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What are basic availability groups SQL Server 2016?
A basic availability group supports a failover environment for a single database. It is created and managed much like traditional (advanced) Always On Availability Groups (SQL Server) with Enterprise Edition. The differences and limitations of basic availability groups are summarized in this document.
What is availability group listener in SQL Server 2012?
An availability group listener is a virtual network name (VNN) that clients can connect to in order to access a database in a primary or secondary replica of an Always On availability group. A listener allows a client to connect to a replica without having to know the physical instance name of the SQL Server.
How do I set up AlwaysOn availability Groups in SQL 2016?
Open SQL Server Management Studio and connect to the SQL Server instance. Expand the Always On High Availability folder in the Object Explorer. Right-click on the Availability Groups folder and select the New Availability Group Wizard… option launching the New Availability Group Wizard.
What does always on availability groups in SQL Server mean?
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.
How many databases can a availability group support?
An availability group supports a set of read-write primary databases and one to eight sets of corresponding secondary databases. Optionally, secondary databases can be made available for read-only access and/or some backup operations.
How many replicas does an availability group support?
Each availability group supports one primary replica and up to eight secondary replicas. For more information, see Overview of Always On Availability Groups (SQL Server). Each availability replica must reside on a different node of a single Windows Server Failover Clustering (WSFC) cluster.
What are the different types of availability groups?
An instantiation of an availability group that is hosted by a specific instance of SQL Server and maintains a local copy of each availability database that belongs to the availability group. Two types of availability replicas exist: a single primary replica and one to eight secondary replicas.