What are the restrictions on availability groups?

What limitations exist for basic availability groups?

Basic availability groups include the following limitations:Limit of two replicas (primary and secondary). ... No read access on secondary replica.No backups on secondary replica.No integrity checks on secondary replicas.

What are the minimum requirements of a database to be part of the Always On availability Group?

For each SQL Server Always On Availability Group (AAG) you'll also need: 1 port number for the listener. 1 endpoint port number (the default is 5022) A share folder in which the SQL engine service account has read/write permissions (used to initialise the replication when adding a database in an Always On AG)

How do availability groups work?

An availability group supports a failover environment for a discrete set of user databases, known as availability databases, that fail over together. An availability group supports a set of read-write primary databases and one to eight sets of corresponding secondary databases.

How many Always On availability Groups can be configured in always on?

You can have more than one AlwaysOn Availability Group on your instance, but databases cannot belong to more than one group. Not configured for database mirroring.