存在预设 meaning in English

existential presupposition

There is no pre - configured limit to the number of notification services instances you can run on a server , or the number of notification services databases you can have in a single instance of the sql server database engine
对于可以在一台服务器上运行的notification services实例数和单个sql server数据库引擎实例中可以包含的notification services数据库数，不存在预设的限制。