What is always on in SQL Server 2016?

SQL Server 2016 Always On Availability Group with Direct Seeding. SQL Server Always On Availability Groups are an enterprise-level high-availability and disaster-recovery feature introduced the first time in SQL Server 2012as an alternative to database mirroring.

Considering this, what is SQL Server Always On?

SQL Server AlwaysOn provides a high-availability and Disaster-recovery solution for SQL Server 2012. It makes use of existing SQL Server features, particularly Failover Clustering, and provides new capabilities such as availability groups. It aims to provide more granular control to achieve High Availability.

Subsequently, question is, what is always on database? The Always On availability groups feature is a high-availability and disaster-recovery solution that provides an enterprise-level alternative to database mirroring. Introduced in SQL Server 2012 (11. x), Always On availability groups maximizes the availability of a set of user databases for an enterprise.

In this regard, what is the difference between clustering and AlwaysOn?

The main difference is that a clustered instance has the same binaries installed and configured on two or mode cluster nodes (physical or virtual machines) and the database files are sitting on a shared disk. With Availability Groups, two or more copies of the same database are synchronized across multiple nodes.

Can we configure always on without cluster?

Read-Scale availability group in a Clusterless Availability Group. In SQL Server 2017 we can configure clusterless Availability Group in SQL Server without failover cluster configuration on participating replicas. It can be done on both Windows as well as Linux based SQL Servers.

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