Fundamentals of SQL Server 2012 Availability groups
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SQL Server 2012 Availability Groups are not a new technology, but build upon existing solutions like Failover Clustering and Database Mirroring. Availability Groups involve distributing copies of a database across multiple SQL Server instances and ensuring the copies are kept in sync. They provide an always-on solution that protects databases and enables failover to maintain availability even in the event of outages or hardware failures. Setting up Availability Groups requires configuring nodes, resources, groups, and quorum to enable automatic failover of databases between instances in a cluster.
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Fundamentals of SQL Server 2012 Availability groups
- 4. +
- 6. there’s just ONE problem
- 9. everyone has a right to SIMPLICITY
- 10. SQL Server 2012 Availability Groups
- 11. SQL Server 2012 Availability Groups
- 12. complex
- 13. I can’t blame them I felt the same way
- 14. I have to be intimidated
- 15. I have to be intimidated I actually know a few things
- 16. the complex is to start with what we already know the SECRET to understanding
- 17. SQL Server 2012 Availability Groups is NOT a new technology
- 18. SQL Server 2012 Availability Groups Failover Clustering Database Mirroring +
- 19. database mirroringhow it works
- 20. MirrorPrincipal WitnessApplication SQL Server SQL Server 2 2 4 51 3>2 >3 Mirror is always redoing – it remains current Commit log data log data database mirroringhow it works *database snapshot SYNCHRONOUS
- 21. MirrorPrincipal Application SQL Server SQL Server 2 2 4 51 3>2 >3 Mirror is always redoing – it remains current Commit log data log data database mirroringhow it works *database snapshot ASYNCHRONOUS
- 23. can either be an HA or DR solution *DATABASE protection DATABASE MIRRORING
- 24. involves sending streams of active transaction log records to and applying them on the mirror server DATABASE MIRRORING
- 25. operates on the physical layer (transaction log) DATABASE MIRRORING
- 26. operating modes high safety (synchronous) DATABASE MIRRORING
- 27. operating modes high performance (asynchronous) DATABASE MIRRORING
- 28. role switching automatic (requires a witness) DATABASE MIRRORING
- 30. failover clusteringhow it works
- 32. stop service
- 34. stop service wait service start service
- 35. Public Shared Storage failover clusteringhow it works
- 37. Public Shared Storage failover clusteringhow it works AD/DNS
- 38. WHYdo we even care
- 39. domain and DNS administrators we need to speak to the
- 40. SQL Server 2012 Availability Groups Failover Clustering Database Mirroring +
- 41. let’s talk about Availability Groups in the context of failover clustering
- 42. Node a server that is a member of a cluster
- 43. Node a server that is a member of a cluster
- 44. Resource a hardware, service or an entity that is hosted on a cluster basic building block in a cluster
- 46. storage
- 48. server nodes
- 50. virtual resourcevirtual server name virtual IP address virtual computer object Resource
- 51. virtual resourcevirtual server name virtual IP address virtual computer object Resource
- 52. a combination of resources that are managed as a UNIT Group Resource
- 54. Group Resource
- 55. Group Resource
- 56. Group Resource
- 57. moving a clustered resource from one node to another Failover
- 58. reliance of a resource on another resource Dependencies
- 59. *the minimum number of members of a deliberative assembly necessary to conduct the business of that group Quorum
- 66. Next Steps
- 67. Q & AQuestions