1. 04 | Always On High Availability
Graeme Malcolm | Data Technology Specialist, Content Master
Pete Harris | Learning Product Planner, Microsoft

2. Module Overview AlwaysOn Technologies
AlwaysOn Failover Cluster Instances
AlwaysOn Availability Groups

3. AlwaysOn Technologies
Windows Server Failover Cluster
AlwaysOn Failover Cluster Instance
Server-level protection
AlwaysOn Availability Group
Database-level protection
Windows Server Failover Cluster

4. AlwaysOn Failover Cluster Instances
Instance-level high availability
Improved health monitoring and failover flexibility
Support for multi-subnet clustering
Support for Cluster Shared Volumes
Cluster Metadata in Dynamic Management Views
Windows Server Failover Cluster

5. AlwaysOn Availability Groups
Replacement for Database Mirroring
(deprecated in SQL Server 2012)
Built on Windows Server Failover Cluster
One primary replica, multiple secondary replicas
Secondary replicas can be readable
Synchronous and asynchronous commit modes
Single listener endpoint for clients
Windows Server Failover Cluster
Primary Replica
Secondary Replica
Sync
Async
Listener

6. Demo: Creating an Availability Group
In this demonstration, you will see how to:
Verify Cluster and AlwaysOn Configuration
Prepare a Database for Inclusion in an Availability Group
Create an AlwaysOn Availability Group
View Availability Group Information

7. Active Secondary Replicas
Secondary connection types:
No connections
Read-Intent connections only
Any connection (but only reads are supported)
Clients connect to secondary replicas via the listener (using read-only routing) or direct
Use secondary replicas for backup
Log backups
Copy-only backups
Primary Replica
Secondary Replica
ApplicationIntent=ReadOnly
Backup

8. Demo: Using an Availability Group
In this demonstration, you will see how to:
Connect to an AlwaysOn Availability Group
Use an Active Secondary Replica
Open a Read-Intent Connection

9. Managing an Availability Group
Always On Availability Group Dashboard:
View health events
View cluster quorum information
Perform a manual failover
SQL Server Management Studio
Add or remove a database.
Adding or removing a replica.
Add or remove a listener.
Configure replica synchronization
Configure active secondary replicas
Configure availability group backup preferences
PowerShell:
Configure read-only routing

10. Managing Failover In this demonstration, you will see how to:
Perform a Manual Failover
Observe Automatic Failover

11. Module Summary AlwaysOn Failover Cluster Instances provide
redundancy at the server level
AlwaysOn Availability Groups provide redundancy at the database level
Replacement for database mirroring
Built on Windows Failover Cluster service