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Reducing Loss of Connectivity when Recreating an Availability Group
When you drop an availability group, the listener resource is also dropped and interrupts application connectivity to the availability databases. To minimize application downtime, use one of the...
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How to enable TDE Encryption on a database in an Availability Group
By default, the Add Database Wizard and New Availability Group Wizard for AlwaysOn Availability Groups do not support databases that are already encrypted: see Encrypted Databases with AlwaysOn...
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Setting up Replication on a database that is part of an AlwaysOn Availability...
This blog post gives detailed steps on setting up Transactional replication on a database that is part of an AlwaysOn availability Group. The below technet article lists the same with T-SQL...
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Issue: Replica Unexpectedly Dropped in Availability Group
You have deployed AlwaysOn availability groups and observe that one of the replicas unexpectedly disappears from your availability group. In addition to replica loss, there may be issues with the...
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How to map logins or use contained SQL database user to connect to other...
Assume a working AlwaysOn environment with an availability group. Suppose this availability group is failed over to another replica. When the application re-connects to the (new primary) replica with...
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SQL Server manages Preferred and Possible Owner Properties for AlwaysOn...
As a clustered resource, the availability group clustered resource/role have configurable cluster properties, like possible owners and preferred owners. SQL Server actively manages these resource...
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Manual Failover of Availability Group to Disaster Recovery site in Multi-Site...
Setting up an Always On availability group in a multi-site cluster for disaster recovery (DR) scenario is a common practice. A common configuration is two nodes in the cluster at the primary data...
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Create Listener Fails with Message 'The WSFC cluster could not bring the...
One of the most common configuration issues customers encounter is availability group listener creation. When creating an availability group listener in SQL Server, you might encounter the following...
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Use ReadIntent Routing with Azure AlwaysOn Availability Group Listener
The AlwaysOn availability group listener is supported in Windows Azure virtual machines (VMs), but requires unique configuration steps. For more information on deploying an AlwaysOn availability group...
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Create Azure Listener fails with "Unable to save property changes for The...
SymptomWhen creating a listener for an availability group hosted in Windows Azure virtual machines, the following error may occur.Unable to save property changes for <cluster resource name> The...
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IaaS with SQL AlwaysOn - Tuning Failover Cluster Network Thresholds
SymptomWhen running Windows Failover Clustering in IaaS with SQL Server AlwaysOn, changing the cluster setting to a more relaxed monitoring state is recommended. Cluster settings out of the box are...
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Connection Timeouts in Multi-subnet Availability Group
THE DEFINITIONOne of the issues that generates a lot of call volume we see on the AlwaysOn team is dealing with connectivity issues to the availability group listener in multi-subnet environments.A...
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Recommendations and Best Practices When Deploying SQL Server AlwaysOn...
IntroductionMicrosoft Azure virtual machines (VMs) with SQL Server can help lower the cost of a high availability and disaster recovery (HADR) database solution. Most SQL Server HADR solutions are...
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Enhance AlwaysOn Failover Policy to Test SQL Server Responsiveness
The AlwaysOn failover policy for AlwaysOn availability groups monitors the health of the SQL Server process hosting the primary replica. For example, one health check mechanism ensures that SQL Server...
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Determine Availability Group Synchronization State, Minimize Data Loss When...
When Windows Cluster quorum is lost either due to a short term network issue, or a disaster causes long term down time for the server that hosted your primary replica, and forcing quorum is required in...
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Troubleshooting the Add Azure Replica Wizard in SQL Server 2014
SQL Server 2014 introduced a new feature that automates the creation of a new AlwaysOn replica hosted in Microsoft Azure. This replica is added to an existing availability group in your environment and...
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Large Transaction Interrupted by Failover, Secondary Database Reports REVERTING
If a large transaction in an availability database on the primary replica is interrupted by a failover of the availability group, once failover has occurred, the database state on your secondary (old...
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Diagnose Unexpected Failover or Availability Group in RESOLVING State
AlwaysOn availability groups use Windows Cluster to 1) detect the health of the SQL Server process that hosts the primary replica, and 2) to fail over the availability group resource, if configured to...
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Troubleshooting REDO queue build-up (data latency issues) on AlwaysOn...
PROBLEMYou have confirmed excessive build up of REDO queue on an AlwaysOn Availability Group secondary replica by one of the following methods:Querying sys.dm_hadr_database_replica_states and observing...
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How to add a TDE encrypted database to an Availability Group
By default, the Add Database Wizard and New Availability Group Wizard for AlwaysOn Availability Groups do not support databases that are already encrypted: see Encrypted Databases with AlwaysOn...
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