Licensing SQL Server of High Availability
In SQL Server 2014, two or more servers can be configured in a high availability mode, such that if one server fails, its processing will be picked up, recovered, and continued by another server. SQL Server 2014 offers the following types of failover support:
Database mirroring
Two-node Failover clustering
AlwaysOn Availability Groups
Log shipping
If your environment uses an active/passive configuration ...
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