Broker & This presents a topic-based pub / sub notification engine. Broker&它表现为一个基于主题的pub/sub通知引擎(NE)。
For each statement that does not meet the requirements for a query notification, the database engine immediately creates a notification. 对于不满足查询通知要求的每个语句,数据库引擎将直接创建通知。
When you request a notification on a command, the database engine registers the notification whether or not the transaction that contains the command commits or rolls back. 对命令请求通知时,无论包含该命令的事务是提交还是回滚,数据库引擎都将注册该通知。