> Yes, in this case EVENTS also would be good solution for the problem.
> Polling the database in predifined intervals is a very resource-killing
> method.

Events also are rather expensive. If I were the topic-starter, I
would switch changed data delivery from pull-method to push-method. Let
application that change data inform others about new data. In this case
they won't have to query unchanged data from database.

SY, SD.