It includes support for multiple database systems, with the ability to add additional systems.

它支持多数据库系统，添加辅助系统的能力。

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Some relational database management systems do not allow the registration of multiple databases per instance.

有些关系数据库管理系统不允许每个实例注册多个数据库。

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Applications may instead require a transactional approach where devices submit transactions that update multiple backend systems instead of a single database.

应用程序可能需要事务化方法，其中设备将提交更新多个后端系统(而不是单个数据库)的事务。

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