The passive SQL Server instance does not serve SQL Server data to clients or run active SQL Server workloads. It is only used to synchronize with the primary server and otherwise maintain the passive database in a warm standby state. If it is serving data, such as reports to clients running active SQL Server workloads, or performing any work other than what is specified in the product terms, it must be a paid licensed SQL Server instance. The following activity is permitted on the secondary instance: database consistency checks or CheckDB, full backups, transaction log backups, and monitoring resource usage data. You may also run the primary and corresponding disaster recovery instance simultaneously for brief periods of disaster recovery testing every 90 days.
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