Limited preparation for the scale of disaster. Are you High? Can you Recover?

6. 6 | High Availability\Disaster Recovery  Recovery Time Objective(RTO)  Recovery Point Objective(RPO)  What Disaster? (Documentation) Are you High? Can you Recover?

7. 7 | What Are The Options? Are you High? Can you Recover? Not talking about:  SAN Replication  VM level  Cloud  3 rd Party Products Native SQL solutions:  Clustering  Synchronous Mirroring  Replication  Asynchronous Mirroring  Availability Groups  Log Shipping

8. 8 | High Availability Are you High? Can you Recover? Native SQL solutions:  Clustering*  Synchronous Mirroring*  Replication*  Asynchronous Mirroring  Availability Groups*  Log Shipping

9. 9 | Disaster Recovery Are you High? Can you Recover? Native SQL solutions:  Clustering  Synchronous Mirroring  Replication*  Asynchronous Mirroring*  Availability Groups*  Log Shipping*

10. 10 |Are you High? Can you Recover? Backups  Take regular backups  Test your backups  Is this HA\DR?  What to backup?

11. 11 |Are you High? Can you Recover? Log Shipping  Log Shipping is the automating of a backup restore process.  Can log ship to multiple targets.  Including the same server the original database is on.  Can restore a database to a readable state.  No Automated Failover.

12. 12 |Are you High? Can you Recover? Clustering 2(or more) sets of hardware Single set of disks Standard Edition allows for an Active-Passive Cluster

13.  Redo every insert,update and delete on another server.  High Safety – Synchronous  High Performance – Asynchronous  Synchronous allows for automated failover(requires witness)  Increases Availability.  Only failover one db at a time. No automatic failover.  Asynchronous requires Enterprise licensing. Reporting – You can create a snapshot of the mirror database and report off that. Mirroring Are you High? Can you Recover?

14. Always On Availability Groups  Mirroring on steroids(with some clustering thrown in).  Requires Windows Cluster  Multiple Replicas  2012 – 4 Secondaries.  2014 – 8 Secondaries  Replicas can be readable. Are you High? Can you Recover?

15. Replication  Can be both HA or DR, or both, or neither.  Highly customizable  Schema compatibility(change table on one location – boom)  More of a business case thing. Why do you need it.  Only HA\DR which allows different indexing options. Are you High? Can you Recover?

16. So Which HA\DR Strategy is Best?  It depends.  Choose or combine the strategy that is right for you and your environment.  Scope your requirements  Implement an appropriate solution  Document the solution  Test it works Are you High? Can you Recover?

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