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Fundamentals of SQL Server 2012 Availability groups
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
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- 6. there’s just ONEproblem
- 9. everyone has aright to SIMPLICITY
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- 13. I can’t blamethem I felt the same way
- 14. I have tobe intimidated
- 15. I have tobe intimidated I actually know a few things
- 16. the complex is tostart with what we already know the SECRET to understanding
- 17. SQL Server 2012 AvailabilityGroups is NOT a new technology
- 18. SQL Server 2012 AvailabilityGroups Failover Clustering Database Mirroring +
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- 20. MirrorPrincipal WitnessApplication SQL Server SQLServer 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 SQLServer 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
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- 23. can either bean HA or DR solution *DATABASE protection DATABASE MIRRORING
- 24. involves sending streamsof active transaction log records to and applying them on the mirror server DATABASE MIRRORING
- 25. operates on thephysical 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 (requiresa witness) DATABASE MIRRORING
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- 37. Public Shared Storage failover clusteringhowit works AD/DNS
- 38. WHYdo we evencare
- 39. domain and DNS administrators weneed to speak to the
- 40. SQL Server 2012 AvailabilityGroups Failover Clustering Database Mirroring +
- 41. let’s talk aboutAvailability Groups in the context of failover clustering
- 42. Node a server thatis a member of a cluster
- 43. Node a server thatis a member of a cluster
- 44. Resource a hardware, serviceor an entity that is hosted on a cluster basic building block in a cluster
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- 50. virtual resourcevirtual servername virtual IP address virtual computer object Resource
- 51. virtual resourcevirtual servername virtual IP address virtual computer object Resource
- 52. a combination ofresources that are managed as a UNIT Group Resource
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- 57. moving a clustered resourcefrom one node to another Failover
- 58. reliance of aresource on another resource Dependencies
- 59. *the minimum numberof members of a deliberative assembly necessary to conduct the business of that group Quorum
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