Database Mirroring: Interoperability and Coexistence (SQL Server)
SQL Server 2012
Database mirroring can be used with the following features or components of SQL Server:
Database mirroring does not interoperate with the following:
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Cross-database transactions/distributed transactions
For information about why such transactions are not supported, see Cross-Database Transactions Not Supported For Database Mirroring or AlwaysOn Availability Groups (SQL Server).
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AlwaysOn Availability Groups