->[!INCLUDE[SQL2016](../../../includes/sssql15-md.md) Service Pack 2 and later provides full support for distributed transactions in availability groups. In [!INCLUDE[SQL2016]](../../../includes/sssql15-md.md)] versions prior to Service Pack 2, cross-database distributed transactions (i.e. transaction using databases on the same SQL Server instance) involving a database in an availability group are not supported. [!INCLUDE[SQL2017](../../../includes/sssqlv14-md.md)] does not have this limitation.
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