When I tried to create a new Availability Group in SQLServer Management Studio, I saw that “New Availability Group Wizard” is grayedout and I am not able to proceed further to configure Availability Group. What couldbe the reason for this?
Q1: Why we need to establish a High Availability and Disaster Recovery Plan in large companies?
Being interviewed for a SQL Server Database Administrator position, and now interviewing candidates for that role, questions related to the High Availability and Disaster Recovery solutions in SQL Server take the large weight of the overall interview questions, as it reflects your advanced knowledge and experience in the SQL Server administration field.
This is due to the fact that Always On Availability Group feature works based on having dedicated storage for each replica without having shared storage between the replicas.
No failover process will be performed in case of any database issue, such as data loss or database corruption, unless the Database Level Health Detection feature is enabled.
But in the Always On Availability Groups, each node will have its own resources, with no resource sharing concept
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Can we configure Availability Groups withoutconfiguring Availability Group Listeners?
Answer- Yes, we can configure an Availability Group without configuring listeners. Listeners are configured to make databases connections irrespective of their replica status.
Can you explain Availability Group Listeners?
Answer – The Availability Group Listener is a virtual network name that we use to make connections to the databases whether it is running from a primary replica or secondary replica after failover.
Can we add a new database to an existing AvailabilityGroup?
Answer – We can easily add new databases to an existing Availability Group. First, we need to prepare the secondary database by taking the full backup and subsequent transaction log backup then restore it on the secondary replicas in no recovery mode. Then we can right click on Availability Group name to launch the Add Database wizard. We should follow all required steps to proceed with this wizard. Once completed, your new database will be added to the identified Availability Group. You can read this whole process in detail in this article: How to Add New Database to Existing Availability Group?
What is the difference between AlwaysOn Failover ClusterInstances and AlwaysOn Availability Groups (AOAG)?
Answer – Please have a look at the main differences between both AlwaysOn solutions: